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实际交通流作用下的车-桥耦合振动研究

, PP. 80-87

Keywords: 桥梁工程,悬索桥,数值仿真,车-桥耦合,车辆荷载谱,路面粗糙度

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Abstract:

?采用数值方法研究某悬索桥的动力放大系数,完善了公路随机车流下的车-桥耦合振动分析系统,建立了多线程路面粗糙度的模拟技术。推导了多车轴车辆模型的运动方程,并将新的车辆动力学模型嵌入到随机车流下的车-桥耦合振动分析系统中,研究了多线程相关路面粗糙度的模拟技术,并利用快速傅里叶变换提高谐波合成模拟的效率,最后分析了车流作用下大桥的冲击效应,探讨了车-桥耦合振动效应的影响。结果表明:车流作用下,悬索桥的冲击效应明显,耦合效应使振动响应产生了一定相位差,但耦合效应没有引起主梁振幅的大幅增加;悬索桥的动力放大系数宜参照英国BS5400规范或加拿大OHBDC.1982规范的相关规定进行取值;车速对动力放大系数有显著影响。

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