Experimental and numerical study of a novel double-stage capacity-adjustable buckling-restrained brace

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-28 DOI:10.1016/j.istruc.2025.109275

Liang Cai , Shaofeng Wu , Kaiqi Lin , Zuoxuan Sun , Weidong Zhuo

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引用次数: 0

Abstract

To enhance the seismic performance of buckling-restrained braces (BRBs) and meet the requirements for seismic resilience under multi-level earthquakes, this study proposes a novel double-stage capacity-adjustable buckling-restrained brace (CABRB). The CABRB features a sacrificial component and an energy-dissipating BRB working in parallel. During small earthquakes, the sacrificial component provides additional stiffness and strength to ensure structural serviceability. As seismic intensity increases, the sacrificial component fails, helping to concentrate the seismic damage on the BRB component and protecting other structural components. This study first designed and conducted quasi-static tests to evaluate the seismic performance and post-earthquake reparability of the CABRB equipped with various opening-shaped sacrificial plates. Upon the experimental investigations, refined finite element models were established to conduct parametric analyses for evaluating the influences of geometric parameters of the sacrificial plate on the mechanical properties of the CABRB. Additionally, two-story braced frame numerical models, one equipped with BRBs and the other with CABRBs, were established and compared to validate the feasibility and applicability of the CABRBs. The results indicate that the proposed CABRB, with its unique double-stage mechanical behavior, not only meets the multi-level seismic performance requirements, but also exhibits excellent post-earthquake reparability. This provides valuable insights and technical support for the multi-level seismic design of civil structures.

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新型双级可调屈曲约束支撑的实验与数值研究

为了提高屈曲约束支撑（brb）的抗震性能，满足多级地震条件下的抗震回弹要求，提出了一种新型的双级可调屈曲约束支撑（CABRB）。CABRB具有一个牺牲元件和一个并联工作的耗能BRB。在小地震中，牺牲构件提供额外的刚度和强度，以确保结构的可用性。随着地震烈度的增加，牺牲构件失效，有助于将地震损伤集中在BRB构件上，保护其他结构构件。本研究首先设计并进行了准静力试验，对装有不同开口形状牺牲板的CABRB的抗震性能和震后可修复性进行了评价。在试验研究的基础上，建立精细化有限元模型，进行参数化分析，评估牺牲板几何参数对CABRB力学性能的影响。此外，还建立了两层支撑框架的数值模型，分别安装了brb和cabb，并进行了对比，验证了cabb的可行性和适用性。结果表明，该结构具有独特的双阶段力学性能，不仅满足多级抗震性能要求，而且具有良好的震后修复能力。这为土木结构多层次抗震设计提供了有价值的见解和技术支持。

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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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.