某大跨度结构楼盖振动舒适度分析与控制

Vibration Comfortable Analysis of Long-span-structures Floors

为分析与控制某大跨度结构楼盖振动舒适度,以某项目为案例,采用Midas/gen软件进行了有控结构(TMD)和无控结构的舒适度分析,并针对有控结构进行敏感参数分析。分析结果表明:该结构楼盖竖向刚度较小,人行激励下,楼板加速度响应较大,采用TMD减振技术后,楼板加速度响应得到有效降低,减振率最高达70.5%,平均减振率约为54.12%;结构频率的一半或者三分之一可能引起结构的多阶共振,分析设计时应进行重点关注;TMD的分散或集中布置对减振率的影响较小,为方便起吊和安装建议,适当分散布置。TMD频率与楼面竖向振动频率误差越大,相对减振率越小,为确保TMD充分发挥作用,建议TMD生产前应进行结构频率测试,结合测试结果进行TMD的设计和生产。

Based on a long-span-structures engineering backgroud,analyses of vibration comfortable and sensitive parameters have been done by Midas/gen software.The results showed that when the crowed excitation was act on the floors,the response of acceleration of floors would be bigger than the comfortable limit of code.The response of the floors added the TMD decreased obviously,the average and maximal rate of vibration mitigation were 54.12% and 70.5% separately.Half and one-third of vertical frequency which may cause Multi-Level resonant.Separate arranged need to be focused on during comfortable analysis TMD was easy to lift and fix without affecting damping ratio of TMD and floors.For taking a full function of TMD,frequency was proposed to do before the production of TMD.