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目前人行桥这种结构形式正向轻柔、大跨度的发展方向,这决定了由于行走引起的结构振动问题对行人舒适度的影响将愈来愈显著。本文首先简述了行走激振力的数学模型,然后通过蒙特卡罗法,分析了人行桥在四种人行荷载工况下的振动问题,最后通过对一座既有钢结构人行桥的动力测试试验,一方面说明了采用蒙特卡罗法模拟分析行人行走激励下人行桥的振动问题具有可行性,另一方面也说明了行人行走激振力引起的人行桥侧向振动同样应当引起足够的重视。这些无论对于结构设计还是对既有桥的减振处理都具有很好的实际意义。
At present, this kind of structural form of footbridge is developing in a gentle and long-span direction, which determines that the impact on structural comfort of pedestrians due to walking will be more and more significant. In this paper, the mathematical model of walking exciting force is briefly introduced. Then the vibration problem of footbridge under four kinds of pedestrian loads is analyzed by Monte-Carlo method. Finally, the dynamic test of one existing steel structure pedestrian bridge On the one hand, it is feasible to simulate the vibration of footbridge under pedestrian walking stimulus by using Monte Carlo method. On the other hand, it also shows that lateral vibration of footbridge caused by pedestrian walking excitation force should also be paid enough attention. These are of great practical significance both for structural design and for damping of existing bridges.