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Tensile behavior of bolted-angle connections at high temperatures under progressive collapse scenarios
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.jobe.2025.111836
Zequn Li, Yan Fei Zhu, Yufei Liu, Huiyun Zhang, Yao Yao

Prefabricated steel structures with bolted-angle connections are effective in resisting progressive collapse due to their high load-bearing and rotational capacities. This study investigates the tensile properties of these connections under ambient and high-temperature (500 °C and 800 °C) steady-state tests. A total of 30 tensile tests with various parameters, such as angle thickness, gauge length, and connection type, were conducted to assess their behavior in both ambient and fire conditions. Four failure modes were identified: bolt bending fracture with yielded angles, bolt shear fracture with yielded angles, angle fracture close to heel with yielded bolts, and threads failure with yielded angles. The findings show that at ambient temperature, both angle and bolt failures occur, while high temperatures primarily lead to bolt failure. The study also emphasizes the significant impact of the tensile membrane action on load-bearing during large deformations. A sequential thermal-mechanical coupling analysis using ABAQUS/Explicit accurately modeled the observed mechanical behaviors and failure modes, highlighting the importance of considering thermal properties in the design of these connections. This study examines the high temperature tensile behavior of bolt-angle connections to provide design recommendations and supporting references for their performance under fire conditions.

中文翻译:


渐进式塌陷情况下螺栓角连接在高温下的拉伸行为



具有螺栓连接角连接的预制钢结构由于其高承载和旋转能力,可有效抵抗逐渐倒塌。本研究调查了这些连接在环境和高温(500 °C 和 800 °C)稳态测试下的拉伸性能。总共进行了 30 次具有不同参数(如角度厚度、标距长度和连接类型)的拉伸测试,以评估它们在环境和火灾条件下的行为。确定了四种失效模式:螺栓弯曲断裂伴屈服角、螺栓剪切断裂伴屈服角、靠近脚跟角的角断裂伴屈服螺栓和螺纹失效伴屈服角。研究结果表明,在环境温度下,角钢和螺栓失效都会发生,而高温主要导致螺栓失效。该研究还强调了拉伸膜作用对大变形期间承载的重大影响。使用 ABAQUS/Explicit 的顺序热-机械耦合分析准确地模拟了观察到的机械行为和失效模式,突出了在设计这些连接时考虑热特性的重要性。本研究考察了螺栓角连接的高温拉伸行为,为其在火灾条件下的性能提供设计建议和支持参考。
更新日期:2025-01-21
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