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车流-桥耦合系统的随机响应分析

DOI: 10.13197/j.eeev.2014.02.79.zhangp.011, PP. 79-85

Keywords: 桥面不平顺,车桥耦合系统,车流,随机振动,边界条件

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Abstract:

将车辆简化为两自由度移动系统,考察在不同边界条件下,实际车流作用时由桥面不平顺引发的车桥耦合系统的随机响应。运用演变随机过程的一般理论,结合状态空间理论和模态分析法,推导得出车桥耦合系统的演变随机响应。通过数值算例,对比分析不同边界条件对车桥耦合系统随机响应的影响,讨论了速度与桥面等级变化时桥梁跨中位移均方根响应的变化规律。以本文所给车列为荷载,存在一个使跨中位移均方根响应峰值突然减小的速度临界值,该临界值的大小与边界条件和桥面等级无关。

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