【摘要】 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。更多还原

【Abstract】 To test the aseismic behavior of rectangular steel tubular(HCRST) columns filled with high strength concrete,an experiment of eight specimens was carried out under cyclic lateral load and high axial load ratios varying from 0.5 to 0.7.The hysteretic behavior,deformability,and energy dissipation capacity were measured by the changes of the axial load ratio,steel ratio and the slenderness ratio of the specimens.The influences of the specimen parameter were compared.The experimental results show that there are two failure models of the column including the bucking of the steel tube and the crash of core concrete at the base of the specimens.The HCRST columns have the plump hysteretic curves.There is no significant pinch phenomenon.The ductility coefficient varying from 3.05 to 4.07 and the equivalent viscous damping ratio varying from 0.25 and 0.31 can meet the requirements of aseismic design.The experimental results indicate that HCRST columns with high axial load ratio have excellent earthquake resistace.In addition,a finite element model was established and applied to the analysis by the software of ABAQUS.The numerical simulation results are in agreement well with those of the experiments.更多还原