不同轴压比大尺寸钢筋混凝土柱抗震性能研究

对4个截面边长为700 mm×700 mm的高轴压比钢筋混凝土柱进行了水平荷载作用下的单调和反复加载试验,讨论了其承载力、破坏形态和滞回特性,分析了轴压比和反复加载对试件的承载力、变形及耗能的影响。结果表明:随着轴压比的增加,试件的骨架曲线的下降段略陡,延性和极限变形较小,而承载力和耗能增加;相对于单调加载,反复加载的试件强度退化较快,极限位移较小。

SEISMIC BEHAVIOR OF LARGE-SCALE REINFORCED CONCRETE COLUMNS WITH DIFFERENT AXIAL LOAD RATIO

Four 700mm × 700mm reinforced concrete columns were tested under monotonic horizontal loading and low cycle reversed loading with high axial load ratio.Their bearing capacity,failure characteristic and hysteretic behavior were discussed.The axial load ratio and low cycle reversed loading and their influence on bearing capacity,deformation and energy dissipation were analyzed.The results indicate that skeleton curve of specimen declines slightly,ductility and ultimate deformation are small,and the bearing capacity and energy dissipation increase as axial load ratio increases.Strength degradation of specimen under low cycle reversed loading is rapid relative to the specimen under monotonic loading,and there is also less ultimate deformation.