Post-fire performance of welded beam-to-column joint under monotonic and cyclic loading

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-04-15 DOI:10.1016/j.istruc.2025.108926

Fan-Qin Meng , Mei-Chun Zhu

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引用次数: 0

Abstract

The study on the post-fire performance of welded beam-to-column steel joints is crucial for assessing the residual capacity of steel structures and providing structural reinstatement following a fire accident. Therefore, this study experimentally examined the post-fire behaviour of welded beam-column joints subjected to monotonic and cyclic loading conditions. In this research, ten welded beam-to-column joints were subjected to monotonic and cyclic loading protocols until failure after being exposed to temperatures at 20 ℃, 500 ℃, 600 ℃, 700 ℃, and 800 ℃. For specimens subjected to monotonic loading, the experimental results showed that the failure mode of the connection specimens shifted from beam flange buckling to butt weld cracking as the exposure temperature increased to 500°C and above, and the bending moment capacity of the joint generated the maximum 20 % decline. For specimens subjected to cyclic loading, although the strength of the welded beam-to-column joint declined 20 % after high-temperature exposure, the specimen still showed a plumper hysteretic loop, indicating a good energy dissipation performance. The most notable changes were observed at the exposure temperature of 700°C, where the ductility coefficient increased by 14 % and the energy dissipation coefficient rose by 19 %.

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单调荷载和循环荷载下梁到柱焊接接头的火灾后性能

研究钢结构梁柱焊接节点的火灾后性能，对于评估钢结构火灾后的剩余承载力和提供结构修复方案具有重要意义。因此，本研究通过实验研究了焊接梁柱节点在单调和循环加载条件下的火灾后行为。在这项研究中，10个焊接梁柱节点在暴露于20℃、500℃、600℃、700℃和800℃的温度下，经历单调和循环加载直到破坏。试验结果表明，在单调加载下，随着暴露温度升高至500℃及以上，连接试件的破坏模式由梁翼缘屈曲转变为对接焊缝开裂，节点弯矩承载力最大下降20% %；在循环荷载作用下，虽然高温暴露后梁柱焊接节点的强度下降了20% %，但试件的滞回线仍较为饱满，耗能性能良好。暴露温度为700℃时变化最为显著，延性系数提高了14 %，耗能系数提高了19 %。

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.