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Development of a new partially restrained energy dissipater: Experimental and numerical analyses

机译:新型部分约束耗能器​​的开发:实验和数值分析

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Energy dissipaters constructed in structures play an important fuse-type role in concentrating damage and protecting the primary structure. A stable hysteretic behavior, easy fabrication and a low cost are expected characteristics of high-performance energy dissipaters. Previously studied energy dissipaters have disadvantages such as difficult grouting, insufficiently hysteretic capacity and low material utilization. In this paper, a new partially restrained energy dissipater consisting of an inner core bar and an outer partially restraining tube was developed. The inner core bar is milled along the longitudinal direction of the core bar, avoiding the adverse effects of grouting and welding and improving the utilization of the material. Parametric studies on geometrical variables were performed to investigate the low-cycle fatigue behaviors and deformation patterns of the proposed partially restrained energy dissipaters. Test results showed that the partially restrained energy dissipaters demonstrated stable hysteretic performance, and no local or overall buckling was observed. Design guidelines concerning the prevention of torsion buckling, control of section expansion and avoidance of local failure of the transitional segment were developed. The buckling responses, contact conditions and plastic deformations were analyzed via validated numerical models. (C) 2018 Elsevier Ltd. All rights reserved.
机译:结构中构造的耗能器在集中破坏和保护基础结构方面起着重要的熔断作用。高性能消能器的预期特性是稳定的磁滞行为,易于制造和低成本。先前研究的消能器具有诸如灌浆困难,滞后能力不足和材料利用率低的缺点。本文开发了一种由内芯棒和外部分约束管组成的新型部分约束消能器。沿芯棒的纵向铣削内芯棒,避免了注浆和焊接的不利影响,并提高了材料的利用率。对几何变量进行了参数研究,以研究所提出的部分约束能量耗散器的低周疲劳行为和变形模式。测试结果表明,部分受约束的耗能器显示出稳定的磁滞性能,并且未观察到局部或整体屈曲。制定了有关防止扭转屈曲,控制截面扩展和避免过渡段局部破坏的设计准则。通过验证的数值模型分析了屈曲响应,接触条件和塑性变形。 (C)2018 Elsevier Ltd.保留所有权利。

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