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首页> 外文期刊>Bulletin of earthquake engineering >A novel all-steel buckling restrained brace for seismic drift mitigation of steel frames
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A novel all-steel buckling restrained brace for seismic drift mitigation of steel frames

机译：一种新型全钢屈曲束缚钢框架地震漂移缓解支架

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摘要

Buckling restrained braces (BRBs) as metallic dampers can supply stable and balanced hysteretic response. While BRBs exhibit outstanding energy dissipation capacity, their low post-yield stiffness contributes to large residual drift concentration in simply supported buckling restrained braced frames. The present study introduces a novel all-steel tube-in-tube BRB composed of a short-length hybrid core serially connected to a non-yielding robust member. The hybrid core includes short-length yielding members made up of circular hollow sections surrounded by an all-steel encasing system. High strain hardening capacity of short-length hybrid core enhances the post-yield stiffness, thus reducing the residual drift in simply supported buckling restrained braced frame. In this paper, first the components of proposed brace are represented in detail. Subsequently, the design procedure and stability analysis results are provided. The feasibility of conceptual hybrid BRB is evaluated by finite element analysis method. Afterwards, the global response of prototype buckling restrained braced frames comprising conventional and proposed braces are appraised via pushover and nonlinear time history analyses. The analyses results designated the significant efficiency of proposed braces to help mitigate inter-story and particularly residual drifts in buckling restrained braced frames.
机译：作为金属阻尼器的屈曲约束支撑（BRB）可以提供稳定且平衡的滞回响应。尽管BRB具有出色的耗能能力，但其较低的屈服后刚度导致简支屈曲约束支撑框架中存在较大的残余位移集中。本研究介绍了一种新型的全钢管BRB，由一个短长度的混合型芯串联连接到一个不屈服的坚固构件上。混合核心包括由圆形空心截面组成的短长度屈服构件，由全钢包围系统包围。短长度混合芯的高应变硬化能力提高了屈服后刚度，从而减少了简支屈曲约束支撑框架的残余位移。在本文中，首先详细介绍了拟用支撑的组成部分。随后给出了设计步骤和稳定性分析结果。采用有限元分析方法对概念混合式BRB的可行性进行了评估。然后，通过pushover和非线性时程分析，对原型屈曲约束支撑框架（包括传统支撑和建议支撑）的整体响应进行了评估。分析结果表明，建议的支撑具有显著的效率，有助于减轻层间位移，尤其是屈曲约束支撑框架中的残余位移。

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