高轴压比方钢管高强混凝土柱抗震性能仿真分析

FINITE SIMULATION ANALYSIS ON SEISMIC BEHAVIOR OF HIGH STRENGTH CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMNS UNDER HIGH AXIAL COMPRESSION RATIO

钢管混凝土因其良好的抗震性能被应用在高层建筑中,但有时在建筑的底部会出现高轴压比的情况,因此对高轴压比方钢管高强混凝土柱抗震性能展开来研究。采用有限元软件ABAQUS对7组高轴压比的方钢管高强混凝土柱进行了模拟,其结果表明,轴压比的增加,钢管混凝土柱承载力提高,但抗震性能降低;含钢率的增加,钢管混凝土柱承载力和抗震性能均提高;长细比的增加,钢管混凝土柱承载力和抗震性能均降低。

Concrete-filled steel tubular(CFST) has been applied in high-rise buildings for its good seismic behavior, but sometimes there is a high axial compression ratio at the bottom of buildings. Therefore, seismic behavior of high strength CFST columns under high axialcompression ratio is researched. The finite element software ABAQUS was adopted to analyse7 groups of high strength CFST columns under the high axial compression ratio. The results of this analysis indicate that with the increase of axial pressure ratio, the bearing capacity of CFST column increases, while its seismic behavior decreases;the bearing capacity and seismic behavior of CFST increases with the increase of sectional steel ratio;the bearing capacity and seismic behavior of CFST decreases as its slenderness ratio increases.