摇摆墙刚度对框架摇摆墙结构抗震性能的影响分析

Influence of rocking wall stiffness on seismic behavior of frame rocking wall structure

为研究摇摆墙刚度对框架摇摆墙结构抗震性能的影响,对1个4层钢筋混凝土框架结构模型,用有限元软件SAP2000对附加不同刚度的摇摆墙结构进行了静力非线性分析。分析结果表明:随着摇摆墙刚度的增大可以逐渐改善框架的抗震性能,使框架变形更加均匀,层间位移角更趋于一致。但刚度增加到一定程度后,其值进一步增大时结构的抗震性能趋于稳定。对于本文的结构模型摇摆墙与框架的刚度比小于1.27%时,对框架的破坏机制影响很小。摇摆墙的刚度比大于2.48%时,开始改变框架的破坏机制,逐渐从层破坏机制变为整体破坏机制。摇摆墙的刚度比大于6.81%时,结构具有稳定的整体破坏机制。

In order to study the influence of rocking wall stiffness on seismic behavior of frame rocking wall,this paper conducts a static nonlinear analysis of a four- story reinforced concrete frame structure model attaching different stiffness rocking walls by use of the finite element software SAP2000. The results showe that： with increase of the rocking wall stiffness,the seismic performace of the frame structure is gradually improved,the deformation of the frame is more uniform,and drift angle tends to be more consistent. But to certain extent of rigidity,a further increase of its value will stabilize the seismic performance of structures. When rocking wall to frame stiffness ratio less than 1. 27%,it is only a small effect on the failure mechanism of the framework. For the ratio greater than 2.48%,it began to change the failure mechanism of framework,from story failure mechanism to overall failure mechanism gradually. Once the ratio greater than 6. 81%,structure has a stable overall failure mechanism.