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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BS 5400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。
The numerical method is used to study the dynamic amplification factor of a suspension bridge and the vehicle-bridge coupling vibration analysis system under the random traffic flow is improved. The simulation technology of multi-thread road roughness is established. The equations of motion of the multi-axle vehicle model are deduced, and the new vehicle dynamics model is embedded into the vehicle-bridge coupled vibration analysis system under random traffic flow. The simulation technology of multi-thread related road surface roughness is studied, The leaf transformation improves the efficiency of the harmonic synthesis simulation. Finally, the impact effect of the bridge under traffic flow is analyzed, and the influence of the vibration coupling effect of the vehicle-bridge coupling is discussed. The results show that the impact effect of the suspension bridge is obvious under the effect of traffic flow, and the coupling effect causes a certain phase difference of the vibration response, but the coupling effect does not cause a substantial increase of the amplitude of the main beam. The dynamic amplification factor of the suspension bridge should refer to British BS 5400 or Canada OHBDC .1982 norms of the relevant provisions of the value; speed has a significant impact on power amplification factor.