Research on Dynamic Characteristics of Roadbed-Bridge Transition Section with Ballastless Tracks
A semi-infinite tri-dimensional spatial timing coupled dynamic FEM model of a bridge of high speed railway with ballastless tracks is established to analyze roadbed-bridge transition section. Influences of wheels loads, vehicles speeds, frequencies, irregularities and material parameters on the dynamic responses of the system are studied systematically. The results are stated as following: the dynamic responses are direct ratio to the wheels weight; the vertical displacements, speeds and accelerations on the top of the tracks decrease quickly while through the CA layer; the amplitudes of the dynamic responses on the top of the tracks are about 10~12 times as much as that on the top of the roadbed filled with graded crushed stone; the dynamic responses amplitudes keep declining at the zone of 0→7~8m away from bridge abutment, while the values increase almost linearly, displaying a downward W shape; when speed is up to 250km/h, the dynamic responses on the transition section have nothing to do with the speed; the amplitudes of the dynamic responses on the top of the tracks and roadbed are mainly ascertained by static wheels loads, excitation forces of medium and high frequencies; the spring-damping properties of fastener rubber pads system and CA layer have great influence on the dynamic characteristics of the track structure and roadbed system. Dynamic properties of the track and roadbed can he improved by reducing the stiffness of the fastener-rubber pad structures or increasing the thickness of the CA layer.
Ballastless track Transition section Finite element analysis Dynamic response characteristics
Zhenhui Fan Yonghe Wang Qixiang Qing
School of Civil Engineering and Architecture, Central South University, Changsha 410075, China College of Mechanical and Automotive Engineering, Hunan University, Changsha 410082, China
国际会议
南京
英文
912-919
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）