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Experimental and numerical study on seismic behavior of obliquely stiffened steel plate shear walls with openings

机译：带孔斜加筋钢板剪力墙抗震性能的试验与数值研究

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摘要

To study the influence of frame-to-plate connections and oblique channel-shaped stiffeners on the seismic behavior of steel plate shear walls (SPSWs), cyclic quasi-static tests were carried out on two one-bay two-story specimens. One specimen was diagonally stiffened with two rectangular openings, and the other was multi obliquely stiffened with one rectangular opening. The bearing capacity, ductility, degradation characteristics, and energy dissipation of two specimens were analyzed. Furthermore, following the test program, the stress distribution, deformation and fracture tendency of the two specimens were simulated by the finite element (FE) software ABAQUS and validated by the experimental results. The experimental results show that the channel shaped stiffeners make full use of the larger flexural and torsional stiffness and improve the bearing capacity, stiffness, and elastic buckling load of the structures. Moreover, the oblique stiffeners have an obvious bracing effect, so the web of the middle beam is subjected to shear yield at the opening segment, which is similar to the link in the eccentrically braced frame. The inelastic mechanism is transferred from the steel plate to the link. In the plastic stage of the structure, the stiffened plate is basically elastic, and the seismic energy is mainly consumed by the link. Therefore, this kind of steel plate shear wall needs to consider the additional effect of the stiffeners on the boundary elements. The reasonable design of the link segment enables the frame to have enough strength to support the stiffened plate as well as avoid premature yielding at the link.
机译：为了研究框架到板的连接以及倾斜的槽形加劲肋对钢板剪力墙（SPSW）的抗震性能的影响，对两个单层两层楼高的标本进行了循环准静态试验。一个样品对角线加劲有两个矩形开口，另一个样品多斜向加劲有一个矩形开口。分析了两个试样的承载能力，延展性，降解特性和能量耗散。此外，按照测试程序，用有限元软件ABAQUS模拟了两个试样的应力分布，变形和断裂趋势，并通过实验结果进行了验证。实验结果表明，槽形加劲肋充分利用了较大的挠曲和扭转刚度，提高了结构的承载力，刚度和弹性屈曲载荷。此外，倾斜的加劲肋具有明显的支撑作用，因此，中梁的腹板在开口部分受到剪切屈服，这类似于偏心支撑框架中的连杆。非弹性机制从钢板传递到连杆。在结构的塑性阶段，加劲板基本上是弹性的，地震能量主要被链节消耗。因此，这种钢板剪力墙需要考虑加劲肋对边界元素的附加影响。链节的合理设计使框架具有足够的强度来支撑加劲板，并避免链节过早屈服。

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