bluuebunny/crossref_metadata_2025 huggingface dataset:
Nonlinear numerical analysis of SRC Frame Joint
Authors: Kong Jie , Zou Yun , Wan Zhi Wei , Li Cheng
Published: September 2013

Nonlinear numerical analyses for the stress performance of SRC frame intermediate joints, side Joints and end joints are processed in this paper with the finite element software of ABAQUS. Compared with experimental results under static loading, numerical analysis results are found to be reasonable. Then the influence of factors such as shaped steel ratio and axial-load ratio are contrastively analyzed under cyclic loading. The results show that shaped steel ratio has a greater influence on the bearing capacity and hysteretic performance of the structure and with the steel ratio increases, the hysteretic performance is better. But the axial-load ratio has less influence.
Experimental and Numerical Study of RC Thin-Walled Channel Beam under Torsion
Authors: Hu Song , Ye Ying Hua , Chen Sheng Gang , Song Guan Zhong
Published: September 2013

The reinforced concrete thin-walled channel beams are widely designed as bridges in urban railway and city roads. The swing force in the driving which cause constrained torsion becomes a safety factor. The torsion resistance of concrete members is not adequate to thin-walled channel beams, which is based on the theory of spatial truss with variable angle. An experiment was conducted to test the mechanical properties of the thin-walled channel beam under torsion. The mechanical properties of RC thin-walled channel beam under restrained torsion were also researched with Finite Element software, and were compared to the result of the experiment. The result of FE model agreed well with the experiment.
Research on the Concrete Structure Deformation Properties of Xiangjiaba Ship Lift Tower
Authors: Li Song Hui , Zhang Guo Xin , Liu Yi
Published: September 2013

The passing dam building of Xiangjiaba water conservancy project adopts gear-rack climbing vertical structure. The structure demands highly on the deformation compatibility of relative displacement between tower and nut column, and rack and guide. If it is constructed poorly, it will directly influence the ship lifts running and construction period. The paper takes this as its key research object. 3D FEM is used to analyze the tower structure, mainly calculating the deformation of the tower under the temperature, weight, wind load and other loads in a normal single case and combination cases. By focusing on the theory analysis of the important parts such as nut column, rack and guide, the structures deformation fitness, this paper offers a fair theoretical reference and technological guidance to the construction of every part of the tower.
Back Analysis on Tunnel Rheological Parameters
Authors: Huang Qiang
Published: September 2013

The surrounding rock strain field monitoring have been done during a highway tunnel excavation. The rock rheological parameters was inversed by neural network based the field monitoring data. The predicted value and the field monitoring data have been compared, the result shows that the difference is 12%, the predicted value is credible.
Research on Influence Mechanism Analysis of Poisson Ratio in Soil-Stone Mixture
Authors: Zhang Yu Hui , Zhu Qiang
Published: September 2013

The poisson ratio test equipment of large vibration compaction was designed and adopted to simulate the changes of poisson ratio in soil-stone mixture, by large laboratory vibration compaction test under the condition of different water content and different soil-stone proportion with sandy soil, silt soil and low liquid-limit clay. The volume expansion ration (γv) was introduced to study the influence mechanism of poisson ratio (μ) in mixture with different water content and different soil-stone proportion. The change regulation of poisson ratio with different dry density under the soil type be changed was revealed. The results show that if the water content and soil-stone proportion are fixed, poisson ratio increases with decreasing of dry density; poisson ratio in mixture decreases while the μ-γv curve is down and the trend growth of curve becomes slow with the increasing of stone content; poisson ratio in mixture increases while the μ-γv curve is up with the increasing of water content. The conclusion is valuable in poisson ratio study of soil-stone mixture.
Supporting System and Monitoring Analysis of the Cut-Cover Tunnel in Shouyi Square of Wuhan
Authors: Chi Xiu Wen , Fu Tao , He Zhi Liang , Lin Chi
Published: September 2013

The 1.39km long tunnel in Shouyi Square of Wuhan is situated at the main artery of the city traffic. To ensure smooth construction of this tunnel project, a varieties of supporting systems such as rubble retaining wall, piles and steel supports, cantilever piles, pile-anchors, shotcrete-bolts are adopted. Meanwhile, safety monitoring is carried out using advanced monitoring instruments and methods with emphasis on the key cultural relic of Hubei province Honglou. The influence of the foundation excavation construction on Honglou is informed by analysis of monitoring result and the monitoring prediction provides forceful support for decision-making during the construction. In this way smooth construction of the foundation excavation and safety of Honglou are ensured.
Numerical Simulation of Subway-Induced Environment Vibration
Authors: Li Pei Zhen , Pan Zhao Hui , Li Xiu Qiang , Yue Jian Yong
Published: September 2013

The ABAQUS software was used to establish an actual soil layers-tunnel model in which the infinite element boundary was adopted. Then, frequency domain analyses were conducted on the model under vertical train loads with different frequencies. The attenuation of the vertical displacement amplitude on ground surface under each load was computed in the area ranging from 0m to 30m. The results show that the displacement amplitude may rebound in a particular area under some loading frequencies and this phenomenon is closely related with the loading frequency.
The Special Geological Conditions of Mountain Tunnel Scheme Selection
Authors: Sun Li Xia , Wang Qing Bo , Wang Da Peng
Published: September 2013

According to the different topographic and geologic conditions of mountain highwaytunnel project has been "It is difficult into the hole and out the hole " argument. The paper is WuGuanhigh-speed road asymmetric bias multi-arch tunnel, and the orthogonal hole separated tunnel, near themountain steep high slope of shallow buried tunnel into the hole as an example. Through theconstruction of practical engineering, analysis in special conditions is done and the mechanicalmechanism of hole program is correctly chosen. Importance and the experiences are summarized, toguide the engineering practice.
Study on Harbin Metro Shield Tunnel Segment and the Deformation of Tunnel Rock
Authors: Yang Yue , Chen Xiao Guo
Published: September 2013

Deformation of segment and rock is one difficult question of the subway design. When building the calculation model of the liner we mainly think about the effect on the liner of the joint and the resistance force of the earth. In this paper the joint of the model of the used model is improved and the inner force formulas for the new model are derived. At last, the derived formulas and the existing formulas are validated by Harbin Metro Line 1. According to the research result, we can know the formulas derived in the paper are credible and they have academic practical meaning for design and construction of the subway liner.
Metro Emergency Management Capacity Assessment Research Based on AHP-FCE Model
Authors: Shi Qing Xue , Li Li Xin , Jia Shi Long , Zhang Yi Bo , Zhang Shuang
Published: September 2013

Based on the characteristics of the Metro Operation System and the types of accidents, linked with Metro Operation Emergency Management System, this thesis develops a System of Metro Emergency Management Capacity Evaluation Index. Whats more, with the application of Analytic Hierarchy Process (AHP) and Fuzzy Comprehensive Evaluation (FCE), it also sets up the Metro Emergency Management Capacity Evaluation Model AHP - FCE Comprehensive Evaluation Model. Finally, the model comprehensively evaluates the ability of the domestic Metro Operation Emergency Management System. By analyzing the evaluation results, the author finds out the vulnerable spots of the system and puts forward his own opinions for improvement.
The Construction Monitoring and Data Analysis of the Zhang JiaQu Tunnel
Authors: Ao Hai Xia , Zhang Yue
Published: September 2013

The monitoring measurement on-site, which monitors the stability of surrounding rock and tests the rationality of design, is an indispensable mean. In the process of construction, the Zhang Jiaqu tunnel is open, by monitoring the whole section, guiding and determining the construction time of secondary lining and mastering the working state of primary supporting. This paper introduces the main content of monitoring measurement and analyzes the monitoring data, so as to provide the reference for similar projects.
Study on Characteristics of Flow and Sediment for Xiaomiaohong Tide Inlet in Radial Sand Ridges
Authors: Chen Ke Feng
Published: September 2013

Based on the measured hydrological data and the established mathematical model of Xiaomiaohong channel, the current and sediment distribution characteristics are researched and analysed. Some conclusions are drawn as follows: (1) The maximum velocity and mean velocity of the measuring points in the groove were generally greater than those at points in the open waters; spring tide and neap tide strength difference is apparent, spring tide should play a major role in the beach evolution. (2) Suspended sediment concentration in the open sea is significantly lower than that in the tidal channel; the bottom sediment concentration is generally greater than surface, bottom surface sediment concentration is 1.12 ~ 1.66 times (3) Median particle diameter of suspension sediment is 0.005 ~ 0.017, mainly for fine silt and very fine sand.
Study of Wave Structure Interaction Based on the SPH and FCBI Algorithm
Authors: Yuan Lang Huan , Zhu Feng , Geng Ying , Fang Bo
Published: September 2013

Abstract. Based on the theory of numerical calculation, the SPH algorithm and FCBI algorithm were used to establish the corresponding water body model, and to calculate the fluctuations of the water by controlling water boundary parameters. In addition, the dam model was established based on the finite element method, and correspondingly two-way coupling with these two fluid boundary in order to examine the effect of fluid structure interaction by these two algorithms. The calculated results show that: the wave shape generated by this two algorithms is broadly consistent, however, the results obtained by the SPH algorithm can more completely show details; In addition, wave structure interaction effect calculated by SPH algorithm is stronger than the ones derived from FCBI algorithm, with the non-linear characteristic of the wave increase, the difference of the two algorithms is increasing. The the wave force calculated by the traditional linear wave theory needs some correction.
Determination of Correlation Parameters of Near-Bed Sediment Flux
Authors: Luo Feng , Ge Li Li , Kong De Yu
Published: September 2013

It is difficult to solve the near-bed sediment flux of suspended sediment transport equation under the non-equilibrium condition by theory analysis and numerical calculation. There are many variances, empirical coefficients and expressions undetermined. Bed shear stress is active methods to determine near-bed sediment flux. By comparing and analyzing of the research achievements, this paper provided the parameters spans, formulas of the variances and their correlations for determining the sediment flux, in the hope of promoting the sediment research.
Wave Forces on the Composite Bucket Foundation of Offshore Wind Turbines
Authors: Liu Guang Wei , Zhang Qing He , Zhang Jin Feng
Published: September 2013

A three dimensional numerical model to calculate the wave forces on the composite bucket foundation of the offshore wind turbine is established and the analytical method to approximatively calculate wave forces on the structure with the variable cross section is proposed. Based on the validation of numerical results, wave forces on the composite bucket foundation are calculated under different wave conditions. The variable cross-section of the composite bucket foundation is divided into sections with the approximate same diameter. Comparison with the numerical calculations and analytical results, the wave force on each section can be calculated using Morison equation when the relative diameter is less than 0.2 and using diffraction theory when the relative diameter is more than 0.2.
Numerical Calculation of Soil Pressure inside the Lattice Type Steel Sheet Pile Wharf Structure
Authors: Gui Jin Song , Fu Yu , Bi En Kai
Published: September 2013

Lattice type steel sheet pile wharf is a new type of wharf structure, which is increasingly and widely used, but its structure is complicated, and the calculation theory is not perfect. This paper uses the general finite element software ABAQUS to establish the finite element numerical calculation model of grid shape steel sheet pile structure. The result was deeply researched and analysed,so some useful conclusions are drawn that can be used as references in the engineering application.
Influence of Bulk Density on Cohesive Deposits Incipient Motion
Authors: Zhang Xin Zhou , Xu Xue Song , Zhao Xiao Dong , Wang Xiang Ming
Published: September 2013

Based on the essential characteristic of cohesive deposits, from the motion mechanism of cohesive deposits to start with, incipient motion of cohesive deposits laws under different conditions of bulk density and flow are studied by flume experiment. The research results show that the incipient motion of cohesive deposits is greatly influenced by the bulk density. The incipient motion velocity is increase with the growth of bulk density.
Influence of Rotational Stiffness on the Distribution of Horizontal Forces on All-Vertical-Pile-Supported Wharf Structures
Authors: Tao Gui Lan , Dong Si Yuan
Published: September 2013

A calculation method of rotational stiffness of all-vertical-pile-supported (AVPS) wharf is discussed and a formula based on rotational stiffness is derived to evaluate the distribution of horizontal forces on an AVPS wharf. Combining with an engineering example, the rotational stiffness and the horizontal force distribution coefficients were calculated utilizing finite element method (FEM), the elastic support-rigid beam method (ESRBM) outlined in Chinese Harbor Code, as well as the proposed formula for the piles layout width-length ratio of 0.4, 0.5 and 0.6. Results indicate that the increase in width-length ratio will increase the rotational stiffness and make the distribution of horizontal forces on each bent to be more uniform. Results calculated by the proposed formula are agree well with the results by FEM. The maximum difference of the distribution coefficient on the first bent between the results obtained by the proposed formula and by ESRBM is approximately 22%.
Experimental Study on Flow Conditions of Jiaogang Ship Lock during Sluice Gate Hoist
Authors: Wu Teng , Ding Jian
Published: September 2013

The physical model of Jiaogang Ship Lock is established. Through model test, the flow condition in lock chamber and approach channel is studied. The results indicate when the upstream water level keeps high and the water level difference between upstream and downstream is less than 0.5 meter, the main flow oscillates less during spring tide flux and reflux in the flood year. When the upper water level is 0.96 m and during spring tide flux and reflux in the flood year, the flow is from downstream to upstream and the flow is smooth. When the upper water level is greater than lower water level, the sluice gate hoist condition is tidal range less than 0.3m in tide flux and less than 0.4m in tide reflux. Under the critical water level conditions, the Jiaogang Ship Lock sluice gate can be hoisted safely.
Research on Engineering Geological Properties of Dredger Fill in Tianjin Qingfang Economic Region
Authors: Li Xin Jie , Wang Qing , Yan Huan , Li Jia Qi , Wang Fei Fei
Published: September 2013

With the development of the coastal cities, land reclamation has become an important part in the construction of coastal engineering and the coastal development projects. In this paper, we consider the dredger fill of Tianjin Textile Economic Region as the research subject, analyzing the engineering geological characteristics of the dredger fill in this area from its basic physical properties, the soluble salt of the study area, the variation laws of PH and cation exchange properties.
Numerical Simulation of Tidal Waves Variation in the North Branch of the Changjiang Estuary
Authors: Gu Jie , Ma Dan Qing , Qin Xin , Wang Xiao Li , Yang Ji Zhong , Hu Tian , Wang Yuan
Published: September 2013

A 2D numerical model about the Changjiang Estuary was set up with MIKE 21 in this study, which was well calibrated and verified with the observed tidal levels, flow velocities and flow directions, the computed results agree well with the measured data. Then the model has been applied to calculate the tidal level in the North Branch during spring and neap tide in flood season. The results show that, from the middle reach to the upper reach of the North Branch, the high tidal level is lower and lower and the low tidal level is upper and upper, so the tidal range is decreased, and tidal range during spring is greater than the one during neap. The tidal peak appearing time in the upper reach of the North Branch lags behind that of the middle reach, which is obviously during neap tide. The tidal level curve of the middle reach of the North Branch is smooth and close to the simple harmonic curve, while that of the upper reach of the North Branch deformities, the tidal level curve of ebb tide change fluctuant, much more obviously at spring tide.
Review on the Specific Characteristics of the Sediment Movement in Estuary Sandbar Area: With the Yangtze Estuary as an Example
Authors: Gu Jie , Wang Xiao Li , Qin Xin , Ma Dan Qing , Yang Ji Zhong , Hu Tian , Wang Yuan
Published: September 2013

Sandbar is the main geomorphic unit in estuary, and due to the effects of runoff, tide and fresh-salt water mixing, the sediment movement there differs from others. Taking the Yangtze Estuary as an example, firstly, its sediment transport forms many circles both in longitudinal sections and transverse sections. Secondly, its sediment trapping is controlled by two different mechanisms, tidal current and salt water. The former contains the delay effect of sediment deposition and incipient motion, the asymmetry of flood and ebb, and the separation of flood and ebb, whereas the latter includes the influence of the saltwater wedge density current, the aggregation of the saltwater intrusion fronts, and the trapping of flocculation. Finally, its sediment re-suspension occurs three or four times ,not noly at the moment of flood or ebb maximumbut also at the transferring period from flood to ebb or from ebb to flood.
Influence of Main Structural Dimension on the Shear Lag Effect of Box Girder Used in Cable-Stayed Bridge
Authors: Zhang Yu Ping , Li Chuan Xi
Published: September 2013

Through simulating box girder with shell element, the influence of the top flangebottom flange and web thickness on the shear lag effect of box girder used in cable-stayed bridge was discussed on the background of Jianning bridge in Zhuzhou. Parameter analysis of the thickness change of the top flange, bottom flange and web on shear lag effect of box girder was based on analyzing and comparing the calculated results. The results show that the thickness change of the top flange, bottom flange and web have more influence on the shear lag effect of top flange than that of bottom flange; thickness increase of bottom flange and web can make the shear lag effect intensified obviously; and thickness change of web has the most significant influence on the shear lag effect among them for box girder with single box and three rooms used in cable-stayed bridges.
Central Buckle Influence Research on Dynamical Characteristics of Suspension Bridge
Authors: Wang Da , Chen Chun Miao , Liu Yang
Published: September 2013

In order to study the influence of the central buckle to the long-span suspension bridge structure mechanical characteristic, the Siduhe Bridge in Hubei Province was taken as the research background, the study were carried on the vibration characteristics, the driving comfort and the vehicle-bridge coupled vibration, which effected by the central buckle of the long-span suspension bridge. The results show that the central buckle has great impact on the large-span suspension bridge natural frequency, the central buckle can large extent increase the structure rigidity, improve the structure self-vibration frequency, and enhance the stability. The vehicle has good comfortable performance when droved on the bridge, and the central buckle has less effect on the comfortable quality. The central button setting can effectively reverse the lower stiffening girder displacement, and improve the stability of the bridge traffic.
Effects of Multiple Aquifers on Calculating the Bearing Capacity of Foundation
Authors: Wang Xiao Liang , Li Guang Fan , Hao Wan Jun
Published: September 2013

In this paper, the effects of multiple aquifers on the calculation of bearing capacity of foundation are represented. One side is how to ascertain the maximal influence depth of underground water, and the other is which to take from the unit weight of soil in the condition of multiple aquifers.
Experimental Study of the Changes of Morphodynamic Process Caused by the Hong Kong-Zhuhai-Macao Bridge
Authors: Ji Rong Yao , Xu Qun , Mo Si Ping
Published: September 2013

In order to predict the effects on the hydrodynamic environment caused by the Hong Kong-Zhuhai-Macao Bridge, the physical model is built to analyze the changes of morphodynamic process. The experimental results show that the drag force on flow is increased and the flow section area is decreased by the two large artificial islands built in the sea. The opposite side of the artificial islands, there is the recirculation zone with many vortexes in different scales, which have the periodic change from formation to disappearance. Near both ends of the artificial islands, the velocities of tidal currents increase, then the seabed has obvious erosion trend. Affected by the topography, hydrodynamic conditions, as well as by the position, shape and scale of the artificial islands, the changes of morphodynamic process caused by both the west artificial island and the east one is similar in the change rules and different in the forms.
Research of Base Form for Detached and Re-Installed Concrete Bridge Barrier
Authors: Yan Shu Ming , Liang Ya Ping , Chen Xiang Yun , Wang Yi Chuan
Published: September 2013

To meet the requirements of construction convenience and protection level for concrete bridge barrier, this article researches the base form of detached and re-installed barriers. Considering integrity and dismounting convenience, four base forms were put forward such as anchor bolt connected base,outside embedded base, inside embedded base and steel bar welded base. The four base forms were compared through computer simulation, bogie test and analysis of construction convenience. The researches show that there are more probability for inside embedded base and outside embedded base to overturn in practical application. The anchor bolt is likely to cause stress concentration of connection location, and difficult to install. Rigid connection between barrier and bridge frange plate was formed by base steel welded with anchor plate, and so the integrity is better and the construction is convenient and feasible. And so steel bar welded base is the best and suitable for application in the project.
Design and Testing of Shock Transmission Device for Bridge Protection
Authors: Liang Jie
Published: September 2013

The design of the shock transmission unit (STU) was based on the maximum displacement, nominal load, lock up velocity and other parameters. The STU was subjected to a series of tests for checking its behavior. During the slow movement test, the resistance force is 10kN; during the simulated dynamic test, the deflection between the point of zero load and the point of maximum load is 4mm, and the deflection during the sustained load portion of the test is 5mm; during the fast movement test, the STU locked up within 1mm, the deflection from the point of lock-up to the maximum test load is 5mm, and the stiffness of STU throughout the force range from lock-up to maximum test load in tension and compression is 7.72% and 3.6% respectively. During the overload test and the fatigue load test, the STU shows no sign of leakage or binding.
Study on Rapid Evaluation of Bearing Capacity of Arch Bridge Structure
Authors: Yan Jing Jing , Wang Cheng Jun , Cui Qing Hai , Jin Xing , Fan Min , Fan Meng
Published: September 2013

This paper introduced a concept of frequency inspection coefficient to find relationship among frequency inspection coefficients of static flexibility, strain and structure dynamic load. Explored this theory resemblance of structure stiffness evaluation which based on frequency inspection coefficient and static flexibility inspection coefficient separately, and verified reliability of this method which aiming at arch bridge via the result of measured static and dynamic test data of sample bridge.
Research of Flow Mechanism and Numerical Simulation on the Post-Prestressed Duct Grouting
Authors: Xu Geng , Yan Ren Jun , She Chang Lian , Xu Lin Zhi , Xu Lin , Li Fen
Published: September 2013

Post-prestressed duct grouting is a complex construction process and it is affected by many factors. Since there are no clear cognitive relations to the influencing factors of the grouting quality, it is hard to make the best control program during the construction. By the theoretical applicability and parameters analysis through the grouting process, this article used the numerical simulation method to analyze the grouting process and obtained the correspondence between the initial velocity, grouting pressure and grouting quality. To the height difference and bending in the duct, the relationship between volume and forming quality were analyzed, the results has reference value to the design of duct gas vent.
Influence of Moving Vehicles on Vertical Vibration of Simply Supported Bridge
Authors: Han Yan , Wang Xiao Dong , Li Chao Qun
Published: September 2013

Euler beam dynamic analysis model under moving loads and wheels plus spring-damper-sprung mass action were established respectively. The simply-supported beam motion control equations were derived and the corresponding simulation analysis procedures were worked out. The vertical dynamic responses of simply-supported bridge under typical vehicles at different speeds were studied systematically. Impact factors calculated from the two analysis model were compared with the values of the current bridge specifications. It is shown that vehicle inertia force has little effect on the vertical deflection and vertical vibration acceleration of the bridge, the vehicle impact effect on bridge gradually go up with the passing speed increasing, vehicle weight has great influence on the vertical vibration of the bridge. The problem of passing overloaded vehicles must be considered seriously in bridge design and use.
Cable Tension Measurement of Cable Stayed Bridge Based on Frequency Method
Authors: Sun Zhi Hua , Yang Ping
Published: September 2013

The frequency method is an indirect method of measuring cable tension, in which using the relation between vibration frequency and cable tension, and measured frequency. It has been found wide use because of its simplicity, practicable use, higher accuracy and the instrument is easy to carry. The principle of the frequency method is based on the vibration theory of string or beam. The flexural rigidity of cable is ignored in string vibration theory, but included in beam vibration theory; therefore the latter is more approaching the engineering practice.
"Cold Bridge" Reconstruction to Optimize Megalopolis' Self-Regulative Thermal Climate Environment
Authors: Gu Xin Yi
Published: September 2013

Atmospheric underlying surface change is the main reason for urban heat island and fog and haze. According to constructing a network-like cold bridge as well as coordinating the layout of urban hard underlying surface and soft underlying surface which can promote urban wind-heat movement, urban thermal climate environment may be improved by diffusing heat and solids effectively. As to suzhou, both city regional natural ecological pattern and main urban areal natural ecological environment structure reflect this philosophy.
Particle Flow Simulation of Slope Instability and Failure
Authors: Fan Yun Yun , Zan Shi Ming , Wan Jiang , Xu Xiao Hui , Song Guo Zheng
Published: September 2013

The instability and deformation process of an example of slope is simulated using PFC here. The relationship between macro and micro mechanics parameters is established in the numerical simulation, which determines the calculating parameters.The results of simulation and the example are consistent assessment, which illustrates the effectiveness of calculation, indicates that the PFC method can search the instability and sliding surface and shows the development process of performance failure. During the process, the chain of parallel bond force fractures gradually, but the range where parallel bond fractures is larger than the instable area because of the sliding friction, which improves our understanding of slope instability.
Structural Design of Newly Developed Temporary Footbridge
Authors: Karmazínová Marcela
Published: September 2013

The paper deals with the design of steel structure of the temporary footbridge, intended especially for the usage in the construction site for pedestrian and bicycle traffic. In the period of last two years, on the authors workplace, in the co-operation with the mounting company, the new type of steel footbridge is being developed. Within this development the attention is, among others, paid to the structural design, in particular to the harmonization of static solution and structural detailing, to achieve the efficient design. In the course of solving this problem, two types of the footbridge are being developed in parallel. Both footbridges are composed as the structures with a lower deck, truss main girders and bracings; the first structure (short footbridge) with a small self-weight may have the span up to 18 m; the second structure (long footbridge) with a normal self-weight may have the span up to 36 m. The paper is focused on the brief description of structural composition and parameters of the short footbridge, as well as structural detailing of the joints of main load-carrying parts. The configuration of the whole structure and individual structural details have been designed with respect to the static, dynamic and fatigue affects, which have been experimentally verified using loading tests of the footbridge prototype with the span of 18 m and fatigue tests of significant structural details.
Progresses and Perspectives of Damage Identification in Bridge Structure
Authors: Wu Xiang Nan , Wang Xiao Guang
Published: September 2013

Structural damage identification is the core of Structural health monitoring system. The paper points out existing damage identification methods and analysis the application status and disadvantages of various methods. The research hotspots are summarized on considering the statistical identification method under uncertainty and the environmental impact of damage identification methods. Aiming at the characters of bridge engineering, the paper points out that a four-in-one multi-system damage identification method is the develop direction for bridge structural damage identification, which is established based on construction, load testing, health monitoring and manual inspection.
Finite Element Model Updating of a Prestressed Concrete Continuous Bridge Based on Dynamic Monitoring
Authors: Xue Gang , Bai Wei Yu , Wang Xian
Published: September 2013

The finite element model modified technique based on optimization principle is benefit for the model updating of the large bridge structures. By the ambient vibration test information provided by health monitoring system of huanghe bridge II in baotou , this article adopted corrected parameter based on structural eigenvalue sensitivity analysis to update the bridge dynamic model.The fundamental vibrational frequency of updated finite element model is more closer to the measured result under ambient excitation, which indicates that the optimization algorithm provided by large-scale general software can carry out the model updating effectively.
Reliability Analysis of Bridge under Multi Adverse Factors
Authors: Xie Hui Bing , Wang Yuan Feng , Liu Ming Hui
Published: September 2013

A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. As critical transportation junction in the transportation network, bridge controls the traffic capacity of the transportation network. In the past decade, collapse of highway bridges caused by natural hazard and human error occur frequently. There are three main reason of collapse: 1) overloading; 2) construction deficiency; 3) imbalance of the system safety. In this paper, a collapsed bridge in Harbin is studied based on probability. A reliability analysis is conducted to investigate the system safety of the case bridge under combined effect of overloading and construction deficiency. Some suggestions for bridge quality control are proposed.
Discussion on Design of Double-Deck Traffic Concrete Box Girder for City Bridge
Authors: Zhu Ming Qiao , Wei Fu Jia , Hu Xiu Lan , Wang Jian Qun
Published: September 2013

For layout space in the limited land resources and improving the utilization efficiency of urban transportation bridge and traffic conditions, in this paper, according to the request of four lanes of roof, two-way urban light rail traffic in the box, considering the requirements of pipeline layout, water supply and drainage, and fire escape, lighting, ventilated at the same time, based on the existing related specification, give full play to the characteristics of the concrete box girder, preliminarily design out of the single box three rooms inclined web box girder for double-deck traffic of urban bridge, in order to provide the reference design.
The Research on Cable Force Measurement Based on Degenerated Element with Frequency Method
Authors: Cui Xin , Jiang Yong , Fu Li Wen , Wang Jin Feng
Published: September 2013

At present, among the methods of cable force measurement, the frequency method is applied extensively for its mature theory and rapid and repeated operation procedure. Based on the theory of frequency method measurement, it generally uses the numerical method with beam element to analysis the parameters of cables under the given conditions. However, the conventional beam element is not able to simulate the bending stiffness in beams section. Therefore, it turns to degenerated beam element to simulate cables and the results agree well with the results based on beam element and formulas calculation, and it provides theoretical basis for the later cable force testing system.
Numerical Analysis of Porous Concrete Base in Asphalt Pavement Based on Traffic Load
Authors: Suo Li Jun
Published: September 2013

Traffic load is important parameter used in the analysis of the new pavement design. However, few studies have done extensive and intensive research on the load stress for asphalt pavement of porous concrete base. Because of that, it is necessary to study the stress of porous concrete base in the asphalt pavement based on traffic load. In the paper, first of all, threedimension finite element model of the asphalt pavement is created for the aim of doing mechanical analysis for the asphalt pavement. And then, the two main objectives of this study are investigated. One is calculation for load stress of porous concrete base, and the other is analysis for load stress of porous concrete base. The results show that load stress of porous concrete base decreases, decrease and increase with increase of bases thickness, surfaces thickness and ratio of bases modulus to foundations modulus respectively.
Experimental Study on the Crack Resistance of Waste Asphalt Concrete Fiber Cement Stabilized Macadam
Authors: Li Hong Bo , Liu Zhan Jiang , Shen Hui
Published: September 2013

mi-rigid base on crack resistance, using orthogonal experimental design method, arranged 16 groups of orthogonal test and conducted the water content test and drying shrinkage test that aimed at various ages from 5d to 50d respectively. The results indicated that with the increasing of waste asphalt content, the shrinkage gradually increasing and the maximum reached when the dosage of waste asphalt concrete was 55%, since then, with the increasing of waste asphalt content, the shrinkage gradually decreasing and the range was largely. Fiber has little effect on moisture loss and shrinkage, with the increasing of fiber content, the moisture loss of materials with different ages increased gradually and the maximum loss rate reached when the dosage of fiber was 4, then the moisture loss decreased gradually after that. As for shrinkage, it reached minimum value when the dosage of fiber was 2.5. Mixing waste asphalt concrete and fiber in reasonable dosage can improve the crack resistance of materials.
Analysis of the Sensitivity of Impact Factors on the Stability of Expansion Freeway Slope
Authors: Luo Gen Chuan , He Zhong Ming , Zhao Xin Tong
Published: September 2013

By analysis its own characteristics of Reconstruction and Extension freeway slope, summary and presents the main factors affecting slope stability; then use orthogonal test method, analysis the result by Range Method, it indicated that the sensibility of impact factors on the Stability of Reconstruction and Extension Freeway Slope was in the following order: the slope angle after excavation, cohesion, weight of soil layer, internal friction angle, the slope angle before excavation, Cable length, Cable spacing.
Evaluation of Impact Factors of Deformity Intersection Capacity in Mountain Cities
Authors: Gao Jing Ru
Published: September 2013

Restricted by terrain, intersections in Mountain cities are always deformity intersections. Based on the researches on deformity intersections in Chongqing, this article establishes basic information database of these intersections, and then select the main impact factors of capacity among these deformity intersections through the evaluation method of principal component analysis, and provides a theoretical basis for study on capacity improvement of deformity intersections in mountain cities.
Study on the Strength and Acid Alkali Erosion of Improved MSW
Authors: Liu Lin , Wu Peng Fei , Jiang Jin Diao
Published: September 2013

Improving MSW with help of the curing agent mixed with cement, fly ash and gypsum. The unconfined compressive strength test is carried out in different conservation age on the improved MSW; Analyzing the increasing mechanism of improved MSW combined with the method of SEM/EDS. Simulating acid alkaline environment with the liquor of H2SO4 and NaOH and studying the rule of acid and alkali erosion of improved materials. The result of experiment show that improved MSW which contain cement, fly ash and gypsum is better than it only mixed with cement; The strength of improved MSW mixed with cement is better than it only have cement ,and improve more in lye.
Effect of Wind Load on the Track Structure of Bridge with High Pier and Large Span
Authors: Hao Liu , Wang Ping , Yan Le , Luo Wei , Chen Rong
Published: September 2013

The high pier and large-span bridge is high, soft, and have large contact area with the outside world, under the action of wind load, it will occur large vertical and horizontal displacement .This displacement effect on the track structure and will cause rail additional force, lateral displacement and create initial track irregularities, and then reduce the lateral stability of track structure. In this paper, through the large finite element software, we build pier-beam-track model to simulate and analyse the influence on the track structure under the vertical and horizontal wind load, it reached the following conclusion: horizontal wind load basic does not cause rail additional force, but reduce the rail lateral stability; longitudinal wind load can make rail produce certain vertical additional force, but compared to the telescopic additional force, the force basic can be ignored.
Gas Tightness Evaluation of Structural Concrete Applied to Nuclear Containment Vessels
Authors: Wu Ye , Shi Liang , Liu Jian Zhong
Published: September 2013

The presence of high-temperature air-steam mixes and their transport is the most important factor controlling the security reliability of nuclear containment vessels during a loss of coolant accident. Total accumulated amount of radioactive substances and their hazards cannot be ignored, although the release process through non-cracked structural concrete is very slow. Through established models of flow through structural concrete of containment vessels, permeability coefficients and leakage rate under steady and accident state are discussed in this paper. Comparison results of tightness show that properties of structural concrete applied to containment vessels should be strictly controlled and regulated.
A Review of Field Occurrence of Crack Types and Crack Coalescence in Rocks
Authors: Wong Louis Ngai Yuen
Published: September 2013

This paper briefly reviews the literature on the general crack formation mechanisms and the typical occurrence of crack coalescence in natural rocks, but with no particular reference to specific locations or geologic settings. The field occurrences of tensile wing cracks, horsetail cracks, anticracks and shear cracks, as well as their coalescence are described. In contrast to the tensile wing cracks which develop in the tensile quadrant, anticracks develop from the pre-existing discontinuities in the compressive quadrant. The discussion will be illustrated with plenty of field examples, supplemented by a review of commonly used terminologies.
Research of Influencing Factor on the Bending Property of Asphalt Mixture Based on Grey Correlation Entropy
Authors: Dong Yuan Shuai , Liu Qing Quan , Cao Dong Wei
Published: September 2013

Since many influencing factors on the bending property of asphalt mixture, in order to explore the various factors on the influence degree of bending property, 16 kinds beam specimens of asphalt mixture, formed by different asphalt binders and different gradations of aggregate, were tested. Then the mechanics parameter such as the bending strength and failure strain were calculated. The influence degree of eight factors on the bending properties was analyzed by the gray entropy method. The result show that asphalt Brookfield viscosity exert significant influence on the maximum bending strain, filler-bitumen ratio and the maximum particle size exert significant influence on the bending strength.
Research on Proportioning Design of Tourmaline Modified Asphalt Mixture
Authors: Wang Xin Qi , Dong Biao , Wang Chao Hui , Wang Xiao Hua
Published: September 2013

In order to study the effect of tourmaline on asphalt mixture design indexes, the optimal asphalt content of modified asphalt mixture with different contents of tourmaline were determined through Marshall Test, and the variation of optimal asphalt content caused by tourmaline was analyzed. The effect of tourmaline on density, porosity, VMA, VFA, stability, flow value were studied. Under the guidance of surface theory and mortar theory respectively, the Marshall Volume indicators of tourmaline modified asphalt mixture were analyzed comparatively. A mix design method for asphalt mixture modified inorganic powder is recommended.
Structural Type Selection of Middle and Small Span Bridges in Seismic Area
Authors: Zhang Xing Chao , Ji Shi Peng , Guo Gui Lin , Wang Xiu Lan
Published: September 2013

In order to study the influence of bearing on the anti-seismic property of medium-small span bridge, based on a continuous beam bridge 5×30 m , the dynamic effects of four kinds of system was analyzed with static analysis and nonlinear time history analysis. The study shows that PTFE slide rubber bearings set at the abutment and laminated rubber bearings set at the piers was the best combinations for seismic.
Study on the Earthquake Resistant Capability of Brick-Timber Structure
Authors: Zhou Qiang , Sun Bai Tao
Published: September 2013

The brick-timber structures have a long history and are still used widely in Chinese rural area at present. A large amount of structures were damaged in Wenchuan earthquake occurred on May 12, 2008, and the brick-timber structures in different intensity regions were investigated in detail. Based on the investigate data of Wenchuan earthquake and other previous seismic data, the typical damage of brick-timber structures are summarized and the earthquake resistant design methods and research status are discussed, the earthquake resistant capability of brick-timber structure are also analyzed. Combined with current country codes, the constructional measures for earthquake resistance and construction technology of brick-timber structures are studied. Finally, some reasonable suggestions on the seismic strengthening and reconstruction of this kind of structure after disaster have been given.
Application of Frictional Energy Dissipation Brace in Seismic Strengthening
Authors: Yang Shun Bin , Song Jing Xu , Pan Wen
Published: September 2013

This paper first introduces two kinds of structural strengthening methods: direct method and indirect method. It is suggested that use frictional energy dissipation braces to reinforce the structure. Taking the reinforced concrete brace with steel-rubber frictional device as an example, the author discusses its strengthening design method. The applications of frictional energy dissipation brace in both domestic and international seismic strengthening are also introduced.
Experimental Research on Seismic Capacity of the Frame Sandwich Boundary Joint
Authors: Zhao Teng Fei , Meng Zhao Bo , Zhao Yong Sheng
Published: September 2013

In the tall building frame structure, the traditional frame joints which are usually constructed with the high strength concrete of the columns bring many difficulties to the construction. The frame joints concreted with beams low grade concrete (named as sandwich joint) is urged intensively by the engineers. The paper introduces the experiment of two full-scale sandwich boundary joints in the middle floor under cyclic load. Based on the test result, the specimens seismic behavior on performance of load-carrying capacity, node deformation, ductility, energy dissipation capacity etc are studied. Through comparison with traditional frame boundary joints, comprehensive seismic performance of sandwich boundary joints does not significantly reduce. The engineering applications of these sandwich frame joints are proved to be feasible, and some suggestions for the engineering application of this joint are proposed.