隔震支座在房屋顶部加层改造中的应用

Application of Isolation Bearings in Storey-adding on the Roof

对于顶部加层改造,如果将新加层当作质量块,通过铅芯橡胶支座或者摩擦摆支座提供调谐刚度和阻尼,便形成了控制水平向震动的调谐质量阻尼器(TMD)。传统的刚性加层方式会增加下部结构的地震响应,采用隔震支座后的新加层反而对下部结构具有减震的效果。本文用实例工程对比了不加层、刚性加层和采用铅芯橡胶支座、摩擦摆支座加层后结构的地震响应,并从理论上分析了两种隔震支座对结构震动衰减的影响因素。

In the case of storey-adding on the roof,the new storey can be treated as the mass of a TMD.And then the TMD,playing a role of earthquake absorption in the horizontal direction,is reasonably formed if provided the tuned stiffness and damping,namely,by means of rubber bearing or friction pendulum bearing.The new storey will reduce the vibration response of the substructure if setting bearings,whereas the response will increase using the conditional methods.Comparisons of damping effects with different methods(such as none storey-adding,traditional storey-adding,storey-adding with rubber bearing and friction pendulum bearing)have then conducted.Additionally,the influence factors of these two bearings are analyzed theoretically.