某拱索支撑人行桥人致振动响应分析及控制

发布时间：2018-04-21 19:06

  本文选题：拱索支撑人行桥 + 人行荷载　； 参考：《建筑结构》2017年S1期

【摘要】：随着人行天桥逐渐向大跨度、轻柔化和桥型新颖别致的方向发展,由此引发的人致振动的问题日益突出。以某拱索支撑人行桥为研究对象,建立空间有限元模型研究其动力特性;选取IABSE推荐的人行荷载模型,考虑非活动人群的质量,采用时程分析法对该桥进行人致振动作用下舒适度的分析;根据Den Hartog提出的不考虑主结构阻尼的最佳阻尼器参数表达式得到阻尼器的设计参数,并在人行桥合适的部位设置调谐质量阻尼器(TMD)进行振动控制。结果表明:该人行桥具有明显的竖向振型,且该振型的频率与人行步频十分接近;采用TMD进行振动控制后,共振激励作用下的竖向加速度减小80%~90%,并且满足规范中对人行桥舒适度的要求;在考虑非活动人群质量的影响后,TMD的减振效果更好。
[Abstract]:With the gradual development of footbridge to the direction of long span, soft and novel bridge type, the problem of human vibration is becoming more and more prominent. Taking a footbridge supported by arch cable as the research object, the spatial finite element model is established to study its dynamic characteristics, and the pedestrian load model recommended by IABSE is selected to consider the mass of inactive people. The time history analysis method is used to analyze the comfort of the bridge under the action of human vibration, and the design parameters of the damper are obtained according to the optimal damper parameter expression proposed by Den Hartog, which does not consider the damping of the main structure. A tuned mass damper (TMD) is installed to control the vibration of the footbridge. The results show that the bridge has obvious vertical mode, and the frequency of the mode is very close to the walking frequency, and the vibration is controlled by TMD. The vertical acceleration under resonance excitation is reduced by 80 / 9090 and meets the requirements of comfort of footbridge in the code. The effect of TMD is better after considering the influence of the mass of inactive people.
【作者单位】： 同济大学建筑工程系;
【分类号】：U441.3;U448.11
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本文编号：1783728