T形截面方钢管混凝土组合异形柱压弯性能研究

Study on mechanical properties of T-shaped column composed of concrete-filled square steel tubes under eccentric compression

通过压弯试验,对T形截面方钢管混凝土组合异形柱的压弯性能进行研究。试验结果表明,试件最终破坏形式为整体弯曲型失稳破坏。结合压弯试验进行非线性有限元模拟,有限元模型的破坏形式、荷载-位移曲线和极限承载力等均与试验结果吻合较好,验证了有限元分析的可行性。利用有限元方法分析柱高度、钢材强度和混凝土强度对异形柱压弯承载力的影响,分析表明,钢材强度对异形柱压弯承载力影响较大。

Mechanical properties of T-shaped column composed of concrete-filled square steel tubes under eccentric compression were investigated by eccentric compression experiment. Experimental results show that the failure mode of the eccentric compression column is flexural bucking of the whole specimen. Nonlinear finite element analysis was also adopted. The predicted results of the failure mode,the load-displacement curve and the ultimate load-bearing capacity are in good agreement with the experimental result. Feasibility of finite element analysis was proved. Influences of height,steel strength and concrete strength on the bending bearing capacity of special-shaped column were got by finite element analysis.Analysis shows that the steel strength has great influence on the bending bearing capacity of special-shaped column.