小高层结构屋顶保温层TMD减震分析

A Seismic Analysis of Using Thermal-insulating Roof as TMD in Small High-rise Buildings

提出了利用小高层结构屋顶保温层和铅芯橡胶支座作为TMD装置来达到减震的设想.通过SAP2000有限元软件利用动力时程分析方法对其减震效果进行了分析.结果表明,该屋顶保温层TMD装置可有效降低结构的动力响应,其中控制后结构的楼层位移和楼层加速度的平均值降低了约20％,层间位移平均值降低了30％左右,层间剪力平均值减小了约20％～30％.利用小高层结构屋顶保温层和橡胶支座作为结构的减震控制系统具有一定的可行性和实用性.

China is an earthquake prone country; earthquakes endanger people＇s lives and cause destruction of property.Therefore,researchers have raised serious concern on the seismic performance of buildings and how to improve them.Since the last century,the structural vibration control technology has been widely studied both within the country and abroad.Tuned mass dampers （TMDs） are one of the applications of passive control techniques that have good shock absorbing functions in earthquake engineering and can effectively protect buildings and internal facilities.With the development of the housing industry,small high-rise buildings have become common.In order to improve the seismic performance of high-rise structures and achieve the desired reliability and validity of the damping design,the concept of a roof insulation layer and lead rubber beating as a TMD device is proposed.Compared to the traditional TMD,a roof insulation layer TMD has advantages in terms of structuring and installation.In order to study the damping effect of the new TMD control device,a small high-rise building having a roof insulation layer and lead rubber bearing as the TMD device,is studied.In this paper,the damping effect of the TMD device is analyzed using a dynamic time history analysis method with the SAP2000 finite element software.The results show that the roof insulation TMD device can effectively reduce the dynamic response of structures.The displacement and acceleration of the floor decreased by about 20 ％,the inter storey displacement; decreased by about 30 ％,and the interlaminar shear force decreased by 20 ％～30 ％ on an average.Therefore,using a roof insulation layer and lead rubber beating,a feasible and practical damping system can be obtained for small high-rise buildings.