新型自复位耗能剪力墙的数值模拟

Numerical Simulation of a New Self-centering Energy-consuming Shear Wall

为了提高剪力墙体系的耗能能力和复位能力,增强剪力墙结构震后可恢复性,提出一种新型自复位耗能剪力墙,该新型剪力墙在墙肢连梁中段断开安装耗能阻尼器,在墙角处开设水平缝,提供摇摆。介绍了新型自复位剪力墙的构造以及设计方法。通过非线性数值模拟,建立了新型自复位耗能剪力墙的精细有限元模型,并且以轴压比、单片墙肢预应力筋根数、预应力筋间距为分析参数,建立了6个数值分析模型,结果表明,墙肢轴压比的降低可以减小模型的残余变形,当轴压比为0.4时,最大残余变形率仅为4.5%;相比于SW4,当预应力筋增加一半时,残余位移减小了65.8%,因此,通过减小构件轴压比以及增加预应力筋来减小新型自复位耗能剪力墙的残余变形,提高复位能力的效果是显著的。

In order to improve the energy dissipation and reset capacity of the shear wall system and enhance the recoverability of the shear wall structure after earthquake,a new type of self-centering energy-consuming shear wall is proposed,which disconnects and installs energy-consuming dampers in the middle of the limb connecting beams,and make a horizontal slit at the corner of the wall to provide the rocking.The construction of the new self-centering shear wall as well as the design method are presented.The fine finite element model of a new self-centering energy-consuming shear wall is established by nonlinear numerical simulation,and six numerical analysis models are established with axial pressure ratio,number of prestressing tendon roots in a single wall limb,and prestressing tendon spacing as the analytical parameters.The results show that the reduction of axial pressure ratio of the wall limb can reduce the residual deformation of the model,and when the axial pressure ratio is 0.4,the maximal residual deformation rate is only 4.5%.Compared with the SW4,when the prestressing tendon is increased by half,the residual displacement was reduced by 65.8%.Therefore,the effect of reducing the residual deformation of the new self-centering energy-consuming shear wall and improving the resetting capacity by decreasing the axial pressure ratio of the member as well as increasing the prestressing tendons is significant.