配置600 MPa级高强钢筋T形柱抗震性能试验研究

600 MPa级钢筋是一种新型高强度钢筋,为研究该钢筋应用于异形柱结构体系的可行性,对7根不同轴压比、体积配箍率和钢筋强度的混凝土T形柱试件进行低周往复荷载试验,分别对其承载力、位移、滞回曲线、骨架曲线、刚度退化和耗能性能进行研究,综合评估其抗震性能。研究结果表明:配置600 MPa级钢筋的混凝土T形柱具有良好的变形能力和承载能力,提高配箍率能有效提高试件的抗震性能,提高轴压比可以提高试件的承载力,但降低其变形能力。随着钢筋强度的提高,试件的承载力显著提高。

Experimental analysis of seismic behavior of 600 MPa RC T-shaped columns

600 MPa steel bar was a new type of high-strength reinforcing bar. Seven T-shaped column specimens varying in stirrup ratios, axial compression ratios and steel strength were tested under low cyclic loading to investigate the feasibility of using this type of reinforcement in specially shaped column. Behaviors in bearing capacity, displacement, hysteretic behavior, skeleton characteristic, rigidity degradation and energy dissipation were investigated to analysis the seismic performance of columns. The results showed that 600 MPa RC T-shaped columns had favorable deformation capacity and bearing capacity. Improving stirrup ratios could effectively improve the seismic performance. With the increase of axial compression ratios, the bearing capacity of columns was bigger, but the deformation capacity deteriorated. With the improvement of the strength of steel, bearing capacity, deformation capacity significantly increased.