Abstract T-shaped concrete-filled steel tubular (CFST) columns have the advantage of avoiding protrusion from walls and can be used as edge columns. The practical structures may be subjected to the earthquake action from different directions, but little attention has been paid to the behavior of T-shaped CFST columns under diagonal cyclic loading. A total of 14 T-shaped CFST columns were tested under constant axial load and lateral cyclic loading. The main variables explored in the test were loading angle, axial load level, concrete compressive strength and section form. The failure mode, lateral load-lateral displacement hysteretic curves, envelope curves, stiffness degradation, ductility, cumulative energy dissipation, deformation and bending moment-curvature curves were investigated. The results show that the hysteretic curves are generally plump and the displacement ductility coefficients are over 3 for the specimens with the axial load levels of less than 0.5. The specimens at 45° and 90° have close envelope curves, while the specimens at 0° exhibit slightly lower lateral ultimate strength and better ductility. The existing codes such as Eurocode 4, AISC 360–10 and DBJ/T 13-51-2010 give obviously higher predictions of initial section flexural stiffness for stiffened specimens without an axial load and conservative predictions for most multi-cell specimens. Furthermore, the existing codes overestimate the serviceability-level section flexural stiffness for most specimens.

中文翻译：

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T形钢管混凝土柱在斜循环荷载作用下的试验行为

摘要 T形钢管混凝土(CFST)柱具有避免墙体突出的优点，可作为边柱使用。实际结构可能会受到来自不同方向的地震作用，但很少关注T形CFST柱在斜向循环荷载下的行为。共有 14 根 T 形 CFST 柱在恒定轴向载荷和横向循环载荷下进行了测试。试验中探索的主要变量是加载角、轴向载荷水平、混凝土抗压强度和截面形式。研究了破坏模式、横向载荷-横向位移滞后曲线、包络线、刚度退化、延性、累积能量耗散、变形和弯矩-曲率曲线。结果表明，轴向载荷水平小于0.5的试件，滞回曲线总体较为丰满，位移延性系数大于3。45°和90°的试样具有封闭的包络线，而0°的试样横向极限强度略低，延展性更好。欧洲规范 4、AISC 360-10 和 DBJ/T 13-51-2010 等现有规范对没有轴向载荷的加筋试样的初始截面弯曲刚度给出了明显更高的预测，而对大多数多单元试样给出了保守的预测。此外，现有规范高估了大多数试件的适用性级别截面弯曲刚度。45°和90°的试样具有封闭的包络线，而0°的试样横向极限强度略低，延展性更好。欧洲规范 4、AISC 360-10 和 DBJ/T 13-51-2010 等现有规范对没有轴向载荷的加筋试样的初始截面弯曲刚度给出了明显更高的预测，而对大多数多单元试样给出了保守的预测。此外，现有规范高估了大多数试件的适用性级别截面弯曲刚度。45°和90°的试样具有封闭的包络线，而0°的试样横向极限强度略低，延展性更好。Eurocode 4、AISC 360-10 和 DBJ/T 13-51-2010 等现有规范对没有轴向载荷的加筋试样的初始截面弯曲刚度给出了明显更高的预测，而对大多数多单元试样给出了保守的预测。此外，现有规范高估了大多数试件的适用性级别截面弯曲刚度。AISC 360-10 和 DBJ/T 13-51-2010 对没有轴向载荷的加筋试样的初始截面弯曲刚度给出了明显更高的预测，并且对大多数多单元试样给出了保守的预测。此外，现有规范高估了大多数试件的适用性级别截面弯曲刚度。AISC 360-10 和 DBJ/T 13-51-2010 对没有轴向载荷的加筋试样的初始截面弯曲刚度给出了明显更高的预测，并且对大多数多单元试样给出了保守的预测。此外，现有规范高估了大多数试件的适用性级别截面弯曲刚度。