Influence of central buckle on suspension bridge dynamic characteristics and driving comfort  

作　　者：王达 邓扬 刘扬 

机构地区：[1]School of Civil Engineering and Architecture, Changsha University of Science & Technology

出　　处：《Journal of Central South University》2015年第8期3108-3115,共8页中南大学学报（英文版）

基　　金：Project(2015CB057701)supported by the National Basic Research Program of China;Projects(51308071,51378081)supported by the National Natural Science Foundation of China;Project(3JJ4057)supported by the Natural Science Foundation of Hunan Province,China;Project(12K076)supported by the Open Fund of Innovation Platform in Hunan Provincial Universities,China;Project(2015319825120)supported by the Traffic Department of Appliced Basic Research,China

摘　　要：The central buckle, which is often used in a suspension bridge, can improve bridges' performance in the actual operation condition. The influence of the central buckle on natural vibration characteristics and bridge-deck driving comfort of a long-span suspension bridge is studied by using a case study of Siduhe Suspension Bridge in China. Based on the finite element software ANSYS and independently complied program, the influence of the central buckle on the structure force-applied characteristics of a long-span suspension bridge has been explored. The results show that the huge increases of natural frequencies can result in the presence of central buckles because of the increases of bending and torsional rigidities. The central buckle basically makes the stiffening girders and cables within the triangular area covered as a relatively approximate rigid area. Hence, the central buckle can reduce the torsional displacement of the main girder. However, the increases of bending and torsional rigidities have little influence on the impact factor, which is obtained by using vehicle-bridge coupled vibration analysis. This means that the central buckle has little effect on the comfort indices. In addition, it is found that the central buckle can enhance the bridge deck's driving stability due to the decrease of the torsional displacements of the main girder.The central buckle, which is often used in a suspension bridge, can improve bridges＇ performance in the actual operation condition. The influence of the central buckle on natural vibration characteristics and bridge-deck driving comfort of a long-span suspension bridge is studied by using a case study of Siduhe Suspension Bridge in China. Based on the finite element software ANSYS and independently complied program, the influence of the central buckle on the structure force-applied characteristics of a long-span suspension bridge has been explored. The results show that the huge increases of natural frequencies can result in the presence of central buckles because of the increases of bending and torsional rigidities. The central buckle basically makes the stiffening girders and cables within the triangular area covered as a relatively approximate rigid area. Hence, the central buckle can reduce the torsional displacement of the main girder. However, the increases of bending and torsional rigidities have little influence on the impact factor, which is obtained by using vehicle-bridge coupled vibration analysis. This means that the central buckle has little effect on the comfort indices. In addition, it is found that the central buckle can enhance the bridge deck＇s driving stability due to the decrease of the torsional displacements of the main girder.

关 键 词：suspension bridge central buckle dynamic characteristic separation method impact factor 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]