南太湖主地标商业联桥舒适度设计及减振控制分析

Analysis of comfort design and vibration reduction control of commercial pedestrian bridges of main landmark of South Taihu

依据《建筑楼盖结构振动舒适度技术标准》(JGJ/T 441-2019),采用MIDAS Gen软件对南太湖主地标商业建筑中的联桥进行了舒适度分析,详细介绍了舒适度分析方法以及荷载工况、人群密度、外荷载频率、踏步对联桥舒适度的影响。研究了TMD阻尼器对联桥舒适度的控制效果。结果表明:联桥竖向舒适度分析时,可采用局部模型,横向舒适度分析时,应采用整体模型;联桥具有明显的小阻尼比单自由度体系振动特征,外荷载频率对舒适度分析具有决定性影响;踏步对结构频率的影响有限,不应过分考虑其有利作用,仅当能够较大地改变结构频率,使其远离最不利的人行频率范围时,增大结构刚度才是有益的;对于一般联桥,STMD就能起到良好的控制效果,无需采用MTMD。

The MIDAS Gen software were used to analyze the comfort of pedestrian bridges of the main landmark of South Taihu according to the Technical standard for vibration comfort of building floor structures(JGJ/T 441-2019).The analysis method of comfort design and the influence of load condition,crowd density,external load frequency and stair step on the comfort of pedestrian bridge were introduced in detail.The control effect of TMD damper on the comfort of pedestrian bridge was studied.The analysis results show that the local model can be used for the vertical comfort analysis of the coupling,and the overall model is recommended for the lateral comfort analysis;the pedestrian bridge has obvious small damping ratio and single degree of freedom system vibration characteristics,and the external load frequency is effective for comfort analysis has a decisive influence;the influence of stair step on structural frequency is limited,and its beneficial effects should not be over⁃considered,but only when large changes are possible and when the structural frequency is far away from the most unfavorable pedestrian frequency range,it is beneficial to increase the structural rigidity;for general pedestrian bridges,STMD can play a good control effect,without MTMD.