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20 June 2008, Volume 27 Issue 3 Previous Issue    Next Issue

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Analysis on Static and Lateral Stability of Cable Bridge Construction LIU Qi, ZHOU Shui-xing, CHEN Zhan-rong 2008, 27(3): 335-337.  Abstract ( )   PDF (243KB) ( )   Cable bridge is a type of suspension bridge which depends on the wire rope to suffer the external force.The spatial computation model of a cable bridge was established by the finite element program MIDAS.The static results were in good agreement with that of the test.Reckoning in the geometric stiffness of the rope,the spatial lateral stability of the bridge was analyzed and diverse measures were put forward to improve its lateral stability.After comparing with these methods,the best measure was proposed.The analysis approach and the conclusion are useful for the design and construction of the cable bridge. Related Articles | Metrics

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Analysis on Hyper Static Axial Force in Long Multi-span prestressed Concrete Continuous Box Beam Bridge XIAO Xing-xing, WAN Chong-wen, LI Cheng-hua 2008, 27(3): 338-344.  Abstract ( )   PDF (543KB) ( )   As to long multi-span prestressed concrete continuous girder bridge in cantilever casting construction,when the closure strands is pulled,the pre-applied force in the closure strands compresses beam body to cause the lateral deformation,and one side bearing-friction resistance at closure-mouth will restrain beam body to avoid the lateral deformation,therefore the pre-applied force hyper static axial force is generated.Hyper static axial force,which is a kind of hyper static internal forces just like hyper static moment,is representd generally as tensile force in post tensioned members.From the aspect of bending or cracking resistance capacity,hyper static axial force would make a disadvantageous effect on the post tensioned concrete structures.Based on a 14 cross long multi-span prestressed concrete continuous girder bridge in cantilever casting construction,hyper static axial force resulting from each cross closure strand is calculated.Then the principle,distribution characteristic of the hyper static axial force,as well as the measure of reducing hyper static axial force are discussed.Finally on the base of rorms,pre-applied force hyper static axial force is considered to increase.The formula which is used to design the right section anti-moment and the anti-crack checking for multi-span continuous girder bridge is proposed. Related Articles | Metrics

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Welding Stress Dynamic Simulation Analysis on Extra-thick Plates in Steel Bridge WANG Lin, ZHANG Jiang-ping, WANG Yan-bo, LIU Xiu-wei 2008, 27(3): 345-348,428.  Abstract ( )   PDF (412KB) ( )   The theoretical analysis of welding stress in extra-thick plates has been concerned.Based on ANSYS,using Gauss heat source model heating and element of birth and death,dynamic simulating is used in analysing the butt welding process of 80 mm extra-thick plates.The multi-welding of heating temperature field is simulated,achieving the weld dynamic generation and tracking the changes of the stress field.Simulation results gear with Guanyinyan Yangtze River Bridge welding test results.It offers a useful reference for the design and production of the extra-thick plates. Related Articles | Metrics

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Semi-analytical Solution for Longitudinal Vibration of Elastic Supporting Pile YU Wen-jin 2008, 27(3): 349-352,378.  Abstract ( )   PDF (319KB) ( )   By using a soil modeling of three axes symmetry and considering three dimensions wave effect,the pile's longitudinal vibration characteristic is analyzed on condition of elastic supporting.The frequency domain response of the pile head,complex stiffness and mobility can be obtained as well.According to the convolution theorem and Fourier inversing transforms,a semi-analytical solution of time domain response of velocity admittance is obtained on condition of a stimulating force of a half sine pulsation. Related Articles | Metrics

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Calculating Method of Ultimate Capability of Steel Tube Filled in Concrete Column with Pressure and Moment ZHAO Yu, XIANG Zhong-fu, YANG Hu-gen 2008, 27(3): 353-355.  Abstract ( )   PDF (192KB) ( )   Basic mathematical knowledge is used to deduce the formulas of the column with pressure and moment.According to mechanical theory,ultimate capability of steel tube filled in concrete column with pressure and moment is calculated.Based on the above method,the engineering software Matlab is used to design the program.Some questions are expounded,such as how to divide section,how to modify the parameters,how to judge the limited load,and how to search the value of ultimate capability.Compared with the result of experimentation,the computed results through the program can satisfy the needs of practice. Related Articles | Metrics

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Application and Research of Internal and External Prestressing in the Large Span Continuous Ridge-Frame Bridge LIU Yong-ke, ZHANG Xue-song, XIANG Zhong-fu, SHI Peng-cheng 2008, 27(3): 356-359,391.  Abstract ( )   PDF (404KB) ( )   In view of cracks in the webs and deflections in the middle of span widespreadly existing in the current large span continuous ridge-frame bridge,the Xitan Qijiang bridge has been taken as an example,and a new prestressing system——the internal and external prestressing technique has also been introduced.The right bridge is designed with internal and external prestressing,whereas the other one is designed with internal prestressing.The results of two bridgos have been compared to gain the differences in suffering.From aspects of controling ramp cracks,repressing deflections in the middle of span and economy,the advantages of the internal and external prestressing technique have been discussed. Related Articles | Metrics

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Brief Introduction to the Core Concrete's Empty Influence on the Mechanical Performance of Concrete Filled Steel Tube Components YANG Shi-cong, WANG Fu-min, QU Ping 2008, 27(3): 360-365,486.  Abstract ( )   PDF (677KB) ( )   The research of the core concrete's empty which influences the mechanics performance of concrete filled steel tube components is a hot issue currently.Aiming at the core concrete's filled status of the concrete filled steel tube arch bridge which has been on operation for six years in southwest,through the similitude model trials and theoretic analysis,the core concrete's empty influence on the mechanics performance of concrete filled steel tube components is briefly introduced.It offers referces to the design,construction and examination of this kind of bridge. Related Articles | Metrics

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Analysis on Stability of Concrete Filled Steel Tube Arch Bridge in Construction QIU Lin, SUN Ji-biao 2008, 27(3): 366-369.  Abstract ( )   PDF (294KB) ( )   The linear and nonlinear buckling analysis on stability are introduced.Then according to an concrete filled steel tubular arch bridge,some aspects in construction about stability were discussed.Rational filling method for concrete filled steel tube and some temporary safety facilities in construction can increase the coefficients of stability.The nonlinear influence must be considered in the analysis of stability of concrete filled steel tubular arch bridge in construction. Related Articles | Metrics

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Random Dynamic Response Analysis on Construction Platform Based on Wave Force ZHOU Dan, XIAO Sheng-xie, DU Feng-bin 2008, 27(3): 370-373,412.  Abstract ( )   PDF (415KB) ( )   According to the construction platform of Qingdao Gulf Bridge,finite element programming was used in different frequencies.The calculated dynamic responses was considered to be the excitation from various directions in the action of irregular wave force.The influence of the excitation from various directions on the random dynamic response was analyzed.The results show that the main mode shape of twist is played when excited from 45° direction.Dynamic response experiences two peaks.The calculation results of static and dynamic were compared.The results show that the dynamic influence of the wave force should be considered during designing construction platform. Related Articles | Metrics

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Forecast Analysis of Bridge Life in Southwest China LIN Bin, ZHENG Dan, ZHOU Jian-ting, PENG Li-wei, XU Bin, DAI Yang, HU Zhi-quan 2008, 27(3): 374-378.  Abstract ( )   PDF (355KB) ( )   With bridge in service aging gradually,it is more and more important to evaluate its reliability and forecast its life for better strengthening and rebuilding bridge.According to the difference of information from structure service and management,the residual life of bridge in service in Southwest China is forecasted by regression method,grey theory and neural network model.Experimentd results are also calculated by these methods.Research results mentioned aboae can be used to provide more scientific warrant for strengthening and rebuilding bridge engineering. Related Articles | Metrics

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Progress and Developing Trend of Cable Stress Measuring Methods of Bridge JIANG Jian-shan, TANG De-dong, ZHOU Jian-ting 2008, 27(3): 379-382,466.  Abstract ( )   PDF (485KB) ( )   Four stress measurement methods of large bridge cable are discussed,including tension instrument showing,tension sensing measuring,vibrating frequency sensor and electro-magnetic strain sensor.The basic principles,merits and demerits of these four methods are discussed.In addition,both sensor structure of magnetic-elastic stress sensor and real application in bridges are dissertated.Finally,developing trend of cable stress measurement methods and key technologies are proposed. Related Articles | Metrics

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Research on Discount Rule of External Water Pressure for Highway Tunnel CHEN Lin-jie, JIANG Shu-ping, DING Hao 2008, 27(3): 383-386,404.  Abstract ( )   PDF (353KB) ( )   In order to solve technical problems of external water pressure for highway tunnel,thirty six tests are made under different conditions including different water head height,permeability coefficient,discharge amount and drainage system with own designed apparatus by similar theory.According to test results,discount rule of external water pressure is analysed.Furthermore,some cognitions are also pointed out,which include that the similar relation of water head height is square relation on engineering analogy and composite backfill method is introduced to deal with abundant water cavities around tunnel. Related Articles | Metrics

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Calculating Principle of Tunnel in Debris Flow's Structure WANG Lin-feng, TANG Hong-mei, CHEN Hong-kai 2008, 27(3): 387-391.  Abstract ( )   PDF (334KB) ( )   The most effective way to go through the large-scale debris flow's sedimentary region is the tunnel in debris flow.The key point of the tunnel in debris flow's calculation is how to define the load case.The main differences of structure calculation is the tunnel in debris flow bears the pound of debris flow.When the debris flow breaks out,tunnel in debris flow has two cases.One is deposition,and the other is flush.We can calculate the tunnel in debris flow's internal force by structure mechanics.At the same time,we must consider the tunnel's longitudinal stability,because the tunnel is lay in the debris flow. Related Articles | Metrics

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Research on the Ventilation System of Extra-long Yangjiao Tunnel