型钢混凝土复合受扭构件抗震性能试验研究

Experimental research on seismic behavior of steel encased concrete members subjected to combined torsion

通过对3个十字型钢混凝土柱的低周反复加载试验,研究型钢混凝土柱在复合扭矩作用下的抗震性能;观察试件的受力过程和破坏特征,分析试件的扭矩-扭率滞回曲线、骨架曲线、延性系数和耗能能力等力学特性,并探讨轴压比、扭弯比等参数对型钢混凝土复合受扭构件抗震性能的影响。试验表明,型钢混凝土柱的骨架曲线下降段较为平缓,其他各项抗震性能指标均较优异,总体上表现出良好的抗震性能;随着轴压比和扭弯比的增大,试件的受扭承载力提高,但延性和耗能能力下降,对抗震不利。

Low-cycle reversed loading experiments were carried on three cross-shaped steel reinforced concrete（SRC） columns to study the seismic behavior of SRC columns subjected to the combined torsion; the loading process and failure characteristics were observed to analyze the mechanical properties such as the torsion-torsional curvature hysteretic curve, skeleton curve, ductility coefficient and energy dissipation capacity and to study the influence of the axial compression ratio and torsion-bending ratio on the seismic behavior of SRC members subjected to compression bending shear and torsion. The results show that the descent part of skeleton curve is relatively smooth and the other seismic behavior indexes are excellent, generally SRC columns have better seismic performance. The increase of axial compression ratio and torsion-bending ratio will enhance the torsional capacity, but decrease the ductility and energy dissipation capacity, which does not help the earthquake resistance.