PROBLEMS AND COUNTERMEASURES IN THE CALCULATION OF LATERAL VIBRATION OF TRAIN-BRIDGE TIME-DEPENDENT SYSTEM

摘要

Three fundamental problems in the calculation of lateral vibration of train-bridge time-dependent system (hereinafter referred to as the system) are expounded in this paper. That is, (1) Proper solution to lateral vibration of the system cannot be obtained by establishing separate lateral vibration equation groups of the car and the bridge; (2) The exciting source of lateral vibration of the system has not been made definite; (3) It is difficult to carry out the random analysis of vibration of the system as the theory of the random vibration analysis for the system has not been established. The countermeasures to solve these problems are introduced in detail as follows: (1) Establishing the lateral vibration equation group of the system to solve the problem of the non-guaranteed uniqueness of the solution of the equation group for the lateral vibration of the system; (2) Determining the exciting source of the lateral vibration of the system according to the homogeneous nature of the lateral vibration equation group of the system; (3) Establishing the theory of random energy analysis of lateral vibration of the system to solve the problem of the random analysis of the lateral vibration of the system. Six cases concerning the lateral vibration of train-bridge time-dependent system are calculated according to the countermeasures. The field test results are well responded, which demonstrates the correctness and effectiveness of our thinking and methods presented in this paper