低周反复荷载作用下钢筋混凝土柱抗震性能尺寸效应试验研究

通过对不同轴压比下截面边长分别为300、500、700mm的钢筋混凝土柱试件进行低周反复加载试验，研究各试件的破坏模式、滞回特性、骨架曲线、延性和耗能能力，分析截面尺寸对受弯承载力、延性、耗能和塑性铰长度的影响。结果表明：钢筋混凝土柱试件的受弯承载力、延性和塑性铰转动能力随截面尺寸的增大而减小，尺寸效应明显，平均耗能系数也随截面尺寸的增大而减小，表现出明显的尺寸效应。在试验基础上，提出考虑反复加载截面尺寸影响系数的钢筋混凝土柱受弯承载力计算式。

Experimental study on size effect of seismic behavior for reinforced concrete columns under low cycle reversed loading

In order to investigate the size effect on seismic behavior of reinforced concrete columns, six reinforced concrete columns under low cycle reversed loading with three different dimensions, including 300, 500 and 700 mm, and different axial load ratios, were tested. The damage mode, hysteretic behavior, skeleton curves, ductility and energy dissipation were discussed. The influences of section size on bearing capacity, ductility, energy dissipation and plastic hinge rotation ability were analyzed. The results indicate that the flexural capacity, ductility and plastic hinge rotation capacity of reinforced concrete column decrease as section size increases, due to obvious size effect. Size effect of average energy consumption coefficient is also apparent, which decreases as section size increases. Then on the basis of experiment, a practical calculation model of flexural strength of reinforced concrete column considering section size effect coefficient of specimen subjected to cyclic loading was proposed.