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行人荷载是人行桥的激振源,当人行桥梁振动的位移、速度、加速度过大时,行人会因为极度不舒适而停下脚步或离开,因此人行桥的动力设计主要考虑的是结构的正常使用性能,其中,峰值加速度是衡量舒适度的重要参数。介绍了人行桥振动的基本原理以及反应谱方法的研究现状,引入具有一定保证率的概率性响应谱,并将其应用于工程实例,计算其峰值加速度,进而进行舒适度对比评价,为城市人行桥的设计计算提供了一种简单方便的方法。
Pedestrian load is the excitation source of footbridge. When the displacement, speed and acceleration of pedestrian bridge vibration are too large, pedestrians may stop or leave due to extreme discomfort. Therefore, the design of pedestrian bridge is mainly considering the normal structure Performance, of which peak acceleration is an important parameter to measure comfort. The basic theory of vibration of footbridge and the research status of response spectrum method are introduced. Probabilistic response spectrum with a certain guaranteed rate is introduced and applied to engineering cases to calculate the peak acceleration. Then the comparison of comfort is made. Bridge design calculation provides a simple and convenient method.