Coupling Vibration Study of Wind-train-track-bridge System

摘要

A coupling dynamic analysis model of wind -vehicle-track-bridge (WTTB) system is presented in this paper in the time r domain. The WTTB system can be divided into four subsystems : wind subsystem,train subsystem,track subsystem and bridge r subsystem. Fluctuating wind velocity and track irregularities are the excitations for the WTTB system. The WTTB system is r connected by the wheel -rail interaction, track-bridge interaction, wind-bridge interaction and wind-train interaction. In r order to improving the calculation efficiency while retaining considerable accuracy , an explicit implicit hybrid dynamic r integration method is introduced and a computational program WTTBDAS is developed. The proposed framework is finally applied r to vehicles moving on the railway long -span bridge under in cross-wind. The seven particular wind loads cases are included r The dynamic respon ses of bridge and train subsystem is analyzed and discussed under different cases ,respectively, the r steady and unsteady wind forces have significant influences on the dynamic responses of WTTB sys -tem.