大跨钢箱梁人行桥振动响应分析与MTMD减振控制

发布时间：2018-06-17 12:00

本文选题：人行桥 + 人行荷载　；参考：《结构工程师》2017年04期

【摘要】：人行桥的自振频率与行人步频接近时,容易发生人桥共振,本文以一频率处于行人步频范围内的大跨钢箱梁人行桥为例,考虑了随机行走、结伴行走和跳跃等11种荷载工况,研究了各工况人行荷载激励下人行桥的竖向振动响应,并针对不满足舒适度要求的工况,采用多调谐质量阻尼器(multiple tuned mass damper简称MTMD)对人行桥进行减振控制。结果表明,人行桥在无控状况下产生了较大的振动响应,其竖向加速度超过舒适度限值要求,而当在人行桥加装MTMD系统后,其振动响应大幅降低,减振效果达到70%以上,实现了人行桥在人行荷载激励下的舒适度控制要求。
[Abstract]:Pedestrian bridge resonance is easy to occur when the vibration frequency of pedestrian bridge is close to pedestrian step frequency. In this paper, an example of a large span steel box girder bridge with a frequency in the range of pedestrian frequency is taken as an example. The vertical vibration response of a pedestrian bridge under different working conditions is studied, considering the 11 load conditions of random walking, accompanied walking and jumping. A multi tuned mass damper (multiple tuned mass damper for short) is used to control the vibration damping of the pedestrian bridge. The results show that the pedestrian bridge has a larger vibration response under the uncontrolled condition, and its vertical acceleration exceeds the limit of the comfort degree, and the vibration response of the bridge is when a MTMD system is installed on a pedestrian bridge. The damping effect should be reduced to more than 70%, thus achieving the comfort control requirements of pedestrian bridge under pedestrian load excitation.
【作者单位】：广州大学土木工程学院;
【基金】：国家自然科学项目(51378135,51408140) 教育部博士基金(20134410120003) 广州市科技计划项目(201510010291,152020011) 广东省教育厅(2015KTSCX108)
【分类号】：U441.3

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