异形柱组合框架结构力学性能有限元对比分析

对钢筋混凝土异形柱承载力低、轴压比限值低、节点薄弱和抗震性能不理想等特点,将异形柱分别与型钢混凝土结构和钢管混凝土结构相结合,基于OpenSees建立三层两跨平面实腹式异形柱中框架模型,进行静力推覆分析和滞回性能分析,通过改变轴压比参数,获得结构滞回曲线和骨架曲线,进一步分析其承载力、延性和耗能等相关力学特性。研究结果表明:同钢筋混凝土异形柱框架相比,型钢混凝土异形柱框架和钢管混凝土异形柱框架的承载力和延性均有提高;随着轴压比增大,两种异形柱框架的弹性刚度基本不变,但荷载一顶点位移曲线下降段越陡而导致延性降低;同样配筋率下,钢管混凝土异形柱框架的承载力和延性均高于型钢混凝土异形柱框架,并且可以提高施工速度;相关研究成果可为科研和工程设计提供研究参考。

Comparative Finite Element Analysis of Mechanical Properties of CompositeSpecial-shaped Column Frame Structure

In order to overcome the shortcoming of low bearing capacity, low axial compression ratio, weak node and poor seismic performanceof traditional reinforced concrete special-shaped column frame structure, the steel reinforced concrete structure and concrete filled steel tube structure were combined with special-shaped column structure. A two span three story planner full web type middle frame model was constructed on the basis of OpenSees software, and pushover analysis and hysteretic behavior analysis were carried out. By changing the axial compression ratio, the skeleton curves and hysteretic curve were obtained, and the related mechanical properties of bearing capacity, ductility and energy dissipation further analysis. Compared with reinforced concrete special-shaped column frame structure, the bearing capacity and ductility of steel reinforced concrete frame and concrete filled steel tube frame improved greatly. With the increase of axial compression ratio, the elastic stiffness of two types of special-shaped column frame was essentially constant, but the descending stage of force-displacement curve is steep and leads to a decreased ductility. In the same reinforcement ratio, the bearing capacity and the ductility of concrete filled steel tubular frame were higher than that of steel reinforced concrete special-shaped column frame, which can increase the speed of construction, but its fire resistance performance is poor. The research can provide reference for the scientific research and engineering design.