Research on the interfacial bonding performance of novel composite L‐shaped concrete‐filled steel tubes

Ying‐hua Bai, Hao Xin, Bo Xie, Kang Shen, Yan Yan
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Abstract

SummaryThis study aims to investigate the bonding performance of novel composite specially shaped concrete‐filled steel tubes (CFSTs). Seven novel composite L‐shaped CFST specimens were designed utilizing variations in steel tube wall thickness, steel tube length, and concrete strength as the primary parameters. Their failure modes, load–slip relationships, and longitudinal strain distribution patterns were examined through push‐out tests. Additionally, finite element models of the members were established using nonlinear spring elements based on the experimental data and subjected to numerical analysis. The research findings indicate that the ultimate bond strength of the composite L‐shaped CFSTs is positively correlated with steel tube wall thickness, steel tube length, and concrete strength. The strain distributions on the concave and convex faces of the L‐shaped steel tubes are identical. The results obtained from the finite element analysis closely match the experimental findings.
新型复合 L 型混凝土填充钢管的界面粘接性能研究
摘要 本研究旨在探讨新型复合特殊形状混凝土填充钢管(CFST)的粘结性能。以钢管壁厚、钢管长度和混凝土强度为主要参数,设计了七种新型复合 L 形 CFST 试件。通过挤压试验研究了它们的破坏模式、载荷-滑移关系和纵向应变分布模式。此外,还根据实验数据使用非线性弹簧元素建立了构件的有限元模型,并进行了数值分析。研究结果表明,复合 L 型 CFST 的极限粘结强度与钢管壁厚、钢管长度和混凝土强度呈正相关。L 形钢管凹面和凸面上的应变分布相同。有限元分析得出的结果与实验结果非常吻合。
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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