【摘要】 在确定高温后钢材和混凝土应力-应变关系的基础上,建立了恒高温后钢管高性能混凝土轴压构件的理论分析模型,对恒高温后该类构件的荷载-变形关系由线进行了计算,并与以往试验结果进行了比较,二者符合较好。分析结果表明,恒高温后钢管高性能混凝土轴压构件的荷载-变形关系弹性段变短,弹塑性段变长,极限承载力降低,极限承载力对应的应变增大,曲线下降段趋于不明显,这一特性与钢管普通混凝土构件高温后性能较为相似。更多还原

【Abstract】 Based on the stress-strain relations for steel and concrete after high temperature, fiber-based model was developed to calculate the load versus axial deformation relationships for high-performance concrete filled circular hollow section (CHS) stub columm after exposure to high temperature. The numerical results show good agreement with the test results reported in the literature. It had been found that the load versus axial deformation relationships of high-performance concrete filled CHS stub columns subjected to high temperatures, showed strain hardening or an ehstic-peffecdy plastic behavior. The ultimate strength of a column was reduced and less than the corresponding value under ambient conditions and the strain at peak load was larger than the strain at room temperature. This behavior was similar to that of normal concrete-filled steel tube (CFST) generally.更多还原