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提出配置扩大十字型钢和45°布置十字型钢两种截面形式的新型型钢混凝土柱,通过4个新型与1个普通型钢混凝土柱的低周反复荷载试验,研究新型截面型钢混凝土柱在较高轴压比下的破坏特征、滞回和骨架特性,并分析配钢形式和轴压比对柱抗震性能的影响。试验结果表明:新型截面型钢混凝土柱在压、弯、剪共同作用下均发生了弯曲破坏,在加载后期,即使纵筋外鼓屈服以及型钢翼缘局部屈曲,柱的竖向承载力仍较为稳定;新型截面型钢混凝土柱试件滞回曲线饱满,无捏缩现象,等效黏滞阻尼系数均达到0.45以上,并且截面配钢率相差不大的情况下,其变形和耗能能力明显大于普通型钢混凝土柱;新型截面型钢混凝土柱在高轴力下的承载能力和变形性能良好,其轴压比限值可比规范规定有所提高。
This paper proposes a new type of SRC columns with enlarged cross section and 45 ° cross-section steel. Through the low-cycle cyclic loading test of 4 new type and 1 ordinary type steel reinforced concrete columns, The failure characteristics, the hysteresis and the skeleton characteristics were analyzed. The influence of the form of steel and axial compression ratio on the seismic performance of columns was also analyzed. The test results show that the new type of SRC columns under bending, bending and shearing are both bent and damaged. In the late loading stage, the vertical bearing capacity of the columns is stable even when the longitudinal reinforcement buckles and the local buckling of the steel flanges . The deformation curves and the energy dissipation capacity of the new section steel columns are much larger than that of the normal ones with no hysteresis curve and the equivalent viscous damping coefficients of 0.45 or more, Steel reinforced concrete columns. The load-bearing capacity and deformation performance of the new section steel reinforced concrete columns under high axial force are good, and the axial compression ratio limits can be improved compared with the specifications.