To improve the energy dissipation capacity of steel slit shear walls made of thin plates and mitigate the adverse effects from the large out-of-plane deformation and potential local buckling failure, a novel laminated steel slit (LSS) shear wall assembled from two single-layer steel slit (SSS) shear walls is proposed in this study. First, the theoretical analysis method for predicting the shear strength and stiffness of the LSS shear walls is proposed. To validate the theoretical method as well as investigate the hysteretic performance of the LSS shear walls, two specimens made from different materials, common carbon steel and low yield steel, are designed and tested experimentally under quasi-static cyclic loading. Refined finite element models are developed to simulate the hysteretic behaviors of the LSS shear walls, which show good agreement with the test results. Further, the performance differences between the LSS shear walls and SSS shear walls are analyzed using the validated numerical simulation approach. The strength and stiffness of the LSS shear walls are greater than the summation of the individual SSS shear walls, attributed to the interaction between the different layers in the LSS shear walls. The energy dissipation efficiency of the LSS shear walls is improved and the stiffness degradation is effectively delayed, thanks to the incorporation of the low yield steel material. Finally, to evaluate the effects of the contributing factors on the seismic performance of the LSS shear walls, a series of parametric analyses are performed. Parametric analysis results show that the use of the low yield steel helps to improve the ductility and energy dissipation capacity of the LSS shear walls and delay the stiffness degradation. A large link width ratio, small link length ratio and large link thickness ratio can all contribute to a large strength, stiffness and absolute energy dissipation of the LSS shear walls, but the former two at the same time deteriorate the stiffness degradation.

中文翻译：

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低屈服强度钢叠合剪力墙的研究

为了提高薄板钢缝剪力墙的耗能能力，减轻大的面外变形和潜在的局部屈曲破坏的不利影响，一种由两个单层钢板组装而成的新型叠层钢缝剪力墙（LSS）剪力墙本研究提出了分层钢缝（SSS）剪力墙。首先，提出了预测LSS剪力墙抗剪强度和刚度的理论分析方法。为了验证理论方法并研究LSS剪力墙的滞回性能，设计了由不同材料（普通碳钢和低屈服钢）制成的两个试件，并在准静态循环荷载下进行了实验测试。开发了精细的有限元模型来模拟 LSS 剪力墙的滞回行为，结果与试验结果吻合良好。此外，使用经过验证的数值模拟方法分析了 LSS 剪力墙和 SSS 剪力墙之间的性能差异。 LSS 剪力墙的强度和刚度大于各个 SSS 剪力墙的总和，这归因于 LSS 剪力墙中不同层之间的相互作用。由于低屈服强度钢材的加入，提高了LSS剪力墙的耗能效率，有效延缓了刚度下降。最后，为了评估影响因素对 LSS 剪力墙抗震性能的影响，进行了一系列参数分析。参数分析结果表明，低屈服强度钢的使用有助于提高LSS剪力墙的延性和耗能能力，延缓刚度退化。大的连杆宽度比、小的连杆长度比和大的连杆厚度比都有助于LSS剪力墙较大的强度、刚度和绝对耗能，但前两者同时会加剧刚度下降。