当前摇摆墙体系研究广泛，但由于放松了墙底约束，抗侧刚度减小，使得结构整体变形过大。在框架剪力墙双重结构体系中，利用剪力墙和框架在地震作用下不同的变形模式，在两者之间连接屈曲约束支撑（BRB）可有效降低框架结构的水平加速度响应；而本文则进一步在剪力墙底设置参数可控的金属阻尼器（MD），防止剪力墙底部破坏的同时，整体结构在BRB与MD共同作用下，整体结构地震响应也得到有效改善。本文以某六层混凝土框架剪力墙为例，利用ABAQUS有限元软件并结合UMAT二次开发接口的PQ-Fiber用户子程序，建立了框架剪力墙非线性有限元模型，变化BRB和MD初始刚度和屈服强度，进行弹塑性动力时程分析。结果表明：在BRB和墙底MD的双重耗能作用下，当BRB和MD屈服强度取值一个合适的属性范围，双重耗能框架剪力墙结构的地震响应得到了明显改善。
Abstract
Rocking wall system has been widely studied, but due to the relaxation of the wall bottom constraint, the anti-side stiffness decreases, resulting in the overall deformation of the structure too large, not meeting the security requirements. In order to solve this problem, the buckling restrained brace（BRB）can yield without buckling under the action of tension and pressure, then the BRB is used as the connecting member of the frame and the wall, and metallic damper (MD) is set at the bottom of the wall to double control the structural deformation of the lower limit value, enhance the energy dissipation of the structure and reduce the seismic response of the structure. In this paper, a six-story concrete frame-shear wall, for example, using the finite element software ABAQUS and combined with UMAT secondary development interface of PQ-Fiber user subroutine, established the frame-shear wall structure model, the framework of different yield strength BRB rocking wall to wall with different stiffness of metallic damper model, through dynamic elastic-plastic time history analysis, to study the seismic performance of the structure. The results show that the seismic response of the frame rocking wall structure is greatly improved under the control of the double energy dissipation element of BRB between the frame and the shear wall and MD at the shear wall base, and which are in a proper range of properties.
关键词
双重耗能 /
框架剪力墙结构 /
摇摆墙 /
屈曲约束支撑 /
金属阻尼器 /
抗震性能
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Key words
the double energy dissipation mechanism /
burial structure system；rocking wall /
buckling-restrained brace /
metallic damper /
seismic performance
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