中文摘要：

为了预测双层箍筋约束混凝土圆形柱竖向承载力．为轴压试验每级加栽力提供理论依据，文中以单层螺旋箍筋约束混凝土圆形柱为理论基础．双层箍筋约束的核心混凝土的竖向承载力由内外层箍筋共同约束加强，内层箍筋约束加强在外层箍筋约束加强的基础上再有一个约束加强为核心理论．从理论上推导了双层螺旋箍筋约束混凝土圆形柱的竖向承载力：利用ABAQUS有限元软件建立合理的有限元模型，通过应变控制加载，模拟双层箍筋圆形柱，模拟结果与理论推导结果对比吻合较好．证明该公式可预测双层箍筋约束混凝土圆形柱的竖向极限承载力．

英文摘要：

In order to predict vertical bearing capacity of double stirrup constraint concrete circular column and to provide theoretical basis for axial compression test loading force per level, this paper adopts the single spiral stirrups constraint concrete circular column as the theoretical basis. The core theories in this paper are that the vertical ultimate bearing capacity of the core concrete by double stirrup is confined and strengthened by internal and external layer stirrup, and the inner stirrup constraint strengthen has a constraint for strengthening than outer stirrup constraint on the basis of strengthening. Thus, this study has theoretically inferred vertical bearing capacity of the double spiral stirrups constraint concrete circular column. By using the finite element software ABAQUS to establish reasonable finite element model, and through the strain control loading, the simulation results and theoretical derivation results are in good agreement. It has proved that the formula can be used to forecast the vertical ultimate bearing capacity of double stirrup constraint concrete circular column.