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本文以某城市桁架桥主体结构为背景,通过设计TMD减振方案,使桥梁的振动满足相关规范设计要求。全文在桁架有限元模态计算结果基础上,加载调谐质量阻尼器(TMD)装置,并计算行人荷栽作用下结构的动力时程响应,最后对安装TMD装置的桥梁进行现场振动测试,通过对比减振前后桥梁的加速度响应结果,显示本工程安装TMD装置后桥梁的阻尼比提高10倍左右,振动峰值减小60%左右。证明采用TMD减振技术可以使桥梁满足人群激励下的舒适度要求,起到良好的减振效果。
In this paper, the main structure of a city truss bridge as the background, through the design of TMD damping program so that the bridge vibration to meet the relevant normative design requirements. Full text Based on the finite element modal calculation results of truss, the tuned mass damper (TMD) device is loaded and the dynamic time-history response of the structure under pedestrian load is calculated. Finally, the on-site vibration test of the bridge with TMD device is carried out. The results of acceleration response of the bridge before and after damping show that the damping ratio of the bridge after the TMD installation is increased about 10 times and the peak value of the vibration is reduced by 60%. It is proved that using TMD vibration damping technology can make the bridge meet the crowd comfort incentive requirements and play a good damping effect.