H型钢混凝土柱复合受扭性能试验研究

Experimental research on combined torsional behavior of H steel reinforced concrete columns

为研究H型钢混凝土柱在低周反复荷载作用下的复合受扭性能,进行了3个比例为1:2的H型钢混凝土柱拟静力试验,得到柱在低周反复扭矩作用下的裂缝形成和发展规律及破坏特征,研究了扭矩-扭率曲线滞回特性、耗能能力,并讨论轴压比、扭弯比对型钢混凝土柱复合受扭性能的影响。结果表明,轴压比的提高对于型钢混凝土柱初始抗扭刚度的加强有利,但对复合受扭后期承载力的衰减不利,延性变差。扭弯比的减小增加了柱身的弯曲变形,增强了柱身的耗能能力,但由于弯曲损伤的增加,抗扭承载力相应减小。箍筋由于绑扎问题产生的滑移对抗扭承载力的丧失影响较大,抗扭角柱箍筋的构造措施应引起工程界的重视。

In order to research the combined torsional behavior of H steel reinforced concrete columns subjected to low frequency cyclic load, quasi-static tests were conducted on 3 half scale SRC （steel reinforced concrete） columns, the formation, development rules and failure characteristic of the crack are obtained. In the paper, the hysteretic characteristics of torsion moment-torsion angle curve and the capacity of dissipating energy were stud- ied, and the effect of the axial compression ratio and the ratio of torque on the bending moment was also dis- cussed. The research shows that the improvement of the axial compression ratio will help strengthen the initial torsional stiffness of the steel reinforced concrete columns, but will not help the decay of later bearing capacity, and its ductility become poor. The decrease of the ratio of torque to bending moment increases the bending de- formation of the columns and also enhances the energy dissipation capacity of the columns, but due to the in- crease of bending torsional strength, neering field. damage, the torsional strength relatively decreases. The slip of stirrups causes a great loss of the structural measures of the torsional column stirrup should be greatly studied in the engineering field.