低周反复荷载下核心高强混凝土柱抗震性能试验研究

完成了9根以轴压比、核心高强混凝土面积为参数的核心高强混凝土柱水平低周反复荷载试验,描述了试验柱的破坏过程,测得了荷载-位移滞回曲线,分析了试验柱的耗能性能、抗力衰减、骨架曲线及延性性能.试验结果表明:对于剪跨比为3,轴压比n_o=0.33～0.42的核心高强混凝土柱,在水平低周反复荷载作用下发生压弯破坏,滞回曲线饱满,无明显的捏缩现象,位移延性系数均大于3,延性较好.

Experimental Study of the Seismic Behavior of Concrete Columns with High Strength Core under Low Cyclic Loading

Nine low cyclic loading tests on concrete columns with high strength core were carried out in terms of the axial compression ratio and the area of core high strength concrete. In addition, the failure procedures were described and the loading-displacement hysteretic curves were measured, and the behavior of energy dissipation, strength and stiffness degradation, skeleton curves and ductility of these specimens were analyzed. It was observed from the results that, when the shear-span ratio was 3 and the axial compression ratio n_o=0.33～0.42, a concrete column with high strength core underwent a compression-flexure failure under low cyclic loading, and its hysteretic curve was plump and no significant pinch phenomenon occurred. The ductility was so good that the ductility coefficient was greater than 3.