双向偏压剪反复扭构件抗震性能试验研究

Experimental Study on Aseismic Behaviors of RC Members Subjected to Biaxial Eccentric Compression, Shear and Reversed Torque

通过对 8根承受双向偏压力、剪力作用的钢筋混凝土柱在低周反复扭矩作用下的抗震性能试验 ,对钢筋混凝土复合受扭构件的破坏形态、滞回曲线、延性及耗能、承载力、刚度及滞回阻尼等特性以及轴压比、相对偏心距对它们的影响进行了分析 .并通过空间变角桁架理论推导出扭矩、轴压力、双向弯矩和双向剪力间的承载力相关公式 ,最后通过相关公式和试验结果拟合出极限扭矩实用计算公式 .

By means of an experiment of eight reinforced concrete (RC) columns subjected to biaxial eccentric compression,shear and low-cyclic torsion,the failure modes,hysteresis loop,ductility,energy dissipation,strength,rigidity and hysteresis damping properties as well as influences of compression level and relative eccentricity on the properties are analyzed.Based on the variable-angle space truss model theory,an axial compression-biaxial bending-biaxial shear-torsion interaction equation is developed and finally a practical formula of ultimate torsion strength is derived.The predictions of the formula agree well with the experiment results.