
混合形状记忆合金及屈曲约束支撑系统自复位抗震研究
Self-centering earthquake-resistance of hybrid shape memory alloy and buckling-restrained brace system
In the present paper, a hybrid self-centering device is proposed, which consists of both the shape memory alloy (SMA) and buckling-restrained brace (BRB). In this hybrid self-centering device, the BRB play a role in dissipating seismic energy while the SMA provides the self-centering function to decrease the residual deformations. Based on the commercially available finite-element software package ABAQUS, a user-defined material mechanical behavior subroutine (SMA-UMAT) is firstly established for one-dimensional phenomenological constitutive model of SMA. Low cyclic analysis and dynamic elasto-plastic seismic analysis of the steel frames with BRBs and hybrid self-centering devices, referred respectively to as BRBF and SC-BRBF, are then implemented with resorting to ABAQUS with SMA-UMAT. Numerical results show that with respect to BRBF, the SC-BRBF can decrease the residual deformations by more than 50%, though in a certain extent, magnifying the peak interstorey drift ratios (IDRs), peak base shear, and peak floor accelerations (PFAs). Therefore, the present hybrid self-centering device has certain engineering application prospect for large span structures and the zones of high seismic fortification intensity.
地震 / 自复位 / 形状记忆合金 / 屈曲约束支撑 / 低周反复分析 / 动力弹塑性地震反应分析 {{custom_keyword}} /
earthquakes / self-centering / shape memory alloy / buckling-restrained brace / low cyclic analysis / dynamic elasto-plastic seismic analysis {{custom_keyword}} /
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