Seismic performance assessment of existing low-ductility reinforced concrete double-column bridge piers retrofitted with buckling-restrained braces

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering Pub Date : 2024-10-20 DOI:10.1016/j.soildyn.2024.109051

Jing Wang, Chongjie Jin, Yangyang Bao, Yangfan Hong, Wen Xie

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引用次数: 0

Abstract

In this study, buckling-restrained braces (BRBs) are utilized to improve the seismic performance of existing reinforced concrete (RC) double-column bridge piers. Two 1/2-scale models of RC double-column bridge piers—one retrofitted with a BRB (RC-Pier-BRB) and the other without a BRB (RC-Pier)—were designed and compared. The failure mode, stiffness, strength, energy dissipation, and curvature of RC-Pier-BRB and RC-Pier were compared through pseudo-static tests. Fiber finite element models were created using OpenSees to replicate the experimental results. The findings showed that BRBs effectively controlled seismic damage; compared to RC-Pier, RC-Pier-BRB demonstrated a 44.8 % reduction in the maximum curvature. The strength of RC-Pier-BRB increased by 59.2 %, and its energy-dissipation capacity grew by 18–40 % after BRB retrofitting. The numerical model accurately reproduced the trends in the strength, strength degradation, seismic behavior after BRB fracture, and curvature in the plastic zone of the test models. The differences in the peak strengths of RC-Pier and RC-Pier-BRB between the numerical and experimental results were 3.90 % and 0.43 %, respectively. The errors in the maximum curvatures for RC-Pier and RC-Pier-BRB between the numerical and experimental results were 2.03 % and 8.53 %, respectively. Therefore, retrofitting the existing RC double-column bridge piers with BRBs can improve seismic performance and damage control. Furthermore, the connection bases and plates of the BRB remained useable after the BRB buckled and fractured, suggesting a reliable technology for the replacement and recovery of the BRB after an earthquake.

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现有低导性钢筋混凝土双柱桥墩加装屈曲约束支撑的抗震性能评估

本研究利用屈曲约束支撑（BRB）来改善现有钢筋混凝土（RC）双柱桥墩的抗震性能。我们设计并比较了两个 1/2 比例的钢筋混凝土双柱桥墩模型，一个加装了屈曲约束支撑（RC-Pier-BRB），另一个没有加装屈曲约束支撑（RC-Pier）。通过伪静力试验比较了 RC-Pier-BRB 和 RC-Pier 的破坏模式、刚度、强度、能量耗散和曲率。使用 OpenSees 创建了纤维有限元模型，以复制实验结果。研究结果表明，BRB 能有效控制地震破坏；与 RC-Pier 相比，RC-Pier-BRB 的最大曲率降低了 44.8%。加装 BRB 后，RC-Pier-BRB 的强度提高了 59.2%，能量耗散能力提高了 18-40%。数值模型准确地再现了试验模型的强度、强度退化、BRB 断裂后的地震行为以及塑性区曲率的变化趋势。数值结果与试验结果中 RC-Pier和RC-Pier-BRB的峰值强度分别相差3.90%和0.43%。RC-Pier 和 RC-Pier-BRB 的最大曲率在数值结果和实验结果之间的误差分别为 2.03 % 和 8.53 %。因此，在现有的 RC 双柱桥墩上加装 BRB 可以改善抗震性能和损害控制。此外，在 BRB 发生屈曲和断裂后，BRB 的连接基座和板仍可使用，这表明地震后 BRB 的更换和恢复技术是可靠的。

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来源期刊

Soil Dynamics and Earthquake Engineering 工程技术-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

446

审稿时长

8 months

期刊介绍： The journal aims to encourage and enhance the role of mechanics and other disciplines as they relate to earthquake engineering by providing opportunities for the publication of the work of applied mathematicians, engineers and other applied scientists involved in solving problems closely related to the field of earthquake engineering and geotechnical earthquake engineering. Emphasis is placed on new concepts and techniques, but case histories will also be published if they enhance the presentation and understanding of new technical concepts.