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15 October 2007, Volume 26 Issue 5 Previous Issue    Next Issue

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Seismic Response Analysis of Long-Span CFST Deck--Type Arch Bridge ZHAO Can-hui ，ZHOU Zhi-xiang 2007, 26(5): 1-4.  Abstract ( )   PDF (279KB) ( )   Seismic response behaviors of long-span concrete filled in steel tube(CFST)deck-type arch bridge were investigated.The free vibration specialty between half-through CFST arch bridge and CFST deck-type arch bridge was contrasted.The seismic response behaviors of CFST deck-type arch bridge subjected to longitudinal excitation，vertical excitation and lateral excitation were analyzed by time-history analysis method.The effect of multi-support excitation was also discussed，and the seismic response specialty was contrasted between CFST deck-type arch bridge and CFST half-through arch bridge. References | Related Articles | Metrics

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Analysis of Shrinkage and Creep on Self-Anchored Suspension Bridge HU Jian-hua ，TANG Mao-lin ,LIU Rong ，WANG Zhong-bin 2007, 26(5): 5-8.  Abstract ( )   PDF (285KB) ( )   Because the self-anchored suspension bridge adopts reinforced concrete or prestressed concrete members and its cables are anchored on the stifening girder，the shrinkage and creep of stifening girder and bridge tower will induce the changes of internal forces of cables and hangers，which results in the redistribution of action efects and reactions and the transformation of structure state.So the influence of concrete shrinkage and creep must be taken into account in the design of stmcture.The initial strain method was adopted to deduce the finite element expression of shrinkage and creep efects on the structure while taking the age of loading into account，and a programme was compiled by FORTRAN.Taking Pingsheng Bridge of Guangdong as an examples，the analysis of shrinkage and creep on self-anchored suspension bridge was carried on after bridge finished. References | Related Articles | Metrics

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Effect of Diaphragm on Distortion of Steel Box Girder LIU Xiao-yu，SUN Tong-ling 2007, 26(5): 9-12.  Abstract ( )   PDF (233KB) ( )   When applying the load onto the girder，its section may be distorted，and the girder may lead to partial flection，web plate crumple，and so on due to the reason that the top plate，bottom plate and web plate of the steel box girder are very thin.In that case，in order to improve the carrying capacity of the steel box girder，itg better to set enough stifening rib in the box girder.The distort efect of the diaphragm on the steel box girder was discussed. References | Related Articles | Metrics

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Application of Neural Network Method to Parameters Identification of Shibanpo Bridge in Chongqing LI Xi，GU An-bang，QIAO Wei-guo 2007, 26(5): 13-16.  Abstract ( )   PDF (275KB) ( )   With the capacity of adaptive self-study，non-linear representation，good robusticity and error tolerance as well as rapid convergence，BP neural network could efectively solve the core problem of parameters identification in the construction of continuous rigid flame bridge.Through the example，a conclusion is drawn that the result of parameters estimation using BP network is very identical with the measure，which has practical significance with satisfactory accuracy.If the accuracy in the classic method is rather low especially in problems with non-linear and uncertain system control and SO on，the BP neural network can be used well. References | Related Articles | Metrics

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Determination of Cable Forces in Completion State with ANSYS WANG Wei-sheng,ZHAO Rong-gao,LI Feng-hui 2007, 26(5): 17-20.  Abstract ( )   PDF (205KB) ( )   A comprehensive method to determine cable forces was put forward.The cable forces in completion state was determined with the method using the APDL in ANSYS.There Was little diference between the forces and designed results. References | Related Articles | Metrics

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Spatial Simulation Analysis of PC Continuous Rigid Frame Bridge Construction WANG Yun-tao，WANG Wei-hong，CHEN Yu-feng，GU An-bang 2007, 26(5): 21-24.  Abstract ( )   PDF (263KB) ( )   The box girder bridge is a spatial structure resisting a combination of tension，compression，bending，shear，and torsion forces，whose deformation and stress are very complex，especially in the long-span PC continuous rigid frame bridges. The authors have achieved the spatial simulation analysis of the construction of the Baiguodu Jialing River Bridge，which is located at Hechuan in Chongqing.Under the secondary development in ANSYS program.It's very useful in further understanding the similar bridge's actual stress distribution. References | Related Articles | Metrics

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Analysis of Bridge Impact Coefi cient Influence Factor and the Deviation Formation WANG Hai-cheng，SHI Shang-wei 2007, 26(5): 25-28.  Abstract ( )   PDF (231KB) ( )   The influence factors of vehicles impacting the bridges are complicated.At present，it rather dificult to solve the problem just by theory analysis.Before the analyzing method based on the probability theory accomplishing and the statistice work according on the coeficient finishing.it's better to adopt the experiment to reflect the results approxinately through expe- riential“impact coefficient”formula.In terms of a dynamic test upon a typical arch bridge，the imfluence factors that cause the exceptional impact coefficient are analyzed and discussed，the reasons why there is obvious diference between the measured value and standard one are discussed，with the hope to give some useful reference. References | Related Articles | Metrics

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Anti-Seismic Analysis and Anti—Seismic Measures for Yuxi Bridge GUO Xiang-ming，XIAO Sheng-xie，SUI Yan-chun，HAO Yan-guang 2007, 26(5): 29-31.  Abstract ( )   PDF (155KB) ( )   The model for Yuxi bridge was constructed on the basis of ANSYS.The research for the dynamic characteristics was made by mode analysis.Taking the arch crown and quarter section of the arch ring as key sections，by exerting Taft seis- mic wave on the bridge，the stress，displacement and the maximal moment of key sections were computated by the time-history analysis and the TMD equipment was used to reduce the seismic intensity. References | Related Articles | Metrics

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Probability-Based Bridge Deterioration Model and Maintenance Strategy Relations SHAO Xu-dong ，LIU Xin-hua ，LIU Dai-quan ，PENG Jian-xin 2007, 26(5): 32-36.  Abstract ( )   PDF (328KB) ( )   Bridge structure resistance always reduces as time goes by under atmospheric attacks，and its performance deteriorates gradually in the service time.The non-linear exponential deterioration model of reliability index and the non-linear deterioration modd of condition index were proposed.They could reflect the higher mode change rule in the deteriorated process.A series of formulas of reliabihty index and condition index were derived by considering two different cyclical preventive maintenanee strategies.The interaction between the bridge reliability index and condition index was investigated.This work can be taken as basis for bridge life assessment and prediction.and for making reasonable maintenance decisions. References | Related Articles | Metrics

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Concrete Creep Coeficient Fitting and Conjugate Gradient Method Solving ZHOU Shui-xing ，LI Feng-hui ，CHEN Shan-lin 2007, 26(5): 37-39.  Abstract ( )   PDF (161KB) ( )   According to the creep characteristic of concrete，the exponential function was selected as base function，which could construct the prevalent Diriehlet series so as to fit creep coeficient．For the actual variables more than unknown ones， conjugate gradient method Was adopted to solve the equations．Furthermore，the creep experiment data from reference were fitted by this method．The results showed that the fitted values were in good agreement with the experimental data．At last， the choice method of initial value in Dirichlet series was discussed． References | Related Articles | Metrics

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Stability Analysis of Concrte—Filled Steel Tube Arch Bridge in Construction Stage XIAO Guang-hong ，ZHANG Qiu-1ing 2007, 26(5): 40-43.  Abstract ( )   PDF (205KB) ( )   The model of Yonghe Bridge was built and the comparison between linear analysis an d non-·linear analysis was con-· ducted by the software MSC Nastran．The results show that it is practical to evaluate the stability of the concrete-filled steel tube arch bridge with non-linear analysis． References | Related Articles | Metrics

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Study on Construction Orders of Simply Supported-Continuous System MA Wen-yan，XIANG Zhong-fu，CHEN Shan-qin 2007, 26(5): 44-48.  Abstract ( )   PDF (306KB) ( )   The constructing procedure of the monolithic layer and the wet joints of the girders and the orders of straining the pre·stress force are the key orders of the simply supported-continuous system．The orders of the monolithic layer and the wet joints of the girders are studied with practical project，and a limited element model was established to analyse the order of the wet joints of the girders and straining pre-stress force to the structure．Through the contrasting analysis，an elementary discus- sion of mechanics and construction Was made towards the prc·-stress simply supported·-continuous system with the hope to better serve the pmject． References | Related Articles | Metrics

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Evaluation of Cutting and Tunnel Alternative for Freeway Project through Red-Bed Soft Rock Region in Western China LIU Yan ，WU Guo-xiong ，ZHU Xiao-rong ，LIU Jian-feng 2007, 26(5): 49-52.  Abstract ( )   PDF (273KB) ( )   Considering the engineering performance of the red-bed soft rock，based on a wide investigation and a technical and economic study of existing freeway project in several provinces in western China red-bed soft rock area，a comprehensive evaluation indicator system was established for cutting and tunnel ahernative assessment with gray relational analysis method． The objective of the research is mainly to get the critical height between cutting and tunnel in order to determine which alternative could be used rationally between cutting and tunne1．The result provides helpful reference for decision-making in freeway design and construction in red-bed soft rock area along a cutting segment．