不对称钢结构连廊实测及TMD减震效应分析

Application of TMD Damping Effect Analysis and Measured Asymmetric Linked Structure of Steel

以某商贸城室外连廊为例,对连廊舒适度进行了研究。介绍了连廊舒适度的特性指标,表明连廊和室内天桥的振动舒适度计算应包括频率和加速度。而加速度常常是引起舒适度问题的主要原因。为了有效研究该连廊,对其进行了实际检测,发现一阶竖向自振频率满足的情况下,加速度不满足导致舒适度问题。分析了实测的结果,由于此连廊两侧主梁长度不相等会产生扭转,然后进行了有限元软件模拟及加装调谐质量阻尼器(turned mass damper,简称TMD)减振模拟,连廊的整体频率特征没有明显变化,但有效降低了结构加速度满足了要求,并且通过调整TMD质量不对称,有效控制了结构扭转。

Linked structure of steel for a outdoor shopping mall is taken as an example,the comfort of this structure is studied. The characteristics of the linked structure comfort index show that the calculation of vibration comfort for linked structure and indoor overpass should include frequency and acceleration,and the acceleration is the key problem for comfort. In order to study effectively the linked structure,by actual testing,it is found that when the first-order vertical natural frequency of vibration is available,but acceleration couldn＇t reach the comfort. since the main girder＇s lengthes on both side of linked structure are not equal,so it could be twisted. The finite element software simulation and vibration simulation equipped with turned mass damper（TMD） are carried out.The results show that the whole frequency characteristics of linked structure have no obvious change,but the acceleration of structure is reduced efficiently and satisfied the requirements,and the torsion of the structure is controlled effectively by adjusting the asymmetric quality of TMD.