中文摘要：

基于变角空间桁架理论对钢筋混凝土环形截面构件在拉压弯剪扭组合受力下的极限承载力计算模型进行了研究,具体研究内容包括构件破坏截面几何形式表达和极限承载力计算公式.首先依据变角空间桁架理论推导出在拉压弯剪扭组合受力下的钢筋混凝土环形截面构件的破坏面倾角表达式.据此确定破坏面几何形状,并对破坏面一侧隔离体建立极限平衡方程,获得组合受力的钢筋混凝土环形截面构件承载力计算模型表达式.并将推导的钢筋混凝土环形截面构件承载力计算模型表达式与相应的试验研究结果进行比较.

英文摘要：

Base on variable-angle space truss model theory, the ultimate bearing capacity of reinforced concrete members with ring sections subjected to compound forces was studied in this paper, which includes the form of the failure cross section and a practical formula for calculating the ultimate capacity. Firstly, the inclination angle of failure surface was de- rived base on variable-angle space truss model theory, by which the failure surface was determined. Secondly, equilibrium equations were set-up by the balance of the isolated body besides the failure surface, by which unified expressions to uhi- mate bearing capacity were built. Finally, theoretical expressions were compared with experiment results.