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为研究高轴压比方钢管高强混凝土柱的抗震性能,完成了8根轴压比从0.5―0.7的方钢管高强混凝土柱的往复水平加载试验。通过改变试件的轴压比、含钢率和长细比,研究其在往复水平荷载作用下的滞回性能、变形能力以及耗能能力,比较各参数对试验结果的影响。试验结果表明:试件破坏形态为柱底部截面钢管被压曲、核心混凝土被压碎的压弯型破坏;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,等效粘滞阻尼比在0.25―0.31之间,延性系数和耗能指标均满足结构抗震设计要求。表明高轴压比方钢管高强混凝土柱具有良好的抗震性能。基于ABAQUS分析平台,建立了有限元模型,对试验进行了往复水平荷载作用下的全过程模拟分析。分析结果表明:有限元模型分析得到的滞回曲线与试验滞回曲线总体上吻合较好。
In order to study the seismic behavior of high-strength concrete filled steel tubular columns with high axial compression ratio, eight reciprocating horizontal loading tests of square steel tube columns with axial compression ratio from 0.5-0.7 were completed. By changing the axial compression ratio, steel ratio and slenderness ratio, the hysteretic capacity, deformation capacity and energy dissipation capacity under reciprocating horizontal load are studied. The influence of each parameter on the test results is compared. The test results show that the failure mode of the specimen is buckling of the steel pipe at the bottom of the column and collapse of the core concrete by crushing; the hysteresis curve of the specimen is full without obvious pinch-shrink phenomenon; the displacement ductility coefficient is in the range of 3.05-4.07 , The equivalent viscous damping ratio is between 0.25-0.31, and the ductility coefficient and energy consumption index all meet the seismic design requirements. It shows that the high axial compression ratio steel tube high strength concrete column has good seismic performance. Based on the ABAQUS analysis platform, a finite element model was established, and the whole process simulation under the action of reciprocating horizontal loading was simulated. The analysis results show that the hysteresis curve obtained by the finite element model analysis is in good agreement with the experimental hysteresis curve.