圆形截面钢管钢筋混凝土构件承载力的计算

对8个圆形截面钢管钢筋混凝土构件进行了轴心受压和偏心受压试验,采用有限元法和纤维模型法对构件承载力进行了计算,提出了圆形截面钢管钢筋混凝土构件承载力的简化计算方法。研究表明,圆形截面钢管钢筋混凝土具有与钢管混凝土和钢筋混凝土相同的特点,按有限元法计算的构件承载力偏小,而按纤维模型法计算的构件承载力与试验结果符合较好。圆形截面钢管钢筋混凝土构件的承载力可通过将钢管视为普通钢筋,将混凝土视为钢管约束混凝土的双层钢筋约束混凝土构件,采用圆形截面钢筋混凝土构件承载力的计算方法进行简化计算。按简化方法计算的圆形截面钢管钢筋混凝土构件的承载力也与试验结果符合较好。

Calculation method for load-carrying capacity of circular reinforced concrete members covered with steel tube

Axial and eccentric compression experiments are carried out on 8 circular reinforced concrete specimens covered with steel tube， and the finite element method and the fiber model method are used to calculate the load-carrying capacity of the specimens. Based on the experimental and theoretical analysis，a simplified calculation method of the load-carrying capacity for this kind of member is proposed in the study. The analysis indicate that the finite element method result is relatively small， and that the results of the load-carrying capacity of the specimens calculated by the fiber model method agree well with the experimental results. The circular reinforced concrete members covered with steel tube present the characteristics of both the reinforced concrete and concrete filled steel tube members，showing higher load-carrying capacity and greater deformability. The load-carrying capacity of circular reinforced concrete members covered with steel tube can be calculated by the method of the reinforced concrete member with the confined concrete. The load-carrying capacity of the circular reinforced concrete members covered with steel tube calculated by the simplified method is in good agreement with the experimental results.