串联隔震结构震损倒塌动态模型分析

建立了叠层橡胶隔震垫与地下室悬臂RC柱组成的串联隔震结构的有限元分析模型,编写了利用MSC.MARC软件生死单元二次开发UACTIVE程序来模拟隔震垫的失效,并分析了远场多维地震激励下不同长细比悬臂柱柱顶加连梁对结构响应的影响,同时分析了设置阻尼器控制隔震层位移后的结构地震响应。分析表明:通过生死单元二次开发程序可以有效地模拟隔震垫破坏;实际工程中常规的长细比悬臂柱柱顶加连梁对串联隔震结构的响应影响微小;隔震层增设非线性阻尼器可以控制位移且不影响多遇地震下的隔震效果。

Dynamic Model Analysis for Collapse of the Serial Isolation Structure under Near-fault Earthquake Excitations

Analysis model of the serial isolation structure is established,which consists of laminated rubber bearing(LRB) mounted on top of basement column.User subroutine of MSC.MARC to simulate LRB damage is written.The influence of link beam which on top of basement column with different slenderness ratio under near-fault earthquakes is analyzed,and seismic response of the serial isolation structure with damper in isolation layer is analyzed.Analysis shows that the isolation layer damage preferably simulates through wrote user subroutine birth-death element.The link beam to the influence of structural response is minimal in general engineering.When nonlinear damper is installed in the isolation layer,not only be good for effectively reduce displacement,but as well not influence isolation effect of the serial isolation structure under frequent earthquakes.