关于弯剪型特性的底部隔震剪力墙结构计算方法研究

Research on calculation methods for base⁃isolated shear wall structure with bending scissor characteristics

底部隔震剪力墙结构在强震作用下具有弯剪型侧移曲线的特性,采用铁木辛柯梁模拟底部隔震的剪力墙结构在隔震后的动力特征和隔震效应。推导了底部隔震悬臂梁模型在地震中的动力特征,提出了延长周期、减少高阶振型参与质量系数和增加体系阻尼比是隔震技术减震的三大因素,指出了增加结构阻尼可有效地提高长周期高层结构的隔震效果,同时隔震可降低复杂高层结构高阶振型的影响。

The base⁃isolated shear wall structure has bending scissor characteristics lateral displacement curve under the action of strong earthquake.Timoshenko beam was used to simulate the dynamic characteristics and isolation effect of the base⁃isolated shear wall structure after seismic isolation.The dynamic behavior of the base⁃isolated cantilever beam in earthquake was deduced,it is proposed that prolonging the period,reducing the participation mass coefficient of high⁃order mode shapes and increasing the damping ratio of the system are the three major factors of vibration isolation technology.It is pointed out that increasing the structural damping can effectively improve the seismic isolation effect of long⁃period high⁃rise structures.Seismic isolation can also reduce the earthquake effect of higher modes for the complex high⁃rise structure.