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完成了8根方钢管高强混凝土柱在低周反复荷载作用下的试验,以轴压比、含钢率和长细比为试验参数,研究该类构件的破坏特征、滞回性能和变形能力,分析各参数对试验结果的影响。结果表明:试件的破坏为柱底部钢管截面被压曲、核心混凝土被压碎的,从而丧失承载力,属于压弯型破坏;试件的滞回曲线饱满,没有明显的捏缩现象;位移延性系数在3.05―4.07之间,满足结构抗震设计要求。表明方钢管高强混凝土柱具有良好的抗震性能。研究成果可为方钢管混凝土结构的工程实践提供参考。
The tests of 8 columns of square steel tube high strength concrete columns under low cyclic loading were completed. The failure characteristics, hysteresis properties and deformation capacities of the members were studied with axial compression ratio, steel ratio and slenderness ratio as the experimental parameters. Analysis of the impact of various parameters on the test results. The results show that the failure of the specimen is buckling of the section of the steel tube at the bottom of the column and crushing of the core concrete, thus losing the bearing capacity, which belongs to the buckling-type failure. The hysteresis curve of the specimen is full without obvious pinch-shrinkage phenomenon. Ductility coefficient between 3.05-4.07, to meet the structural seismic design requirements. It shows that the square steel tube high strength concrete columns have good seismic performance. The research results can provide reference for the engineering practice of square steel tube concrete structure.