受荷方式对钢管混凝土轴压短柱力学性能影响

采用有限元分析软件DIANA对钢管混凝土轴压短柱进行理论分析，并用试验数据验证了有限元模型、材料参数和分析结果的正确性．在此基础上，分析了三种典型受荷方式和黏结强度对钢管混凝土轴压短柱力学性能的影响．三种受荷方式为：1)荷载作用在整个截面上；2)荷载作用在钢管截面上；3)荷载作用在混凝土截面上．有限元分析结果和试验结果及他人试验结果吻合较好．研究结果表明，受荷方式对钢管混凝土轴压短柱的力学性能影响较大；当荷载作用在整个截面上时，黏结强度对轴压短柱的力学性能没有影响；当荷载仅作用在混凝土截面上时。黏结强度对轴压短柱的力学性能影响较大．

Influence of load conditions on mechanical behavior of CFST stub columns subjected to axial compression

Based on the theoretical model, material parameters and analytical results are confirmed by the experiment data, a finite element program DIANA is employed to analyze the mechanical behaviors of concrete-filled steel tube (CFST) stub columns under three types of loading conditions: 1. Steel tube and concrete subject to compressive load simultaneously; 2. Compressive load acts on concrete only with no bond between steel tube and concrete; 3. Compressive load acts on concrete only with full bond between steel tube and concrete. Results show that if the steel tube and concrete are loaded simultaneously, the bond strength has no influence on the behavior of the stub columns, while if the load is acted only on concrete, the mechanical behavior of the stub columns are greatly influenced by the bonding conditions between steel and concrete.