The study of reinforced concrete members subjected to combined loads always has been an important research topic in the field of engineering, but the torsional behavior of T-shaped reinforced concrete members subjected to combined loads has yet to be determined. This paper is focused on providing a detailed explanation of the torsional behavior of T-shaped reinforced concrete members subjected to combined compression-bending-shear-torsion. From the perspective of experimental tests and numerical analyses, in this paper, we discuss the effects of combined loads on the torsion bearing capacity, the development of cracks and the failure mode, strains of key points in the concrete and longitudinal reinforcement, and the relation of torsion and angular displacement. We conducted experiments and numerical analyses of four groups of reinforced concrete members by using the main variables of the axial pressure ratio and the bending moment. Also, the experimental and calculated results are compared based on the elastic-plastic damage constitutive model of concrete. Based on the test data and the existing formula, we also extended the formula used to calculate the torsion bearing capacity and provided diagrams of the interaction when combined loads were applied. In addition, the results of this study highlight the turning point from torsion failure to compression-bending-torsion failure. The test results demonstrated that torsion capability increases in the specified range of axial pressure ratio and decreases as bending increases. The test results also indicate the importance of considering the effects of compression-shear-bending on the torsion bearing capacity in the engineering design.

承受组合荷载的钢筋混凝土构件的研究一直是工程领域的重要研究课题，但承受组合荷载的T形钢筋混凝土构件的扭转性能尚待确定。本文的重点是详细解释T形钢筋混凝土构件在组合压缩弯剪扭力作用下的扭转行为。从实验测试和数值分析的角度，本文讨论了组合载荷对抗扭承载力，裂缝发展和破坏模式，混凝土中关键点的应变以及纵向钢筋的影响以及它们之间的关系。扭转和角位移。我们利用轴向压力比和弯矩的主要变量对四组钢筋混凝土构件进行了实验和数值分析。同时，基于混凝土的弹塑性损伤本构模型，对实验结果和计算结果进行了比较。根据测试数据和现有公式，我们还扩展了用于计算抗扭承载力的公式，并提供了施加组合载荷时的相互作用示意图。此外，这项研究的结果突出了从扭转破坏到压缩弯曲扭转破坏的转折点。测试结果表明，在规定的轴向压力比范围内，扭转能力会增加，而随着弯曲度的增加，扭转能力会下降。