钢管混凝土框架骨架曲线研究

Research on skeleton curves of concrete-filled steel tubular frame structure

以钢管混凝土统一理论为基础，从截面层次的恢复力模型出发，钢管混凝土柱构件选用三线型弯矩～曲率滞回模型；钢梁采用双线型弯矩-转角滞回模型；钢筋混凝土梁选用三线型弯矩-转角滞回模型。使用非线性分析程序IDARC分析钢粱-钢管混凝土柱和钢筋混凝土梁-钢管混凝土柱两类框架结构的骨架曲线，程序结果和试验结果吻合良好。并进一步研究了轴压比、含钢率、混凝土强度和钢材强度等对结构骨架曲线的影响。研究结果不仅为钢管混凝土框架结构的应用推广提供了必要的理论基础，而且对钢管混凝土抗震设计具有较好的参考价值。

According to unified theory and hysteretic model based on section, the hysteretic models of steel beam, reinforced concrete beam and concrete filled steel tubular（CFST） structure column were chosen respectively, then the nonlinear structural analysis program called IDARC is employed to determine the skeleton curve of the concrete filled steel tubular frame structure. Results obtained from program are consistent well with those obtained from experiments. Furthermore, some parameters that affect the restoring force model of concrete filled steel tubular structure were studied, including axial compression ratio~ steel ratio and material strength. The results not only provide a theory basis for popularizing the concrete-filled steel tubular structure, but also play an important role for seismic design of concrete-filled steel tubular structure.