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.

中文翻译：

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新型复合L型钢管混凝土界面粘结性能研究

摘要本研究旨在研究新型复合材料异形钢管混凝土（CFST）的粘结性能。利用钢管壁厚、钢管长度和混凝土强度的变化作为主要参数，设计了七个新型复合材料 L 形钢管混凝土试件。通过推出测试来检查它们的失效模式、载荷-滑移关系和纵向应变分布模式。此外，根据实验数据，利用非线性弹簧单元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型钢管混凝土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型钢管凹凸面上的应变分布相同。有限元分析得到的结果与实验结果非常吻合。