高强钢筋混凝土复合受扭构件开裂性能试验研究

Experimental study of cracking performance of high-strength reinforced concrete members subjected to combined torsion

以轴压比和相对偏心距为参数,对8根高强钢筋混凝土压弯剪构件在单调扭矩作用下的性能进行了试验研究,探讨了试件裂缝的产生和发展、破坏特征以及影响裂缝倾角和开裂扭矩的因素。推导出了压弯剪复合受扭构件开裂扭矩的计算公式,与试验结果进行对比,计算值与试验值吻合较好,为高强混凝土复合受扭构件开裂扭矩的计算和设计提供了参考。

Cracking performance of high-strength reinforced concrete members subjected to axial compression, shear and torque is studied. Based on the experiment of 8 combined torsion specimens, the cracking, the failure modes of the member are analyzed. It is shown that the axial stress level and relative eccentricity have greatly effect on the angle of cracks and cracking torque of members. A practical formula of cracking torque is concluded for the member subjected to axial compression, shear and torque. It can be proved that the formula agrees well with the results of experiment and can provide valuable reference for design of combined torsion members.