COUPLING MECHANISM OF WIND-VEHICLE-BRIDGE SYSTEM FOR LONG CABLE-STAYED BRIDGES
In a wind-vehicle-bridge (WVB) system, there are various interactions among wind,vehicle and bridge. The mechanism for coupling vibration of wind-vehicle-bridge systems is explored in this paper to demonstrate the role of each factor, such as mean wind, fluctuating wind, buffeting,rail irregularities, light rail vehicle vibration and bridge stiffness. A long cable-stayed bridge which carries light rail traffic is regarded as a numerical example in this paper. Firstly, a finite element model is built for the long cable-stayed bridge. The deck can generally be idealized as three dimensional spine beam while cables are modeled as truss elements. Pylons and pies can be regarded as beam element. The truss elements with rigid arms are used to reduce the DOFs of the FEM model.Vehicles are modeled as mass-spring-damper systems. Rail irregularities and wind fluctuation are simulation in time domain by spectrum representation method. Then, aerodynamic loads on vehicle and bridge deck are measured by section model wind tunnel tests. Eight vertical and torsional lutter derivatives of bridge deck are identified by Weighting Ensemble Least-Square method. Finally,dynamic responses of the WVB system are analyzed in a series of cases. The comparison of responses of bridge and vehicles are carried to show the possible interactions among wind, vehicle and bridge.The importance of each factor is also discussed on the basis of calculation results. Some conclusions are included, which clarify the mechanism of wind-vehicle-bridge systems to some extent.
Wind-vehicle-bridge system Cable-stayed bridge Aerodynamic loads Coupled vibration
Yong-Le Li Ming-Jin Zhang Bin Wang Kai Zhao
Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031,Sichuan, P. R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
1722-1727
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）