某人行桥抗震性能研究

Study on the Seismic Behavior of a Pedestrian Bridge

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。论文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。研究结果表明,该桥抗震性能较好。

Pedestrian load is the exciting source of pedestrian bridge.When the displacement,velocity and acceleration of pedestrian bridge are too large,pedestrians will stop or leave because of extreme discomfort.Therefore,the normal performance of the structure is the main consideration in the dynamic design of pedestrian bridge,and the peak acceleration is the important parameter for measuring comfort.The basic principle of pedestrian bridge vibration and the research status of response spectrum method are introduced.The probabilistic response spectrum with certain guaranteed rate is introduced and applied to engineering examples.The peak acceleration is calculated and the comfort of the pedestrian bridge is compared and evaluated.The results show that the seismic performance of the bridge is good.