大跨度人行桥舒适性分析和TMD减振设计

Comfort Analysis and TMD Vibration Reduction Design of Long-span Footbridge

随着对景观要求的提高,人行桥向着轻柔和大跨度方向发展。目前,我国规范对人行桥舒适性评价标准并不适合大跨度人行桥。通过研究对比国内外相关规范,推荐采用德国人行桥设计指南进行舒适性评价。而对于无法满足舒适性要求的人行桥需要采用一定的减振措施,如广泛采用的减振措施--调谐质量阻尼器(TMD)的设计方法。同时以一座百米级桁架梁桥为例,采用时程分析方法,按照德国人行桥设计指南对桥梁舒适性进行评价,并采用TMD进行减振处理,分析结果表明减振效果显著。

With the improvement of landscape requirements,the footbridge is developed towards the flexible and long-span direction.At present,the comfort evaluation standard of footbridge in China is not suitable for long-span footbridge.By studying and comparing the relevant specifications at home and abroad,the footbridge design guideline of German is recommended to evaluate its comfort.Some vibration reduction measures are necessary to take for the footbridges hard to meet the comfort requirements.For example,the design method of vibration reduction measures-tuned mass damper(TMD)is widely adopted.At the same time,taking a 100-m truss girder bridge as an example,the time-history method is used to evaluate the comfort of the footbridge according to the footbridge design guidelines of German,and TMD is used for the vibration reduction.The analysis result shows that the effect of vibration reduction is remarkable.