Reinforced concrete girders of curved cable-stayed bridges are subjected to the combined loads of compression-bending-shear-torsion, which can result in complex interaction behaviours. This paper presents an experimental study conducted to understand the behaviours of T-shaped reinforced concrete columns subjected to the combined loads of compression-bending-shear-torsion. The main variables considered in this study are axial pressure ratio and torsional change. The results of tests on twelve reinforced concrete columns subjected to the combined loads are obtained, and the effects of combined loads on the bending strength are discussed. This paper presents the formula established for calculating the bending strength and the diagrams of interaction under the combined loads of compression-bending-shear-torsion. Particularly, the results highlight the turning point from the bending failure to the compression failure, and demonstrate that bending capability increases within the specified range of axial pressure ratio and decreases with the increasing torsion. In addition, this study indicates the importance of considering the effects of compression, shear and torsion on bending strength in the engineering design.

弯曲斜拉桥的钢筋混凝土大梁要承受压缩-弯曲-剪切-扭转的综合载荷，这可能导致复杂的相互作用行为。本文提出了一项实验研究，以了解T型钢筋混凝土柱在压缩-弯曲-剪切-扭转共同作用下的性能。在这项研究中考虑的主要变量是轴向压力比和扭转变化。得到了十二根钢筋混凝土柱在组合荷载作用下的试验结果，并讨论了组合荷载对弯曲强度的影响。本文提出了用于计算抗弯强度的公式，以及在压缩-弯曲-剪切-扭转共同作用下的相互作用图。尤其，结果突出显示了从弯曲破坏到压缩破坏的转折点，并表明在指定的轴向压力比范围内，弯曲能力会增加，并随着扭转力的增加而降低。此外，这项研究表明在工程设计中考虑压缩，剪切和扭转对弯曲强度的影响非常重要。