bluuebunny/crossref_metadata_2025 huggingface dataset:
Analyzing on Bearing Performance Influence Factors of Step Cross-Section Pipe Pile
Authors: Liu Jie , Huang Fu An , Yang Qing Guang , Cui Bin
Published: March 2015

In order to improve the bearing behavior and the bearing capacity of single pipe pile, the technology of step cross-section pipe-pile is proposed.Based on FLAC3D, the finite difference model of the pile-soil interaction established,bearing behaviors of step cross-section pipe pile and unimate cross-section pipe pile is studied comparatively and bearing performance influence factors of step cross-section pipe pile is discussed.The results show that the bearing capacity of step cross-section pipe pile is much higher than unimate cross-section pipe pile in the same geological conditions and material dosage. For layered foundation, the bearing capacity of single pile may be improved by setting variable cross-section pile joint in relatively hard soil. But the depth of joint embedded in hard soil has little influence on bearing capacity of single pile.There is an obvious effect on increasing capacity of single pile by improving soil properties of soft soil surrounding pile.
Application of Water-Proof Curtain with High-Pressure Injection Concrete Piles in Foundation Pit
Authors: Gao Quan Chen , Yang Zhuo , Wang Hong Bo , Fu Han Lu , Zhou Rong Bin , Feng Da Chong
Published: March 2015

This paper introduces a design program for supporting of deep foundation pit through the actual example for Beijing Moisten the world Center project to solve the difficulties of high water content in foundation soil, sensitiveness to surroundings, and difficult control of quick sand and flowing mud in the process of supporting of foundation pit. This program adopts a supporting system with upper soil nailing wall and lower pre-stressed anchor pile and a comprehensive water-proof curtain (Retaining piles + Long spiral high pressure jet grouting & mixing piles) to effectively solve the above difficulties. It is indicated through actual monitoring that displacement and settlement of foundation pit meet the specification and design requirements with excellent water-proof effect. The successful application of this program provides a reference for foundation pit engineering with rich underground water, especially for engineering at hard soil layer and stratum with sand and gravel that are apt to the formation of cement-soil grouting and mixing piles, as well as engineering with limitation on dewatering of foundation pit.
Comparative Analysis of Overburden Strata Movement in Fully Mechanized Top Coal Caving Mining in Entire (Sub) Layer of Ultra Thick Seam
Authors: Wu Yong Ping , Zhang Hao , Xie Pan Shi
Published: March 2015

Reasonable determination of entire layer or sublayer mining method is the key factor of safe and efficient mechanized caving mining of 14.0～28.0m ultra thick seam , numerical simulation on the entire (sub) layer coal caving mining by the FLAC3D , studying the stress and displacement variation of overburden strata , combining the underground pressure theory , comparative analysis on the calculation results . The results show that entire (sub) layer mining roof stress , movement contours are presented in a semi-elliptical arch morphology , indicating the existence of a high arch structure overburden formations , mining process appears roof tensile destruction , but the entire layer caving tensile stress intensity is lower than sublayer caving . When advancing the same distance , entire layer caving puts a greater impact on the overburden strata than the sublayer caving , has some features such as big range of influence and extent , small roof pressure , lead abutment pressure forward from grand , short time of achieving full extraction , etc.
Detection Indicator of Structural Nondestructive Damage Based on Flexibility Curvature Difference Rate
Authors: Xiang Chang Sheng , Zhou Yu , Di Sheng Kui , Wang Li Xian , Cheng Jian Shu
Published: March 2015

Applied to the structural damage identification, Modal Flexibility is better than the Modal Frequency and Modal Displacement, the indicators of Flexibility Curvature are effective and sensitive. This paper proposes a new detection indicator which is Flexibility Curvature Difference Rate (FCDR) that by using the change rate of diagonal elements of flexibility curvature difference when before and after damage. The numerical examples of a simple beam, a continuous beam and a frame with the damage conditions of the different positions and different degrees are used to verify FCDR. The result shows that FCDR can well identify the numerical examples damages, and sensitively diagnose the damage near the supports of beam and the nodes of framework.
Determination of Parameter in SYS Cam-Clay Model of Ultra-Soft Clay
Authors: Xu Bin Bin , Noda Toshihiro
Published: March 2015

Parameter analyses in the constitutive model determine the precision of numerical results. Cam-clay model is the first elasto-plastic model in the world and widely used in the practical engineering. SYS Cam-clay model is proposed based on Cam-clay model by incorporating the concept of overconsolidation, soil structure and anisotropy. There are two groups of parameters in this model, elasto-plastic parameters that are exactly same as those in Cam-clay model and evolutional parameters that decide the variation of overconsolidation, soil structure and anisotropy. The detailed process to determine the parameters is introduced step by step.
Distribution Characteristics and Influence Factors of Soil Arching Ring behind Stabilizing Piles
Authors: Shen Yong Jiang , Yang Ming , Cui Hai Hao , Xiang Zheng Liang , Li Yao Zhuang , Wen Kang
Published: March 2015

Soil arch plays an important role in the landslides reinforced by stabilizing piles . A method was presented to determine the range of soil arching ring. The method proposed was achieved by finite element program and the stress distribution of soil arch with different landslide thrust was analyzed. The results show that the thickness of soil arching ring is variable. The mid-span section of soil arching ring is the minimum. The arch ring becomes thicker from the mid-span axis to the arch feet. With the increase of landslide thrust, the soil arching ring becomes thicker and thicker. At last ,the monitoring data of a model test is studied and the results are consistent with that of numerical simulation.
Evaluation of Pile Application for Slopes on Bedrock Stability
Authors: Bakri Mudthir , Xia Yuan You , Chen Chun Shu , Wang Hua Bin
Published: March 2015

This paper presents a numerical study that performs the stability of slopes on bedrock reinforced with single pile row at different locations. The slope is formed of top sliding soil layer that underlies over rock. The numerical analysis has been implemented by employing the three dimensional analysis using FLAC3D. The results indicate that as the pile location is moved towards the slope crest the displacement increases.In the single row of pile application, the factor of safety reached its maximum value when the pile located at the top middle of the slope. Considering the failure mode the results has conclude three failure modes; above, in front, and through the pile according to the location of the pile. Failure mode is also affected by socketed length of pile in bedrock layer. It is believed that the findings of this study contribute to the engineers performing slope stability analysis in practice.
Experimental Research on Engineering Properties of Natural Coarse Saline Soil as the Subgrade Filler
Authors: Zhang Qiu Mei , Tang Jin Tao , Deng Hong Bin
Published: March 2015

Bases on the project of typical natural coarse saline soil area ,Startis from the saline soil salt expansion characteristics of seven cycles of freeze-thaw cycling test and saline soil subgrade model test ,concluses not only the oil can make roadbed fillers for highway and first-class highway directily , but provides experiences for saline land area of natural coarse particles of high highway designs and construction engineering. Meanwhile, this paper also provides reference experiences for the design and construction of high level road engineering at natural coarse saline soil regions.
Experimental Study of Remoulded Soil Properties Based on Freezing and Thawing Cycle
Authors: Li Jing , Jiang Zhi Nan , Li Jun Wei
Published: March 2015

The experiments were carried out on the remolded soil to study the change law of the soil properties with the numbers of freezing and thawing cycles. It aims at simulating the effect of natural environmental factors on the mechanical performances artificial filling roadbed in Songbei region. After the soil sample was compacted in the optimum moisture content, and undergone limited numbers of freezing and thawing cycles, physical and mechanical properties were measured respectively. The experimental results indicated distinct change trend on physical and mechanical properties of soil after limited numbers of freeze-thaw cycle to confirm that the fillings was susceptible of temperature and moisture in this region.
Experimental Study on Strength Characteristics of Lime - Basalt Fiber Reinforced Expansive Soil
Authors: Zhuang Xin Shan , Yu Xiao Yan
Published: March 2015

Expansive soil of Nanyang Province in this experiment was as the research object and the different lime-mixed rates and basalt fiber-mixed rates on the strength characteristics of expansive soil were studied. The test results show that the maximum dry density and plasticity index of reinforced expansive soil were decreased along with the increased lime-mixed rates and the optimum water content was increased in the wake of the increased lime-mixed rates under the same compaction effort; unconfined compressive strength would be a peak along with the increased lime-mixed rates, ductility of reinforced expansive soil was enhanced by the basalt fiber; expansibility of reinforced expansive soil was slashed by lime and basalt fiber which was the dominant factor.
Geotechnical Properties of Clayed Soils in Mixed Marine and Terrestrial Deposit
Authors: Liu Yan Hua
Published: March 2015

Cohesive soils of the mixed marine and terrestrial sediment are deposited along the north side of the Yangtze River estuary of China. The natural deposit has poor physical properties, with natural water content close to or greater than the liquid limit and the void ratio close to or greater than one. These properties are similar to those of natural soft marine clays, while the former has much higher in-situ shear strength and sensitivity. To investigate the reason for the abnormal combination between the poor physical properties and the relatively good mechanical characteristics, a series of field and laboratory tests were performed on the natural mixed deposit. The results of oedometer tests and corresponding micro-structural tests under different consolidation stresses indicate that the natural mixed deposit is normally consolidated and are structured. There is a good uniformity between micro-structural change and macro-mechanical properties. It is found that the existence of structure is an essential factor, which causes the good mechanical behavior of the natural mixed deposit. The unique sedimentary environment and depositional texture of the natural cohesive soils are the direct reason that has resulted in the abnormal combination between the bad physical indexes and good mechanical characteristics.
Influence on Stress and Strain of High Embankment Dams Caused by Different Reservoir Filling Path
Authors: Huang Zhi Quan , Huang Xiang Chun , Jia Jing Chao , Tao Jia Hui
Published: March 2015

For computing the stress and strain of embankment dams, FEM is employed. Two reservoir filling paths which are constructing filling and completed filling are considered to affect the computing results. It is proved that constructing filling path can enhance the stress of embankment dams. So constructing filling path can take from the hydraulic fracturing of core wall. In addition, constructing filling path can decrease the amount of settlement, and can control the displacement of dam shoulders. In a word, constructing filling path is prior to completed filling path.
Load Conversion on Inclined Plane Foundation
Authors: Man Yin , Zheng Wei Feng
Published: March 2015

According to the mechanics characteristics of inclined plane foundations in transmission line project, rotary theories of spatial coordinate system were used. Load conversion method on inclined plane foundation is analyzed and obtained to get normal section bearing capacity of the column. Meanwhile, the derivation steps and calculation formulas are shown.
Mawei to Jiaou Highway Karst Subgrade Survey and Comprehensive Evaluation Technology Research
Authors: Chen Hua Xing
Published: March 2015

The highway from Mawei to Jiaou is the basic project of West transportation construction projects, "karst areas Highway Engineering Geological Survey and comprehensive evaluation technology research " , the project considering the interaction between road construction and karst environmentwith "karst environment investigation, evaluation, utilization, treatment and protection "for the macro-technology concepts , fully learn from the advanced research results at home and abroad, and actively absorb sophisticated engineering experience, through theoretical analysis, numerical simulation, model test, laboratory test, relying on engineering verification and other technical means , do the research on karst area highway construction technology .
Discussion about the Development Principles of Reinforced Location Test Instrument Calibration Components
Authors: Ren Zheng Yue , Huang He , Liu Lu , Liu Jing
Published: March 2015

The calibration of the concrete-rebar detection system use the calibration components made by the various metrological verification units commonly,and the value cannot be traced back.In this paper, the development principles of the calibration components is analyzed systematic. The position of the reinforced bar on the influence of the result of the test was tested by using the HC - GY61 reinforced location tester,from which come to a conclusion of the design reference of Φ12,Φ16,Φ20 and Φ25 while the value error is in ±1mm and 0mm,which also can provide a reference for industries developed calibration components.
Numerical Study of Unsaturated Expansive Soil Canal Slope Covered by Geo-Membrane
Authors: Wu Wen Qing , Chen Jiang Hu , Zhang Hong Yu , Wu Jun Hua
Published: March 2015

In view of the holes appearing in different areas of geo-membrane when the geo-membrane technology is applied to the unsaturated expansive soil canal slope, the VADOSE/W is used to analyze the pore-water pressure of the internal canal slope by changing the falling water level. The results show that the hole is nearer to the toe of slope, its effect on the whole seepage field is greater. The greater the rate is, the soil water content is greater.
Research on Construction Technology of Embankment Widening of Waterside Cantilever High Retaining Wall
Authors: Wang Xin Quan , Cui Yun Liang , Zhang Shi Min , Qin Jian , Zhou Zhong Jian
Published: March 2015

In the project of the fill section widening of the cantilever high retaining wall of the old embankment, the construction of the embankment widening is carried out under the condition of allowing cars to drive through. As the stability of the old embankment and the normal and safe car driving shall be guaranteed, the cantilever reinforcement high retaining wall can’t be dismantled once for all or completely during the widening process, and the conventional construction of excavating the steps for joining the new and old embankments. This paper aims to solve the defects of the conventional construction method by introducing a newly-developed construction technology of embankment widening of waterside cantilever high retaining wall, which can effectively solve the anti-floating problem of the light-weight embankment, prevent the differential deformation at the joint of the wall bottom plate and the reinforced concrete continuous slab of the cantilever retaining wall, and improve the bearing capacity of the embankment.
Research on Integrative Construction Technology of Pile Peripheral Cemented Soil Reinforced Cast In Situ Concrete Stiffness Core Pile
Authors: Wang Xin Quan , Cui Yun Liang , Liang Jian Feng , Zhang Shi Min , Wu Hai Gen , Wu Xiao Bin
Published: March 2015

the construction method of the ordinary cemented soil stiffness core composite pile is that the pile peripheral cemented soil and the core pile are constructed at different time, which might lead to the situations as the pile body is broken due to the forced inserting of the core pile into the cemented soil mixed pile after the initial setting time, the neighboring finished pile is damaged due to the compacting effect caused by the reaming construction of the core pile and the failure of effectively transferring the load due to the loose joining of stiffness core pile and the cemented soil whose construction is completed after the initial setting time. This paper aims to overcome the defects of the conventional construction method by introducing a new construction technology, and the construction technology is verified to be reliable through the application in the actual engineering projects and has the advantages that the peripheral soil body is significantly strengthened, the composite pile foundation can effectively overcome the harm as uneven settlement of buildings, so as to ensure the normal usage of the buildings, and the construction technology has excellent economic benefits and is significant for the later construction technology for treating the soft soil foundation.
Research on the Large Size Loading Plate Test of Underwater Sand Compaction Pile Composite Foundation
Authors: Hou Jin Fang , Yu Jian , Xu Xin Wei
Published: March 2015

Large size loading plate test for sand compaction pile composite foundations with the replacement ratio being up to 60% was carried out to study the deformation and bearing capacity of the sand compaction pile composite foundation. The test was carried out for 53 days with anchor pile, square loading with the side length of 5.4m, 15m-deep water and twice circulation loading mode. The compression deformation, pile-soil stress ratio and deformation modulus of the sand compaction pile composite foundation was analyzed through load test. Test results indicated that, the ultimate bearing capacity of the sand compaction pile composite foundation in this test was larger than 340kPa; sand compaction pile had a drainage consolidation effect on the soft soil between piles; under the load-keeping condition, sand compaction pile composite foundation would also has settlement; pile-soil stress ratio was 6.3 and deformation modulus was about 8kPa. The success of the test may provide experience and reference for load test of underwater sand compaction pile composite foundation carried out at open sea.
Simulation of Excavation Process for Deep Foundation Pit Base on Nonlinear Finite Element Theory
Authors: Wang Hui Min , Ji Zhen Jian , Cao Liang , Yao Ji , Qian Shan Guang
Published: March 2015

Deep Pit is the main content of modern urban geotechnical engineering. In this paper, based on a deep foundation pit engineering as an example, based on the nonlinear finite element theory, conduct a numerical simulation research for foundation pit excavation process. Obtained the distribution law of pit deformation, stress distribution and the supporting structure of the internal forces, under the various processes. These provide a theoretical basis for safety evaluation of foundation pit engineering.
Study of Thermal Stress of Steel Slag Foundation
Authors: Wang Tao
Published: March 2015

Building on the foundation with steel slag as a typical example of the destruction of the thermo-elastic theory to study slag landfill foundation, combining academic knowledge mechanics, heat transfer, etc., the theoretical foundation of slag analysis and numerical simulation of thermal stress, a comprehensive discussion the failure mechanism of the upper part of the foundation of the slag building. On-site measured temperature were fitted by thermal stress analysis of steel slag field, get the corresponding stress-strain cloud. The results show close to the simulation results and the actual situation: simulating thermal stress results slag surface be uplifted 3.77cm, uplifting 5cm of building fundamentals actual.
Study on the Effect of Admixtures on the Strength of Stabilized Sludge Soils
Authors: An Kai Xi , Chen Yi Xiang , Lou Ruo Qi , Wu Min Jiong
Published: March 2015

In order to reveal the effect of admixture type and quantity on the strength of stabilized soil, a series of indoor test is done on the stabilized soil by means of unconfined compressive strength test. The raw material soil used in the experiment is sludge soil, and cement, triethanolamine, caustic soda are used as admixture. A lot of solidified samples are prepared according to test scheme in different admixture’s proportion. From the test results, it can be seen that different admixture and it’s quantity affect the strength of stabilized soil by analyzing the sample’s unconfined compressive strength test results.
Study on the Strength Characteristics of Sludge Solidification
Authors: Chen Yi Xiang , An Kai Xi , Zhou Ke Xin , Xu Chen Hao
Published: March 2015

In order to reveal the effect of type of admixture and its content on the strength of stabilized soil, this paper uses the sludge as raw soil and cement, fly ash as curing agent, and analyzes the strength characteristics of samples mixed stabilized according to certain content. Using the unconfined compressive strength test, the compressive strength of the samples is tested. The effect of curing agent type and its content on the compressive strength is investigated. From the experimental results, it can be seen that the content of cement and fly ash has much effect on the strength. The conclusions obtained can have some conference values on the foundation treatment and reuse of waste resources utilization.
Subgrade Design and Construction Technology for Saline Soil Area
Authors: Song Bi Hong , Han Cong , Chen Jian Hua , Shan Xue Li , Wang Chun Yan
Published: March 2015

The design scheme and engineering construction technology are proposed for an accommodation highway subgrade on the basis of forming reasons and hazard analysis of saline soil in Xinjiang region. In the design, major measures adopted include basement replacement, setting aeolian sand layer and composite geotextile layer, strengthening the subgrade waterproofing and drainage, antiseptic treatment of structures, etc. This paper introduces the subgrade design and construction technology, of which the implementation and application on the test section have achieved a favorable effect and can be taken as the basis for design and construction of similar saline soil subgrade.
Dynamic Analysis of Concrete Frame Structure with Story-Adding Steel Structure at the Top
Authors: Sun Xiang Hong , Xie Lie Ping , Ji Feng
Published: March 2015

After steel structure was added on top of a concrete frame structure, the mass, stiffness, natural period and damping ratio of the original frame structure has changed significantly. Using finite element software ANSYS and software PKPM respectively, model of the original frame structure and the new structure with story-adding steel structure were built. Furthermore, seismic performance of the three structures was studied. Weak location of the structure was found out. Finally, the main factors were analyzed. Results show that whiplash effect is not obvious when one-story steel structure was added on the top of the original frame structure. Also, seismic performance of the frame structure with two-story steel structures on the top is perfect. Some suggestions are put forward for designing the similar structure.
The Characteristics and Construction of CFG Pile Composite Foundation
Authors: Cao Su Qing , Yang Mei , Xin Xiao Fei
Published: March 2015

This paper expounded the engineering characteristics and construction technology of CFG pile composite foundation, introduced the construction process of CFG pile and main points for attention, and proved that CFG pile treatment scheme is practical and feasible combined with the engineering practice.
The Shear Dilation and Shear Band of Coarse Grained Soil Based on Discrete Element Method
Authors: Zhang Zhi Hua , Zhang Guo Dong , Li Xue Liang , Xu Zhi Hua
Published: March 2015

Based on the triaxial test of coarse grained soil, using the discrete element method to simulate the biaxial test by using PFC2D as the discrete element method (DEM) tools, and generate particles by a gradation which is similar with that in laboratory. Through self-programming, depends on the macro-reaction in lab to find out the mesoscopic parameters and deformation characteristics of coarse grained soil, then calibrate the value of friction coefficient correspond to that in laboratory, and at last find out the shear bands. The results show that the value of sample volumetric increment ratio (VIR) dεv/dε is positive (shear shrinkage) at first and then negative (shear dilation) when confining stress is 300kPa, when the confining pressure is greater than 300kPa, samples have been on the shear shrinkage.
Trend Surface Analysis Method Applied in Coal Seam Structure in ZhuJiaHe
Authors: Xue Xi Cheng , Wang Zhi Qi
Published: March 2015

Due to the impact of multi-period structure in Zhujiahe coal,Mine structure complicated and Has caused a certain impact on coal mine safety production. article Randomly selected 30 from 170 borehole date in coal mine.This paper analyzes 1, 2, 3 times of trend surface on No. 5-2 coal seam floor elevation.exploring the trend surface analysis method research in mine geological structure regular.
Stress and Strain Analysis of Waste Dam and Stability Analysis of Landfill
Authors: Liang Li Hua , Kuang Su Lin , Diao Zhi Jun
Published: March 2015

Stress and strain of waste dam were analyzed based on the construction design and situations in the field. In situ stress field was calculated according to linear elastic material model and deformation was simulated according to hyperbolic nonlinear plastic model. On the basis of the deformation and stress analysis, dam stability was evaluated according to the deformation by total stress method. The result shows that the stability of the dam can meet the specification requirements and be operated normally even if the deformation occurs when solid waste are heaped up to 0-12 m according to the preliminary design scheme.
Influence Analysis of Dam Stress and Displacement Caused by Stiffness Degradation and Mass Loss
Authors: Zhong Ju Fang , Zhan Luo Long , Liang Jun Wei , Fan Zhi Peng
Published: March 2015

The concrete dam under dead load, water pressure load and wind load is in high stress state for a long time, whose safety is in a dangerous station to a certain extent. The static calculation of the dam was done by ANSYS. In order to know the static characteristics of the dam, and to provide a theoretical basis for dam health diagnosis and routine maintenance, the variation of the dam stress and displacement caused by the stiffness degradation and mass loss was studied. The influence degree of the dam mass loss and stiffness degradation on stress and displacement were discussed. The results show that stress along the dam height (Y direction) is higher than it along the horizontal direction (X direction), the maximum stress difference is to about 4 times. The influence degree of dam stress and displacement caused by stiffness degradation is more serious than those by mass loss.
Dynamic Nonlinear Analysis of Semi-Rigid Steel Frames Based on the Finite Particle Method
Authors: Yu Ying , Jin Lin , Xia Ping
Published: March 2015

The Finite Particle Method (FPM), based on the Vector Mechanics, is a new structural analysis method. This paper explores the possibility of the proposed method being applied in the dynamic nonlinear analysis of semi-rigid steel frames. Taking the two dimensional beam element as an example, the formulations of the FPM to calculate the dynamic and geometric nonlinear problems are derived. Spring model with zero-length is adopted to simulate the relationship between internal forces and deformations of the semi-rigid steel connections. The nonlinear strengthen spring model is used to analyze the nonlinear behavior of the semi-rigid connection. Explicit time integrations are used to solve equilibrium equations. Comparing to traditional Finite Element Method, iterations and special modifications are not needed during the dynamic nonlinear analysis, which is more advantageous in structural complex behavior analysis. Two numerical examples are presented to analyze the behaviors of rigid and semi-rigid steel frames, and behaviors of linear and nonlinear semi-rigid connections, which demonstrate the accuracy and applicability of this method in dynamic nonlinear analysis.
A Comparative Study on the Economic Characteristics of the Extradosed Cable-Stayed Bridge and Cable Stayed Bridge
Authors: Xiong Fei , Chen Cong Chun
Published: March 2015

Aimed at the problem of extradosed cable-stayed bridges economic characteristics,studied extradosed cable-stayed bridges and cable stayed bridges data which has been built in China,statistics, induction, fitting the relation between the consumption of the main materials and the span,clear relationship between the cost and span, indicate that both consistent cost when the main span is 200 m ~ 320 m;Extradosed cable-stayed bridge is cheaper when the main span of less than 200m or more than 320m.
A Parameter Estimation Method for Bridges Based on Field Measured Influence Lines
Authors: Zeng Sen , Ma Xin Wei , Dong Chong Hai , Yan Wei
Published: March 2015

A method for bridge structural parameter identification using field measured static influence lines with respect to various types of measurement is presented. Static test data on displacement, tilts and strains are quantified by means of influence lines to estimate global and local, sensitive and insensitive parameters of any model form of structure. A quadratic performance error function to be minimized was established with interpolation or fitting procedures. An analytical example of a simply supported beam is employed for demonstration purpose. A numerical example of plane stress is presented and local and insensitive parameters are successfully and accurately estimated. Results of the example suggest that despite no competitive advantage in estimating the sensitive parameters with integrative measurement, it is an essential point to the successful identification of insensitive parameters by making a judicious selection of integrative measurement.
Analysis of Solid T-Pier Dynamic Response to Debris Flow
Authors: Xiu Zhen Yu , Zhang Ming Jie , Zhang Chen , Hong Yu
Published: March 2015

In recent years, traffic lines are rapidly thrusting into the hilly regions[1]. It’s not hard to list such cases that bridges have been damaged by mud-rock flow. In this paper, it is studied that the dynamic response of the solid T-pier to mud-rock flow. a finite element method is applied to analyse the effects of the stress and strain of an T-pier under the impact action of mud-rock flow with different velocity.
Bending Behavior of Glass Fiber Grid Reinforced Gussasphalt
Authors: Gao Bo , Wang Min , Hao Zeng Heng
Published: March 2015

In combination with the composite material technology, add the glass fiber grid into gussasphalt deck pavement system to form glass fiber grid reinforced gussasphalt. Analysis shows that adding the grid can increase the bending performance. Three point bending test was did to do verification and results were indicate that glass fiber grid can improve the anti-bending strength and anti-bending strain in high temperature.
Experiment Research on Key Performance Indexes of Synchronous Gravel Water-Proof Adhesive Layer for Bridge Deck Pavement in Seasonal Frozen Region
Authors: Shi Cheng Lin , Liu Han Bing
Published: March 2015

Synchronous gravel water-proof adhesive layer has many advantages, and is widely used to bridge deck pavement. Though the material of synchronous gravel water-proof adhesive layer has high temperature sensitivity, it needs more research that whether this construction can well adapt to seasonal frozen region. Used UTM-100 and self-design testing machine, we tested and analysis the key parameters of the water-proof adhesive layer about SBS nature-changing pitch crushed stones, rubber-asphalt synchronous gravel and high-viscosity asphalt synchronous gravel. Firstly, based on result of core testing under normal temperature, I determined the best mix-proportion for three materials, and tested their shear, tensile strength, deformation performance under different temperature and humidity.
Mechanical Properties of the Section from Steel Tube-Reinforced Concrete Pier
Authors: Wang Zhen , Wang Xiu Xin
Published: March 2015

To research the impact of inner concrete filled steel tubular (CFST) on the reinforced concrete (RC) pier confined by stirrups, a Matlab program based on fiber model was written to calculate the moment-curvature (M-ϕ) relationship. The program was utilized to compute the M-ϕ relationships of three piers with same longitudinal bars and stirrups, and the three piers were an ordinary RC pier confined by stirrups、a high strength reinforced concrete (HSRC) pier confined by stirrups and a steel tube-reinforced concrete (ST-RC) pier respectively. The rules about bearing capacity of section and curvature ductility along with axial load N were deliberated by comparing the numeral results of three piers. The ratio of peak moment Mk to yield moment My was defined as super coefficient λs, and the disciplinarian of λs along with N was discussed. Participation factor ξ referred to the ratio of the moment provided by inner CFST to the total moment of ST-RC pier, and the laws of ξ affected by ϕ and N were researched. The results show that ST-RC pier has higher ductility and higher bearing capacity of section, and ductility decreases more slowly than other piers with the increase of N. λs of ST-RC pier is highest among three piers in most cases. On conditions of different N, ξ shows different variation trend with curvature ϕ up, and the maximum of participation factor ξmax is reckoned to be not affected by N basically.
Reliability Analysis of Pre-Stressed Concrete Continuous Girder Bridges Using Cantilever Construction on Different Codes
Authors: Cui Feng Kun , Luo Xu Chang , Dong Feng Hui
Published: March 2015

The object of this paper analyzes the reliability level of pre-stressed concrete continuous girder bridges designed with the Chinese codes including the code for design of highway reinforced concrete and pre-stressed concrete bridges and culverts of JTG D62-2004 and JTJ 023-85 using cantilever construction method. Typical cross-sections used in the example bridge are considered at service stage. Load and resistance parameters are treated as random variables. The statistical parameters are based on the available literature, test data and survey results. Reliability indices are calculated by iterations using the first-order second-moment method. The calculated results indicate that the reliability indices on the code of D62-2004 vary considerably to the code of JTJ 023-85. And it could provide the references for the reinforcement of old bridges and the design of new bridges using the cantilever construction.
Research in Destruction of Concrete Bridge Expanded Joint Influenced by Temperature Difference
Authors: Lei Xiao , Yao Yue , Cao Shi , Guo Zhi Gang
Published: March 2015

Destruction of bridge expanded joint is a serious problem for concrete bridge. Based on 5 years measured data, the temperature in the different positions of the concrete box girder was systemically analyzed to illuminate the cause of the bridge expanded joint damage. A method for predicting the extremum value of the temperature difference of concrete girder was proposed by use of the extrema analysis and curve fitting based on the temperature in the different positions of the concrete box girder. The relationship is quite useful in estimating the destruction of bridge expanded joint by effective temperature difference in concrete box-girder.
Research of the Control of the Vibration Caused by Human in Long-Span Terminal Aerobridge
Authors: Wang Qian , Zhang Zhi Qiang , Yang Kang , Zhou Chen , Xia Dong Pin
Published: March 2015

In order to control the degree of comfort in vibration caused by human in a steel aerobridge of Shenzhen T3 terminal building, the theory of structural vibration control and TMD (Tuned Mass Damper) was used to control the vibration caused by human and conduct comfort design. At first, 3D analysis model of the structure was developed through general finite element analysis software MIDAS / GEN. And time-history analysis was carried out in different working conditions of human walking or jumping to analyze the dynamic response before and after the TMD was installed. Then, vibration test was conducted in-situ to determine its dynamic property and record its peak acceleration before and after the TMD were installed. Test data was then compared with data from the analysis model of the structure based on analysis software. The results show that the installing of TMD and making adjustment of the stiffness of the TMD based on the actual test make the structure meet requirements of degree of comfort in vibration caused by human. The effect of the vibration control is good.
Research on Reasonable Strengthening Time for Hinged Joints of Hollow Slab Bridges Based on Relative Displacement Method
Authors: Zhou Bin , Cheng Kun , Shen Kun
Published: March 2015

Relative displacement method is considered to be one of the most direct methods used for rapidly and conveniently evaluating the deterioration of hinged joints in fabricated hollow slab bridges. Based on the relative displacement method, a statistical analysis on the results from the measured 265 diseased hinge joints in 11 bridges was conducted in this paper. The status of hinge joints can be classified into four regimes of perfect, micro damage, damage and failure according to a dimensionless damage evaluation index η, whose value was also presented in the paper. Finally, the reasonable strengthening time and strategies for hinged joints and corresponding strengthening strategies were proposed based on the parameter η.
Research on Temperature Effects of the Pre-Stressed Concrete Box Girder Bridge
Authors: Fu Yi Xiang
Published: March 2015

The distribution of the temperature gradient and temperature change of the pre-stressed concrete box girder are extremely complicated because of the multiplex environment. Temperature load has attached great importance in the field of engineering, and it has a great influence on the bridge’s structure, especially the box structure. The engineering background of this paper is a typical three-dimensional pre-stressed concrete continuous box girder bridge with variable cross section, comprising five spans in one continuous unit. Experiment on it and research the change rules of the temperature distribution, as well as the influence of the structure’s internal force resulted by temperature. Finite element software-Midas/FEA is used to model and calculate the bridge in order to analyze the temperature influence on structure’s stress in contrast to the measured data from the experiments
Stress Analysis of Simple-Supported Box Girder Deck Pavement under the Effect of Concrete Cushion
Authors: Wang Hu , Han Fei
Published: March 2015

In order to study the stress distribution law of simply-supported box girder bridge deck pavement under the effect of triangular concrete cushion, finite element analysis program is used to analyze distribution regularity of stress among asphalt and cement concrete cushion at the thinnest thickness of concrete cushion and transverse slope degree under the action of eccentric load which is applied in the most critical position. The result indicates that the first principal stress in asphalt pavement, the interface normal tensile stress and interface shear stress will reduce when the cushion layer thickness and transverse slope degree increase, however, the thinnest thickness of cushion should not be less than 3 cm. Considering the total weight of structure, cushion thickness should not be too large either. The thinnest cushion thickness of simply supported box girder bridge pavement layer is recommended for 3-4cm while transverse slope for 2-3%.
Study on the Effect of Fly Ash Mix Amount in Large Volume Pile Cap Concrete on Heat of Hydration
Authors: Wang Hai Liang , Zhang Xie Dong
Published: March 2015

Contraposed the hydration heat of large volume concrete, based on the introduces of raw material, the effect of fly ash mix amount in large volume pile cap concrete was mainly analyzed combined with project case of Yellow River Bridge in Baotou-Shulinzhao Highway. Moreover the temperature and temperature stress in different mix amounts were analyzed by the finite element software to confirm the appropriate mix amount of fly ash and the mix proportion of concrete. Finally, the consequence of the large volume pile cap temperature control was certified by the practice of construction.
Analysis on the Lateral Creeping of a Curved Concrete Girder Bridge
Authors: Tu Jun , Yi Xiao Wei , Wu Qi Ming , Jiang Rui Juan
Published: March 2015

In recent years, the lateral creeping happened from time to time to the curved concrete girder bridges when they are in service. This attracts much attention in the fields of the design, construction, maintenance of this kind of bridges since severe damage or collapse may happen to the whole structure when the lateral creeping displacement is large enough. In this paper, a comprehensive analysis is carried out on the lateral creeping of a curved two-span continuous concrete girder bridge which has been in service for 20 years to find out the possible reasons. A finite element model is appropriately developed for this example bridge using the commercial software Midas/Civil. Taking into account the dead loads, vehicle loads, thermal loads, etc., the safety and reliability of the original design of this bridge is proved first. And then the analysis is carried out for two possible reasons, bearing failure and expansion joints failure, respectively. The results show that the real reason of the bridge lateral creeping is that the expansion joints are stuck by the concrete blocks left when the expansion joints are replaced.
Research for the Structure System of Curved Wide Extra-Dosed Cable-Stayed Bridge
Authors: Peng Jing Rong , Luo Jin Biao , Mu Jian Gang
Published: March 2015

This paper is based on some curved wide extra-dosed cable-stayed bridge, and the finite element software MIDAS/CIVIL is applied to set up three different system models of semi-floating system, pylon-girder consolidation system and rigid frame system according to the practice engineering background. Compared the internal forces and displacements in three systems under dead load, temperature load and live load, conclusions can be drawn as, the overall stiffness of rigid-frame system is the largest, its deformation is the least under dead load and live load, but it is sensitive to temperature load which can cause large second internal force. According to the overall structure performance of three different systems, it is better understanding their superiority to different application range, which can be a reference for designing in the future.
An Evaluation Method of Structural Redundancy under Earthquake Action
Authors: Zhu Nan Hai , Zhao Xiao Hua , Huang Dong , Zhu Bo
Published: March 2015

Redundancy is an important component of structural robustness. A method is proposed based on the response sensitivity for assessment of the redundancy of structure under earthquake. Redundancy analysis is carried out for a single-layer reticulated dome subjected to earthquake condition. The result shows that the redundancy values are able to reveal the weak links in the structure. Members with a small redundancy are identified as structural weaknesses that are easily damaged under loads, and their failure may cause catastrophic consequences to the structure. Therefore, the members with small redundancies must be treated as key components of the structures.
Influence of Spatial Variability of Seismic Shock on Steel Hall with Experimentally Determined Elasto-Plastic Parameters of Steel Material
Authors: Jasinska Dorota , Dulinska Joanna M. , Boron Pawel
Published: March 2015

In the paper the influence of spatial variability of a seismic shock on an industrial steel hall was examined. Different models of seismic excitation were introduced. Firstly, a uniform seismic excitation model was applied, assuming identical motion of all supports of the hall. Then, a non-uniform excitation model was implemented. In that model subsequent points of the ground in the direction of wave propagation repeat the same motion with a certain time delay dependent on the wave velocity. Two direction of the wave passage were assumed: longitudinal (along the longer side of the hall) and transverse (along the shorter side of the hall). To guarantee proper nonlinear elasto-plastic behavior of the structure, the material parameters of the steel were determined experimentally. The dynamic analyses revealed that the response of the hall to the seismic shock was reported beyond the elastic range. Plastic effects appeared in some zones of the primary as well as the secondary structural members of the object, regardless of the excitation model. The model of non-uniform seismic excitation with transverse wave passage turned out to have the greatest impact on the dynamic response of the hall; the plastic strains obtained for that model were much greater than those obtained for other models. The transverse non-uniform excitation generated irreversible strains almost 3 times greater than the uniform excitation. The evolution of significant plastic effects was observed mainly for non-uniform excitations in the lower parts (girts and columns) of the hall, which were strongly affected by the different motions of the ground.
Seismic Analysis of High Pier Three-Span Continuous Bridge
Authors: Wu Xun , Zhang Yong Lan
Published: March 2015

In this paper, SAP2000 and ANSYS software are used to modeling and analysis athree-span continuous beam bridge with high piers case study.By using differentbearing types and combinations to form different options, create two finiteelement models.Analysis dynamic characteristics ,elastic response spectra,linear time history and nonlinear time history .And focus on comparing dynamiccharacteristics of the earthquake response of the two programs .Running outputdata processing and comparison results show that the application of thedifferent parameters of the rational combination of rubber bearing basin bridgearrangement has better seismic performance.
Seismic Hazard Assessment of Hengshui Area by the Modified Stochastic Finite Fault Modeling
Authors: Liu Bo Yan , Shen Wen Hao , Shi Bao Ping
Published: March 2015

In recent years, numerical simulation of strong ground motion has been well developed with the progress of earthquake science, and it has become an important approach to estimate strong ground motion. In this research, we improve the original program of EXSIM and the modified program named MEXSIM to calculate the Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) which is essential for seismic hazard assessment of Hengshui area. Considering the impact of V30(the average shear-velocity down to 30 m) we calculate the impact of two scenario earthquakes from the rupture processes of Hengshui fault and Qianmotou fault. Comparing to Qianmotou scenario earthquake, if the instability fault is Hengshui fault, the PGA and PGV could be 200-360gal and 20-35cm/s respectively in Hengshui city.
The Dynamic Characteristics Analysis of Liaocheng Guangyue Tower
Authors: Meng Zhao Bo , Cao Yu , Jin Jie
Published: March 2015

Taking Liaocheng Guangyue tower as an example, based on the on-site measurements, to determine its dynamic characteristics and provide a basis by numerical analysis method for determining traffic incentive effect on the ancient timber buildings. From the research, we can conclude that the first-order self-vibration frequency of Guangyue tower can be taken as 1.638Hz, the corresponding natural vibration period is 0.61s,the damping ratio is 1.098.