bluuebunny/crossref_metadata_2025 huggingface dataset:
Inside and Outside Earth Pressure Research of Steel Sheet Pile Cofferdam
Authors: Xiong Bao Lin , Tang Jin Song , Chen Wei
Published: February 2012

As the cofferdam makes the water flow change, the river bed near the cofferdam has been washed; soil pressure on the cofferdam will be changed. In order to better grasp the force of the cofferdam, the earth pressure on the cofferdam need to be monitored. As it is difficult to monitor occasion, the computing earth pressure is necessary. In this paper, three-dimensional finite element model on the steel sheet pile, purlin, internal support and soil can be established. Through compassion computing value of model and monitoring value, conclusions are drawn.
The Analysis of Seepage Characteristics and Stability of Carbonaceous Mudstone Embankment Slope in Rainfall Condition
Authors: Zeng Ling , Fu Hong Yuan , Li Tao , Qin Yan Qi
Published: February 2012

Based on the actual rainfall data and saturated-unsaturated seepage theory, the change of pore water pressure and volumetric moisture content of carbonaceous mudstone embankment slope were studied under designed rainfall intensity. At the same time, the effect of rainfall intensity change on the slope failure mode and safety coefficient was analyzed. The results of the study show that: Continuous rainfall will make the surface layer negative pore water pressure of carbonaceous mudstone embankment slope loss, and in transient saturation zone the volumetric moisture content reaches the saturated moisture content. Safety coefficient of carbonaceous mudstone embankment slope gradually decreases with the rainfall continuing, potential sliding surface also have the tendency of extending into the embankment.
Characteristics of Settlement and Assessment Methods of Engineered Structures under Certain High-Speed Railway Tracks in China
Authors: Xiao Shi Guo , Yan Qing Rong , Chen Wen
Published: February 2012

The assessment of settlement deformation of engineered structures under high-speed railway tracks is an important control link in high-speed railway line construction. This paper discusses characteristics of settlement deformation of sections of subgrade, bridges and tunnels, and analyzes the suitability of predictive methods in currently available technical codes and standards based on measured data of settlement deformation. Currently available assessment analysis methods have good applicability for subgrade sections but are not suitable for sections of bridges and tunnels. Suitable assessment analysis methods are proposed and have been successfully applied to settlement deformation of engineered structures under the tracks of high-speed railway lines. The methods suit the characteristics of “small magnitude and large fluctuation” changes of measured settlement deformations taking account of the construction process of the engineered project.
Strain Softening Behaviors of Clay under Fast Ring Shear Conditions
Authors: Hong Yong , Wang Jun Gang
Published: February 2012

In this study, the strain softening behaviors of an overconsolidated silty clay was studied by a ring shear apparatus. The tested results present some different properties with the traditional shear tests. It was found that the silty clay samples with relatively high shear rates are liable to the occurrence of strain softening. With shear rate increasing, both the peak strengths and the post-peak strength reduction become greater. According to the data of deformation and pore pressure measured during the tests, there are two patterns of causing the strain softening of the silty clay. One is related with the contraction of soil specimens; the other is concerned with the generation of negative pore pressure due to the dilatancy of soil body.
The Application for Reinforced Concrete Piles of Chamber on Soft Foundation Treatment
Authors: Du Yang , Chen Tao , Li Song , Wang Yi
Published: February 2012

This paper explains foundation treatment technique of a sluice in Eastern Liaoning province. Because the chamber is situated at the entrance of the Yellow Sea, under the influence of tides, seawater flow backward yearly. Thus the construction project is an extreme significance to national economy and people's living and environmental protection. Due to its special geographical position bordering the estuary, the foundation soil is complex; silt clay distributes widely, silt clay and fine sand layers staggered. Additionally, seismic intensity is eight degrees, so that it is of no engineering geological significance and is not used directly as a stratum. Therefore, for the soil of the chamber, method of reinforced concrete casting pile for reinforcement is used to meet the different requirements of various working conditions.
Research on Detecting Multi-Passage Leakage in Dam by Temperature in Bores
Authors: Wang Xin Jian , Li Ri Run
Published: February 2012

Multi-passage leakage often occurs in earth-dams, the locations of all seepage passages must be located actually to repair the dams absolutely. Fluxs and temperatures of water in passage and in pore of soil are different, so the special temperature distribution of this kind of dam is formed by heat transfer. Locations of concentrated leakage passages are assumed known. Analysis formula for temperature field of the dam with multi-passage leakage is established by that of the dam with single leakage passage. Coordinate is transformed by model of Bursa–Wolf with six parameters. Finally, the mathematic model for detecting multi-passage concentrated leapage in dam by temperature is put forward. In case, plane model for detecting column passage is established by simplifying conditions.
Experimental Study of Shear Strength of Unsaturated Silty Clay of Yellow River Levee
Authors: Liu Cui Ran , Wang Li , Guo Jin Jun
Published: February 2012

Tri-axial test is one of effective means to measure the strength of unsaturated soil. But because of complexity and exquisite requirement with and long duration of test, unsaturated tri-axial test wasn’t used extensively in civil engineering before. The tests of shear strength of unsaturated soil are performed with the improved tri-axial apparatus for unsaturated soil. According to test data, the relationship of strength between water content and matrix suction are studied. In addition, the new shear strength formula suitable for yellow river is derived. The formula is the theory basis for analysis of unsaturated slope stability.
Non-Linear Finite Element Analysis on Composite Shear Wall with Opening
Authors: Zhu Tie Mei , Ye Yan Hua , Wei Wei , Liu Wei Qing , Wang Zi Jun
Published: February 2012

A new composite structure system is proposed in this paper to suit the demand of building energy conservation and heat preservation. Based on the low reversed cyclic loading test, the non-linear finite element (FEM) analysis model of composite shear wall is established by ANSYS so as to study crack status, stress variation characteristics and failure process under the action of horizontal loading. The results of ANSYS finite element analysis show good agreement with the test results.
Stability Analysis of Steel Pipe with Large Diameter under Radial Pressure during Deep Shaft Construction
Authors: Zhang Ji Zhao
Published: February 2012

With the increase in depth of coal mining, coal mines constructed are constructing some industrial building of new type in order to improving word condition and increasing utilization of energy. E.g. deep vertical Shaft Carries water chilled to decreasing hyperthermia harm of coal face, the methane is used by steel pipe drainage from deep coal area. Steel pipe’s instability under radial pressure lead to failure during deep shaft construction, calculative method applied isn’t perfect. Critical force of stability is analyzed by theoretical analysis、experimental research and numerical simulation, conclusions can be used for designing as a reference.
Simulating and Testing Study on Construction Temporal-Spatial Effect of Six Lanes Multi-Arch Tunnel
Authors: Jin Xiao Guang , Cui Bing Wei , Wu Meng Jun
Published: February 2012

Abstract: Owing to several construction procedures of bidirectional 6 lane multi-arch tunnel, with the characteristics of large dig span and flat cross section, the wall rock and support structure of which will be repeatedly disturbed by multiple excavations, so their mechanical and deformational features are remarkably complicated. Combined with the design and construction practice of Sha Tangkeng bidirectional 6 lane multi-arch tunnel of Guang-He highway, taking the V grade surrounding rock for case, with the help of 3-dimension finite element numerical simulation method and 3-dimension physical similar model test, the paper studied the entire dynamic construction process of bidirectional 6 lane multi-arch tunnel, analyzed the chang characteristics of displacement and stress of wall rock and stress of supporting structure, and revealed the time-space effect laws of construction of bidirectional 6 lane multi-arch tunnel.
Progress of Building Materials and Foundation Engineering in Ancient Iraq
Authors: Entidhar Al Taie , Nadhir Al Ansari , Knutsson Sven
Published: February 2012

Humans realised the importance of housing since the dawn of history. The first man used the caves as shelter. When agricultural activities dominated the life style of humans, villages started to be constructed. Later these were developed into cities. The dawn of civilization started in Iraq. The inhabitants in that time used the available natural materials in their construction. Reviewing the progress of engineering practices of ancient Iraq, reveals the facts that the inhabitants were aware of the principles of construction and engineering. The materials used and the design of the buildings were very suitable from both environmental and engineering perspectives. This work is a critical review of the progress and development of engineering practices and construction materials used in ancient Mesopotamia
Application of Stress Wave Reflection Method in Nondestructive Testing of Bolt
Authors: Bao Xian Kai , Li Yi
Published: February 2012

Bolt has been used widely in geoengineering all over the world in recent years, the testing technique of bolt develops quickly too. This paper summarizes simply the history of bolt testing technique, describes in detail stress wave reflection method. It is useful and valuable nondestructive.Testing method is verified with several parameters which estimate quality of bolting integrity.
Study on the Unload Interval Time of Thin Plate Penetration Test
Authors: Gao Yu Feng , He Shuai , Zhou Yuan , Wang Shu Mao
Published: February 2012

The thin plate penetration test method was presented by Professor T.S. TAN for the determination of undrained strength in high water content sludge. Based on the method, a thin plate penetration test device is designed. Through the thin plate penetration indoor test of dredged sludge, the unload weight and interval time of this test method are studied. The results shows that: if the water content range of soil sample can be segmented, and determine the appropriate interval time for unloading in each segment of the water content range, the efficiency and accuracy of thin plate penetration test method can be improved.
Seismic Damage Analyses of Staircases in RC Frame Structures
Authors: Jiang Huan Jun , Gao Hai Yan , Wang Bin
Published: February 2012

Staircases in Reinforced Concrete (RC) frame structures suffered severe damages in recent earthquakes although they are regarded as critically important passages during emergencies. Staircases act as the first line of defense in earthquakes, and therefore they first yield and fail. Then they lose the action of safe passages so that the anticipated seismic performance objectives cannot be satisfied. To make sure that staircases work as safe passages in strong earthquakes, the current Chinese code for seismic design of buildings claims special requirements on the design of staircases. At first, the influence of staircases on the structural behavior of a typical RC frame structure is studied by the comparison of internal force in the structural members considering and neglecting the effect of staircases under frequent earthquakes. Besides, the effect of staircases on the yielding and failing mechanism of the frame structure is investigated through static elasto-plastic analyses. From this study the reason of the damages suffered by cast-in-site staircases in RC frame structures under earthquakes can be understood.
Study on Blasting Seismic Effect of Tunnel in Fault Formation
Authors: Gao Fu Qiang
Published: February 2012

Based on the propagation characteristics of stress wave in crack rock, the propagation laws of seismic wave in fault formation were studied, and the field tests were carried out on Guanjiao tunnel of Qinghai-Tibet railway. The monitoring data of blasting vibration indicate that cracks prevent the propagation of seismic wave and the peak velocities of seismic wave attenuate rapidly in fault formation. The findings provide a reference on blasting vibration damage control in rock tunnel.
Study on Accuracy of CCFS Method for Calculating Seismic Response of Pipeline System Multiply Supported on Building
Authors: Guo Wei , Yu Zhi Wu , Wu Liang
Published: February 2012

Since 90s of last century, foreign scholars propose a floor response spectrum method for seismic analysis of pipeline system multiply supported on buildings, which is named as Cross-Oscillator Cross-Floor Response Spectrum (CCFS) method. The CCFS method is simple in calculation and its results are reliable. Firstly, basic assumptions in expression derivation of CCFS method are studied, such as not introducing support degrees of freedom of building, adopting displacement model and assuming white noise as earthquake excitation etc. All of these assumptions will lead to some shortcomings. Then, the defect root of CCFS method is explained by specific theoretical derivation process, and it is pointed out that utilizing CCFS method for calculating displacement of boundary degrees of freedom of pipeline system relative to building may lead to inaccuracy of results, and the white noise assumption for earthquake excitation will also certainly produce some errors. Finally, the defect of CCFS method is verified by numerical example. The conclusions can provide an important reference for reasonable application of CCFS method in seismic analysis of multiply supported pipeline system on buildings.
Response Characteristics of Large Span Structures Subjected to Non-Uniform Vertical Excitations
Authors: Liu Feng , Wang Lai
Published: February 2012

The objective of this paper is to study the response characteristics of large span structures subjected to multiple vertical excitations by means of time history analyses. The spatial variation of ground motions are represented as the combined effect of wave-passage and incoherency. They are simulated by the method of conditional simulation based on the selected four series of typical recorded ground motions. Some important responses such as internal force, displacement are monitored and compared between different cases. These analytical simulations provide a tentative work for investigating destructive effects of the multiple vertical excitations which can be solidified by further study and post-earthquake survey.
Analysis of Thermal Stress of Asphalt Pavement on Lean Concrete Base
Authors: Suo Li Jun , Yang Bin
Published: February 2012

Thermal stress has been an important parameter used in the analysis of the new pavement design. For the purpose of studying the thermal stress for the asphalt pavement of lean concrete base, first of all, three–dimension finite element model of the asphalt pavement is established. The two main objectives of the paper are investigated. One is analysis for thermal stress of lean concrete base, and the other is analysis for thermal stress of asphalt surface. The results show that thermal stress of lean concrete base increases, decrease and increase with increase of base’s thickness, surface’s thickness and ratio of base’s modulus to foundation’s modulus respectively. So far as the asphalt surface is concerned, maximum shearing stress and maximum tensile stress, which are caused by temperature difference, are evident in asphalt surface which is located in transverse contraction joint of lean concrete base of asphalt pavement.
Analysis of Rock Slope Stability Using Anti-Slide Pile
Authors: Gao Rui , Yang Ling Qiang
Published: February 2012

Using the measured experimental field data of two faults of a rock slope engineering, based on the large number of measured data analysis results of similar projects and rock style to determine the internal friction angle of the fault.the method of how to choose the good date was given. Back analysis method and number fitting method was used to determine the cohesion of fault; anti-slide pile is the lateral force column, the relation of the four failure modes of anti-slide pile was considered. The statistical parameters of resistance of anti-slide pile was calculated by structure mechnics. The norm recommended coefficient transmission method was used to determine function of random variables of slope sliding. The results show that using back analysis method and structure mechnics method to modify the parameter can decrease the uncertainty and improve the reliability of engineering design .
The Research of the Lime Soil Properties on the Road in Jilin Area
Authors: Li Dong Guo , Shi Gui Mei
Published: February 2012

Lime soil, literature [1] just gave a general rule to the mixture’s composition design. Because of the soil’s ingredient region difference, the reasonable mix of lime soil in special region must be determined by the test. This paper first quoted the formation of lime soil’s strength and the effect factor, and then regarded the non-side limitation compressive strength at different ages as inspection norm. Used orthogonal design method, the mix for the lime stabilized soil in Jilin area was investigated in this paper. The optimum mix and the main effect factor was determined by the strength at 28 days and verified by the regression strength at 90 days. In the meantime, the key problem had been summarized on the lime stabilized soil construction point and quality control.
Application of Cluster Algorithm for Travel Speed Classification Based on Cell Phone Handoff Location
Authors: Yang Fei , Liu Zhong You , Zhang Nian
Published: February 2012

The noise data results from two aspects, technically, different mobile phones traveling on different roads may generate the same handover sequence; operationally, signal error in mobile communication network possibly causes wrong handover information. Second, four types of noise data are summarized, that is wrong sample data from signal error, passenger cell phone sample noise data beside roads, vehicle cell phone sample ones between parallel and overlapping roads. Third, hierarchy and K means cluster algorithms are applied with SPSS software for the collected sample data cleaning based on real handover data by try and trial to produce link travel speed, which is compared with practical traffic situation. Finally, historic loop data is used as the baseline to evaluate the accuracy compared with cleaned results.
Non-Structural Cracking Analysis of early Age of Reinforcement Concrete Wall
Authors: Yao Ting , Zhang Jian Ye , Liu Jia Ping , Tian Qian
Published: February 2012

Structure monitoring has been increasingly valuable in recent years and has taken a leading role in the field of structural engineering. Date collected by early age monitoring represent a unique source of information for understanding the real behavior. In this paper, the temperatures evolution and concrete deformation evolution are obtained by real-time continuous monitoring of Reinforcement concrete(RC) wall. The result shows that the early age thermal cracking is one of the most important origin of several phenomena that imperil durability and shorten the lifespan of the structure. Though the wall is not considered as mass concrete, and has a big radiating surface, the maximum temperature can even reach up to 52°C due to heat generation of cement and the insulation of formwork, which can lead to shrinkage deformation when the temperature decreases. The measured experimental date can provide useful reference for early crack control and durability of RC concrete structure, and they can also be use to verify and improve the accuracy of the numerical results for RC wall, which is available in the future for basis to similar projects and research.
Investigation into Shear Coefficient for Circle Shear Test Method of Asphalt Mixture
Authors: Huang Tuo , Qian Guo Ping , Zheng Jian Long
Published: February 2012

In order to efficiently evaluate the shear properties of asphalt mixture, the circle shear test method is proposed. However, the thickness of upper layer surface and the middle-surface of the asphalt pavement in China are usually less than the height of standard specimen in circle shear test, as well as some laboratory specimens. In order to determine the shear strength for samples at different height, the circle shear test is conducted to the specimens at different height, and the height calibration coefficient for non-standard specimens are proposed. With which the shear strength for samples at different height can be unified and easily determined.
Stable Analysis of CWR Track by its Vibration Characteristics
Authors: Li Li , Luo Yan Yun
Published: February 2012

Stress contained in rails, mainly due to thermally-induced expansion and contraction, results in large longitudinal loads which lead to broken rails and track buckling. According to the beam bending theory of structural dynamics with a consideration of the influence of axial load, a CWR track model is developed in the present study to be used for extensive buckling analysis of CWR tracks. The model discusses CWR track vibration characteristics with a length of unsupported rail subjected to the longitudinal force due to fluctuation of temperature. From the result, it can be gotten that the critical point of the temperature which may cause the rail have the danger of unstable. This model would help to evaluated and measure the real temperature in rail by analyzing the dynamic response of CWR track.
The Questionnaires Design of Lane-Changing Behaviours by Union Method
Authors: Xu Hui Zhi , Cheng Guo Zhu
Published: February 2012

In order to optimize the questionnaires of lane-changing, to resolve the difficult question of small special the paper adopted a method of union design to get a plan on the method of SP and RP. The result showed that the answer and question were deduced, and drop the intension of reading and judging. The optimize questionnaires and conventional method were coherence. It could get all-sided characteristics of lane-changing.
Comparison of Skid Resistance and Noise between Transverse and Longitudinal Grooving Pavements in Newly Constructed Concrete Pavement
Authors: Li Bo , Kang Hong Wei , Zhang Zheng Wei
Published: February 2012

Pavement grooving is generally used to reduce hydroplaning and accidents by providing escaping channels for surface water. But the direction of grooving has influence on its performance. The purpose of this study is to provide a comparison of longitudinal and transverse diamond grooving pavement surface for newly constructed Portland Cement Concrete Pavement (PCCP) in terms of skid-resistance and noise feature. The test-section is located in LI Jia-he Tunnel of Lantian-Shangluo expressway. The results show that the transverse grooving has a better performance to ensure the longitudinal skid resistance than that of longitudinal grooving pavement. However, the longitudinal grooving has a good performance of preventing vehicle side slipping and reducing the noise than that of the transverse grooving pavement.
New Construction Technique of Soft Soil Foundation Consolidated by Plastic Drainage Slab
Authors: Tao Song Lei , Zhao Zhi Fang , Zhang Zi He , Yu Yuan Hong , Lian Xing Ge
Published: February 2012

Aimed to solve problems, such as deep soft soil foundation, strong wind and high wave and urgent construction period confronted in offshore dam construction, deepwater work ship has been researched and developed and further the construction and monitoring system has been innovated to break with traditional design and construction method, plastic drainage slab consolidation technology is to lead middle and low beach into offshore deepwater so as to quickly increase bearing capacity and settlement of the soft soil foundation and complete in construction period. This is characterized by security, reliability, economy and high efficiency.
Damage Analysis of Freeze-Thaw Processes in Hydraulic Structure Concrete
Authors: Gong Ya Qi , Cui Jian Hua , Su Hai Dong , Shan Liang
Published: February 2012

Based on the theory of damage finite element method, the deterioration process of hydraulic concrete under the freeze-thaw cycles is simulated. The damage evolution equation is deduced and freeze-thaw zone is discussed. The results indicate that the load capacity of structure is degraded under the freeze-thaw cycles. The deterioration of hydraulic concrete under the freeze-thaw cycles, however, is mainly limited at the region of the water fluctuation district and has a little effect to the overall structure. This means that the major loads causing hydraulic concrete failure under the freezing-thawing damage in the coldest region is not those of general design loads, such as gravity load and water pressure load, but the thermal loads, especially by the distinct daily temperature difference. Thus, the freeze-thaw modeling should consider these loads together.
Numerical Analysis of Concrete Arch Bridge on the Situation of Seismic Damage
Authors: Chen Hong Kai , Hu Ting , He Xiao Ying , Liu Rong Can
Published: February 2012

Based on the example, red-Flag Bridge in Chongzhou City, using the finite element to analyze the response spectrum of seismic performance for the concrete arch bridge under two conditions. Through the numerical analysis of vibrational damage on the whole bridge, reveals the nether structure and elements of bridge is affected by the seismic waves under the seismic effect and the great stiffness in upper structure, and posts that the anti-inertia in longitudinal direction is more powerful than the transverse and vertical ones. The deformation of arch ring is mostly affected by the displacement on transverse line, DY direction, and less in the longitudinal, vertical and rotational direction. According to the analysis of spectrum value displacement on abutment, finds out that the transverse direction of abutment is mostly affected by the displacement on DZ direction, for the abutment displacement, less in the middle, big in both sides. And for the vertical one, it is mostly affected by DY displacement, in the DY displacement of abutment, big in top, less in base.
Development of a New Reclamation Material by Hazardous Waste Solidification/Stabilization
Authors: Vacenovska Bozena , Drochytka Rostislav
Published: February 2012

This paper deals with the possibility of hazardous waste solidification/stabilization (S/S) using a secondary raw material – fly ash from fluidized bed combustion – in order to find and verify a suitable S/S formula and an appropriate way to ensure that the properties of the S/S product will allow its further use in civil engineering as a reclamation material. The aim of this paper is to examine the properties of the S/S product and to assess its impact on the environment. Laboratory testing was focused on screening those properties that may adversely affect the environment during the use of the product on the ground surface. During laboratory testing the S/S product’s properties were verified using leaching tests, unconfined strength testing, ecotoxicological tests and the determination of pollutant content in dry matter. This paper also considers the two-year durability of the S/S product’s properties in order to verify the short-term durability of the S/S matrix.
Investigation on a Novel PV/T Solar Collector
Authors: Wei Ping , Chen Hong Bing
Published: February 2012

A theoretical analysis of novel PV/T solar collector is presented in this paper. The collector is made of vacuum tube-PV sandwich and the heat extraction from PV panel by the water passing through u-shape cooper tube of the collector results in the reduction of the PV cells’ working temperature. This also improves the electrical and thermal efficiencies of the PV cells. Based on energy balance of each parts of the vacuum-tube-PV sandwich, mathematical models are developed to evaluate the energy performance of the PV collector and analyze its affecting factors. The simulation results indicate that the thermal efficiency increases slightly while the electrical efficiency decreases slightly with the increasing radiation. Both the thermal and electrical efficiencies increase by 1.4% and 0.23% respectively with every 10 kg/h increase in water mass flow, and decrease by 3.8% and 0.6% respectively with every 10 °C increase in inlet water temperature.
Comparative Study on Hybrid PV/T Heat Pump Systems Using Different PV Panels
Authors: Chen Hong Bing , Wei Ping
Published: February 2012

Many studies have found that the photovoltaic (PV) cell temperature plays an important impact on the solar-to-electricity conversion efficiency. Different cooling liquids like air and water have been introduced to pass across the PVs to reduce the cell temperature, and thus increase the electrical efficiency. In this paper, the refrigerant R134a is used as the cooling liquid and the PV/thermal (PV/T) panel is coupled with a heat pump system acting as the evaporator, which is expected to achieve a better cooling effect and energy performance due to its low boiling temperature. Two different kinds of PV/T panels, glass vacuum tube (GVT) type and flat plate (FP) type, are proposed for the study on the energy performance comparison. The results show that the GVT PV/T panel has an average thermal efficiency of 0.775 and an average electrical efficiency of 0.089 (based on the reference efficiency of 0.12), which is 73.4% and 1.1% higher than that of the FP PV/T panel respectively, with the solar radiation varying from 200 W/m2to 1000 W/m2. The GVT PV/T heat pump system has an average COP of 5.6, 9.8% higher the FP PV/T heat pump system. The GVT PV/T heat pump system has a better energy performance than the FP PV/T heat pump system.
Development of Monitoring Open Mining Slope on TM30
Authors: Yang Feng Yun , Zhao Wen , Xu Mao Lin
Published: February 2012

Discuss monitoring way of slope sliding of ANGANG open mine on Robotic Measuring System TM30 technology and processing data’s method, according to survey speciafication of deformation observation, analyses deformation result and compares it with speciafication of deformation observation, reports it to the mine company to insure safety and stability of mine produce. Deformation monitoring on Robotic total station TM30 that is Observation flexible, high precision and high efficiency is worth spreading.
Experimental Study on Strength and AE Characteristics for PFRC with Different Fiber Content
Authors: Wang Yao , Wang Yan , Xuan Wei Hong , Zheng Gang , Chen Yu Zhi
Published: February 2012

Tests for compressive strength and splitting tensile strength were performed on the concrete reinforced by Polypropylene Fiber of two diameters and of three fiber contents respectively and the whole loading process was monitored by acoustic emission (AE) technique. The test results showed that compressive strengths of Polypropylene Fiber Reinforced Concrete (PFRC) changed slightly with the increasing of fiber content but that splitting strengths changed more. The change rule of splitting strengths with fiber content was related to Fiber diameter which would determine a certain average fiber distance in concrete. There existed a bound value of average fiber distance, which was the most favorable to the splitting strength. Nine AE parameters of specimens received from their splitting tests always showed maximum or minimum at a fiber content of 0.6 kg/m3, which meant that these parameters would be helpful to the further research for the action mechanism of fiber in concrete.
Risk Assessment and Control Measure of Debris Flow in Chunyashu Gully of Seismic Disastrous Area of Sichuan Province
Authors: Chen Ji Hua , Wu Hui Ge , Zhou Hai Hui , Zhang Hai Liang
Published: February 2012

The terrain of Chunyashu gully in Dujiangyan city of Sichuan province was steep, plenty of loose material increased after the Wenchuan earthquake. Debris flows were triggered in September 2008 and August 2009, and the debris flow was a serious threat to the highway and the residents. Risk of Chunyashu gully debris flow had been analyzed by the latest assessment method, and the result was that the risk degree of this gully was middle. Finally according to the local situation the control measure of interception dam and other advices had been suggested to protect the safety of the residents.
Cost Estimation Method of Post-Earthquake Rehabilitation of Power System
Authors: Wang Yan Ru , Dai Jun Wu , Zhang Mao Yu
Published: February 2012

Power system related to the people's livelihood is an important lifeline and its rapid post-earthquake rehabilitation and reconstruction is particularly important. Considering the importance of power system, cost estimation method of post-earthquake rehabilitation of power system is proposed. Based on the direct economic losses of power system, post-earthquake rehabilitation cost is given by index of the post-earthquake adjustment factor which is put forward according to post-earthquake rehabilitation cost and direct economic losses of power system in “5.12” Wenchuan earthquake. Cost estimation method of post-earthquake rehabilitation of power system could provide good suggestions for post-earthquake rehabilitation work.
Modal Test on an External Prestressed Steel Beam
Authors: Zhang Jun , Zhou Zi Wen , Ni Xiao Lu , Chen Hao , Zhu Peng Cheng
Published: February 2012

Modal experiments are present to study dynamic behaviors of an external prestressed steel beam. The impact testing is introduced, when the input is fixed and FRFs are measured for multiple outs. Modal results indicate that the modal shape will increase when external prestressed load exists; the first order frequency of external prestressed load on the beam is higher than that of no load, but the amount of loads have little influence on the value of damping coefficients and the first order frequency; and there are denser frequencies with lager external prestressed load.
Preliminary Research on Effective Length of Concrete Filled Steel Tubular Columns in Sway Frame
Authors: Shi Yan Li , Wang Feng , Wang Wen Da
Published: February 2012

The effective length of concrete filled steel tubular (CFST) frame columns is a key parameter to determine its ultimate strength for engineering design. There was no special design code, so engineers usually got the values according with specification for steel structure. This may cause error in some degree. Based on liner and non-linear buckling analysis respectively, the overall stability of a typical planar composite frame with CFST columns and steel beams was performed in this paper. By comparing the results of finite element method with current approach, some primary conclusions were given to refer for engineering practice on the composite frames.
Stress Analysis of Asphalt Overlay on Old Cement Pavement by Impact of Rolling Technology
Authors: Bian Chao , Song Jin Hua , Liu Zhao Wei
Published: February 2012

Cement concrete pavement road performance gradually decay with vehicle load and environmental factors in long-term effect. When the usability of the road surface reduces down to limiting bottom line standard, it can be used to repair asphalt overlay technique with the advantages of short duration, little impact on traffic road repair service and good performance. According to the force characteristics of old asphalt overlay concrete structure, this paper studies the impact of reflective crack propagation mode, fragments after impact on the asphalt overlay of the stress response with ANSYS finite element numerical simulation analysis, and it reveals the rolling technology can effectively reduce the impact of reflective cracking.
Study on Topology Optimization Design of Steel Frame Bracing System Based on Discrete Model
Authors: He Jia Nian , Wang Zhan
Published: February 2012

Comparing with the frame structure without any aseismic members, bracing-frame is a better form for the aseismic frame structure. But the form of bracing –frame is determined by the engineering experience. The best design plan can’t be determined using the traditional design method. In order to find the optimal result for the bracing –frame structure, the bracing system topology and the semi-rigid connection topology was considered in this paper. And the optimal model was built based on on discrete topology math model. And the dominant winning role for genetic algorithm was adopted due to a large number of non-linear problems. Through the optimal design for active semi-rigid frame bracing system based on discrete topology method, we can get the best design plan in whole structure system, which have better engineering significance and reference value usually.
Study on Suspended Mass Pendulums for Vibration Control of Transmission Tower under Seismic Excitation
Authors: Tian Li , Li Wen Feng , Wang Zi Long
Published: February 2012

In order to research the effectiveness of passive control on transmission tower vibration control under seismic excitation, suspended mass pendulum (SMP) is carried out in this study. Based on the mechanism and equation of earthquake vibration control, earthquake induced vibration control for transmission tower model with suspended mass pendulums was performed by using numerical simulation. Using SAP2000 software, three-dimensional finite element model of a transmission tower is created, and seismic records are selected by different site soils. Typical time history curves and the maximum responses of displacement, axis force, shear force and moment of the transmission tower without and with suspended mass pendulums are obtained by numerical simulation analysis. The results show that the SMP is very effective in mitigating tower vibration, and the method can be a reference for practice engineering application.
Wind Tunnel Experimental Study on the Evaluation Criterion of Wind Environment at Pedestrian Level Based on Objective Behavior Study
Authors: Chen Yong , Chen Chao , Wang Xu
Published: February 2012

In order to determine the criterion for the threshold exceedance method, which is for wind environment evaluation, the relevant theory and wind tunnel experiment means were proposed herein. Maximum joint probability decision rule and empirical mode decomposition are employed to deal with the results of wind tunnel experiment, so that the criterion obtained would be more reliable. The effects of a gusty wind on human are also considered. The comparison of the present results and the other criteria is conducted. It indicates that the former is slightly stricter.
Fatigue Analysis of Gantry Crane Based on ANN
Authors: Xiong Ling Hua , Wang Fan
Published: February 2012

Fatigue failure is the major cause of malignant accident of gantry crane. In this paper fatigue analysis of gantry crane is studied . Based on the result of FEM(Finite Element Method) and the ANN(Artificial Neural Network), nonlinear ralationship between fatigue damage and dynamic load is built. By the trained ANN, the corresponding fatigue damage is obtained when input random sampling load data, and then fatigue life is calcutated. The Example shows high efficient and accuracy of the present method.
The Application of Parametric Design in Landmark Building Creation
Authors: Wang Rui , He Hang
Published: February 2012

As a new approach of the sustainable design, parametric design, which is also known as computational design, has become the new focus in architecture digital design. Parametric design which mostly applied in architectural design of landmark building is a special architectural type. Instead of ignoring social attribute and environmental characteristics of building, more architects are attracted to the amazing form of building from the result of parametric design. We should pay more attention to context, environmental factors and social influence in parametric design process, and give landmark building more social significance.
Preliminary Experimental Results of a Masonry Building Prototype Subject to Harmonic Forces of Different Intensity
Authors: Cancellara Donato , de Angelis Fabio , Pasquino Vittorio
Published: February 2012

In the present paper an experimental study has been performed on a masonry building prototype and some preliminary experimental results are illustrated for analyzing the structural behavior of a masonry building prototype subject to harmonic forces of different intensity. The physical model used for the laboratory test is a two-story masonry building characterized by a regular floor plan. The structure test is subjected to a harmonic force input supplied by a vibrodyne. The experimental results are aimed at characterizing the dynamic response of the masonry building subject to harmonic forces in order to describe the bahaviour of the masonry building under the predominant actions of a seismic input.
The Small Scale Effect on Linear Vibration of Beam-Like Nanostructures
Authors: Li Cheng , Yao Lin Quan
Published: February 2012

Transverse free dynamics of a beam-like nanostructure with axial load is investigated. The effects of a small size at nano-scale unavailable in classical mechanics are presented. Explicit solutions for natural frequency, vibration mode and transverse displacement are obtained by separation of variables and multiple scales analysis. Results by two methods are in close agreement.
Ultimate Behavior of Single Shear Bolted Connections with Thin-Walled Aluminum Alloys(6061-T6)
Authors: Kim Tae Soo , Jo Yong Hyun , Kim Seung Hun , Lee Yong Taeg
Published: February 2012

The purpose of this study is to investigate the ultimate behaviors of aluminum alloy bolted connections assembled with four bolts. Specimens for single shear bolted connections were tested and finite element analysis based on this test results was conducted. The validity of finite element(FE) analysis for predicting the structural behaviors such as ultimate strength, fracture mode and curling(out-of-plane deformation) occurrence was verified through the comparisons between test results and FE analysis results. It is known that the curling resulted in sudden strength drop. Moreover, FE models with free edge and restrained out-of-plane deformation for curled specimens are analyzed additionally, therefore, the influence of curling on the ultimate strength; strength reduction ratio is estimated.
Anime Sante Church's Dome After 2009 L'Aquila Earthquake, Monitoring and Strengthening Approaches
Authors: Boscato Giosuè , Rocchi Davide , Russo Salvatore
Published: February 2012

This work shows the results of monitoring of Santa Maria del Suffragio (Anime Sante) church, L’Aquila, Italy. The historical building was stricken and damaged by mainshock of April 6, 2009; the dome is the structural element that has been seriously hit by seismic event. The ambient response analysis of global structure and dome element enable to improve the FE model by model updating methodology using modal data. The identification techniques furnish useful information concerning the structural and mechanical properties of dome’s structure, these parameters are needed to evaluate the appropriate design of rebuilding and structural rehabilitation of dome. The geometric configuration and the self-weight of lantern induce to an independent dynamic response of macro-element against the behaviour of dome generating the first mechanism of collapse and the failure of dome shape. Different retrofitting configurations for the dome have been proposed in this paper.
Modeling and Application of TMD for Vibration Control under Wind Load in High-Rise Buildings
Authors: Yuan Ju Yun , Dong Zhi Hua
Published: February 2012

Based on brief introduction of the vibration control theory of tuned mass damper (TMD) and its development course, this paper puts forward the basic method in model analysis of TMD for vibration control under wind load in high-rise buildings. After analyzing the recent applications of TMD in high-rise buildings at home and abroad, the developing trend and problems to be solved in TMD design and construction are also pointed out.
Interface Shear Stress of Concrete Beams Strengthened with FRP in Salt Water
Authors: Zhao Chen , Huang Pei Yan , Chen Zhong Song
Published: February 2012

Based on existing methods and results of other research, the bond-slip relationship model is given and the distrubition of shear stress of concrete beam strengthened by FRP in salt water is derived. Through a specific example to analyze the distribution of interfacial shear stress, and the different effects caused by different aggressive environment on the interfacial properties. The results show that: 1) Interfacial shear stress will sharply reduce with increasing distance from the end; 2) Different environments have different effects on the interface properties of FRP strengthened beams. Salt water erosion influnce the interfacial properties of FRP strengthened beams significantly.
Hot Forming Flow Stress Model of Steel 50A1300
Authors: Zhou Xu Dong , Liu Xiang Ru , Shan Xu Yi
Published: February 2012

The researches of non-oriented silicon steel are mainly focused on the effect of main processing parameters on the microstructure and magnetic properties, but there have been few studied about its flow stress until now. In this paper, the non-oriented silicon steel 50A1300 of hot forming is studied by thermal-mechanical simulation method. The hot deformation behavior of the steel is explored and the flow stress model of the steel is established based on the creep mechanism. The model has good accuracy and is feasible.
Large Deformation Geometric Nonlinear Beam Element Based on U.L. Format
Authors: Xia Yong Jun , Miao Qian
Published: February 2012

Based on the geometric deformation of the Euler-Bernoulli beam element, the geometric nonlinear Euler-Bernoulli beam element based on U.L. formulation is derived. The element’s transverse first-order displacement field is constructed using the cubic Hermite interpolation polynomial, and the first-order Lagrange interpolation polynomial is used for the axial displacement field. Then the additional displacements induced from the rotation of the elemental are included into the transverse and longitudinal displacement fields, so those displacement fields are expressed as the quadratic function of nodal displacement. Afterwards the nonlinear finite element formulas of Euler-Bernoulli beam element under the form of U.L. formulation are derived using Cauchy strain tensor and the principle of virtual displacements. The total equilibrium equation and tangent stiffness for large displacement geometric nonlinear analysis of frame are obtained in the total coordinate system. The correctness of this element is proved by typical example.
Analysis of Mechanical Behavior of Subway Tunnel Constructed by Cover and Cut Reverse Method
Authors: Wang Tie Cheng , Gao Yang , Zhao Hai Long
Published: February 2012

In the paper, not only the internal force and displacement of structure during subway tunnel construction with cover and cut reverse method, but also the displacement field and stress field of surrounding rock are analysed. From the numerical calculation it is shown that the bending moment of diaphragm wall is affected seriously by the distribution and value of the stiffness of horizontal support; the excavation phase of the soil of the second floor underground is the key phase of the construction process because the internal force of structure has large increase; the value of surface settlement, horizontal displacement of diaphragm wall, differential settlement between middle pillar and diaphragm walls all meet the requirements, so the construction is safe and the surrounding buildings are affected slightly.