DYNAMIC PERFORMANCE OF HIGHWAY-RAILWAY COMBINED BRIDGES UNDER MONORAIL TRAINS AND VEHICLES
Highway-railway combined bridges carrying both monorail trains and vehicles are a new transportation system with a lot of advantages to solve traffic problems in small urban areas, seashore cities and mountain cities. This paper presents a framework for dynamic analysis of coupled monorail train-vehiclebridge system in time domain. The monorail train and the road vehicle are modeled as mass-spring-damper systems respectively and the bridge is represented by spatial finite element model based on conventional finite element method. A 15 degrees-of-freedom dynamic model is built for a monorail train, while, a 7 degree-of-freedom dynamic model is adopted for a road vehicle. The surface roughness of bridge decks and monorail tracks are simulated and introduced to this framework. Then the governing equation of motion of coupled monorail train-vehicle-bridge system is assembled using fully computerized approach. The dynamic performances of Caiyuanba Bridge which has the longest main span of 420m carrying both monorail trains and road vehicles are investigated as a case study. Displacements and accelerations of the bridge as well as monorail trains and road vehicles are studied when vehicles, monorail trains and monorail trains-vehicles pass through the bridge respectively. The results demonstrate that monorail trains have more effect on dynamic responses of the bridge than road vehicles. Dynamic responses of monorail trains and vehicles change slightly, while, dynamic responses of the bridge have obvious changes when monorail trains, vehicles and monorail trainsvehicles move on the bridge respectively. Finally the integral rigidity of the bridge can be estimated using the obtained results. This approach can also be used to carry out dynamic analysis of the monorail train or the road vehicle with other longer span bridges.
monorail Highway-railway combined bridge road vehicle spatial vibration
Wen-Hua Guo Hai-Tao Liu Xue-Tong Si
School of Civil Engineering and Architecture, Central South University, Changsha 455131, P.R. China Department of Civil Engineering, The University of Hong Kong, Hong Kong, P.R. China
国际会议
广州
英文
905-911
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）