摘要
为避免人行桥发生共振,以新金牛(岛型)公园C、D地块人行斜拉桥为例,通过数值仿真和脉动试验得到了人行斜拉桥的一阶自振频率.进一步地,选取人行激励荷载,确定舒适度评价标准.最后,数值分析了原桥的振动响应,并根据原桥动力分析结果设计了调谐质量阻尼器(TMD)减振方案.研究结果表明:本桥端跨的一阶竖弯频率为2.73 Hz,跨中频率为1.51 Hz;安装TMD后,端跨和跨中的加速度峰值符合舒适度标准,TMD减振效果最大可达到60%.
In order to avoid the resonance of the pedestrian bridge,taking the pedestrian cable-stayed bridge in plots C and D of the Xinjinniu(island-type) Parkas an example,the first-order natural frequency of the pedestrian cable-stayed bridge is obtained through the numerical simulation and pulsation tests Further,the pedestrian excitation load is selected,and the comfort evaluation standard is determined.Finally,the vibration response of the original bridge is numerically analyzed,and a tuned mass damper(TMD)vibration reduction design is designed according to the dynamic analysis results of the original bridge.The research results show that the first-order vertical bending frequency of the end span of the bridge is 2.73 Hz,and the mid-span frequency is 1.51 Hz After installing the TMD,the acceleration peaks of the end span and the middle span meet the comfort standard,and the maximum vibration reductioneffect of the TMD canreach 60%.
作者
戚志河
陈玉珂
王裕滔
李植良
刘蕊
QI Zhihe;CHEN Yuke;WANG Yutao;LI Zhiliang;LIU Rui
出处
《城市道桥与防洪》
2022年第7期59-62,共4页
Urban Roads Bridges & Flood Control
关键词
人行斜拉桥
舒适度
调谐质量阻尼器
减振
pedestrian cable-stayed bridge
comfort
tuned mass damper
vibration reduction
