Seismic vulnerability analysis of a high‐rise steel frame structure equipped with novel displacement‐amplified viscoelastic dampers

Mao Ye, Linyi Yang, Yinghou He, Weihao Li
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Abstract

SummaryThe energy dissipation capacity of conventional viscoelastic dampers (VEDs) cannot be fully exerted due to the relatively small inter‐story displacement of building structures. Thus, a novel VED with a displacement amplification mechanism based on the lever principle is developed in this study to achieve small displacement but high energy dissipation ability. First, the structural layout of an amplified viscoelastic damper (AVED) system is briefly introduced, and then the displacement amplification effect is described in detail. According to the working principle of the AVED and the relationship of force and geometric displacement in an actual frame structure, the restoring force theoretical formula of the corresponding amplified damper is derived. Based on the restoring force of the AVED and in combination with the secondary development function of the ABAQUS unit, a VUEL subroutine suitable for the explicit algorithm is programmed with the FORTRAN language. Then, the correctness of the subroutine is verified through a comparative analysis of the ABAQUS simulation and theoretically calculated results. Consequently, the vulnerability analysis of a high‐rise steel frame structure is conducted by using the incremental dynamic analysis (IDA) method, and the influence of the AVED on the seismic performance of the steel frame structure is quantitatively analyzed from the perspective of probability statistics. The analysis results show that compared with the VED structure, the failure probability of the AVED‐2 and AVED‐3 structures reaching the ultimate failure state at all levels is reduced by approximately 43% and 57%, respectively, and the collapse margin ratio (CMR) of structures under large earthquakes is increased by approximately 35% and 68%, respectively. This indicates that the AVED structures with displacement‐amplified dampers have a better effect on the seismic stability of tall steel frame structures under random seismic excitations. This study aims to provide comprehensive information for the seismic‐resistant design of tall buildings in earthquake‐prone regions.
配备新型位移放大粘弹性阻尼器的高层钢框架结构的地震脆弱性分析
摘要由于建筑结构的层间位移相对较小,传统粘弹性阻尼器(VED)的消能能力无法充分发挥。因此,本研究开发了一种基于杠杆原理的具有位移放大机制的新型粘弹性阻尼器,以实现小位移但高消能能力的目标。首先,简要介绍了放大粘弹性阻尼器(AVED)系统的结构布局,然后详细说明了其位移放大效果。根据 AVED 的工作原理以及实际框架结构中力与几何位移的关系,推导出相应放大阻尼器的恢复力理论公式。根据 AVED 的恢复力,结合 ABAQUS 单元的二次开发功能,用 FORTRAN 语言编写了适合显式算法的 VUEL 子程序。然后,通过对 ABAQUS 仿真结果和理论计算结果进行对比分析,验证子程序的正确性。随后,利用增量动力分析(IDA)方法对高层钢框架结构进行了易损性分析,并从概率统计的角度定量分析了 AVED 对钢框架结构抗震性能的影响。分析结果表明,与 VED 结构相比,AVED-2 和 AVED-3 结构在各级达到极限破坏状态的破坏概率分别降低了约 43% 和 57%,结构在大地震下的倒塌裕度比(CMR)分别提高了约 35% 和 68%。这表明在随机地震激励下,带位移放大阻尼器的 AVED 结构对高层钢框架结构的抗震稳定性具有更好的效果。本研究旨在为地震多发地区高层建筑的抗震设计提供全面的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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