This paper introduces a novel viscoelastic self-centering brace with a rotational displacement amplification function (VSB-RA), developed to address the issue of limited energy dissipation in traditional self-centering braces. The basic structure and working mechanism of the VSB-RA are detailed. Low-cycle reciprocating loading tests were performed on two types of VSB-RA specimens with different initial amplification angles, and a comprehensive analysis was conducted on their bearing capacity, energy dissipation performance, self-centering capability, and frequency correlation. A refined finite element model was developed in ABAQUS software to simulate the complete test loading process. Nonlinear dynamic time history analysis is then performed on an 8-story reinforced concrete (RC) frame structure with the VSB-RAs using different initial amplification angles. The results demonstrate that the hysteresis curves of the VSB-RA exhibit distinct flag-shaped characteristics and excellent self-centering performance, and its energy dissipation capacity increases exponentially with the decrease of the initial amplification angle. The numerical simulation results of the hysteresis curves align well with experimental findings. The inter-story drift, residual inter-story drift, floor acceleration, and base shear force are effectively controlled in the VSB-RA frame structures compared to the uncontrolled structure. Under rare earthquake actions, the base shear forces of the structure are reduced by 27.2 %, 27.9 %, and 30.7 % at initial amplification angles of 45°, 37.5°, and 30°, respectively.

中文翻译：

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旋转位移放大粘弹性自定心支撑力学性能研究及其在钢筋混凝土框架中的应用


本文介绍了一种具有旋转位移放大功能的新型粘弹性自定心支撑（VSB-RA），旨在解决传统自定心支撑中能量耗散有限的问题。详细介绍了VSB-RA的基本结构和工作机制。对两种不同初始放大角的VSB-RA试件进行低周往复加载试验，对其承载能力、耗能性能、自定心能力和频率相关性进行综合分析。在 ABAQUS 软件中开发了精细的有限元模型来模拟完整的测试加载过程。然后使用不同初始放大角度的 VSB-RA 对 8 层钢筋混凝土 (RC) 框架结构进行非线性动态时程分析。结果表明，VSB-RA的滞回曲线表现出明显的旗形特征和优异的自定心性能，其耗能能力随着初始放大角的减小呈指数增加。迟滞曲线的数值模拟结果与实验结果非常吻合。与非受控结构相比，VSB-RA框架结构的层间位移、残余层间位移、楼板加速度和基础剪力得到了有效控制。在罕见地震作用下，初始放大角为45°、37.5°和30°时，结构基础剪力分别降低了27.2%、27.9%和30.7%。