车桥耦合系统在随机激励下的动力分析及其应用

通过建立随机激励下的车桥耦合系统的空间动力模型,研究了提速条件下上承式钢板梁的加固问题。根据实测的轮对加速度,由时间序列自回归模型生成随机激励作为系统的输入,对列车通过桥梁的全过程进行了计算机模拟,得到桥梁的动力响应,并对计算结果进行了统计分析。根据计算结果,设计了上承式钢板梁桥的加固方案,对实际桥梁进行了加固。在桥梁加固前后分别进行了现场测试,结果证明了本文分析方法的正确性和加固方案的合理性。

DYNAMIC ANALYSIS OF TRAIN-BRIDGE SYSTEM UNDER RANDOM EXCITATIONS

In studying the reinforcement of steel girder bridges in the project of raising train speeds of China抯 railway, a spatial dynamic analysis model for train-bridge systems under random excitations was established. The random excitations were analyzed and generated by the time series auto-regressive model from the experimentally measured wheel accelerations. The whole histories of the train running on bridges were simulated on computer. The responses of bridges were calculated and statistically studied. Based on the results, the reinforcement schemes for steel girders were designed and some of them were applied to real bridges. The field tests were carried out before and after the bridge reinforcement, which validated the effectiveness of the analytical method and the reasonability of the reinforcement schemes.