中文摘要：

以实验研究和圆CFRP-钢管约束混凝土在轴压力作用下的应力-应变关系为基础,应用纤维模型法模拟了16根圆CFRP-钢管混凝土受弯构件的弯矩-曲率关系。计算值与实验值符合良好,且偏于安全,表明纤维模型法用于分析圆CFRP-钢管混凝土受弯构件是可行的。分析了纵向CFRP层数和长径比对圆CFRP-钢管混凝土受弯构件力学性能的影响。总结了典型的圆CFRP-钢管混凝土受弯构件的弯矩-曲率关系曲线的特点。对于含有纵向CFRP的构件,其曲线可以分为三个阶段：弹性阶段、弹塑性阶段和软化阶段;对于不含有纵向CFRP的构件,其曲线可以分为三个阶段：弹性阶段、弹塑性阶段和塑性增强阶段。该方法也可用于圆钢管混凝土受弯构件的弯矩-曲率关系分析。

英文摘要：

Based on experimental study and stress-strain relationship of the concrete confined by circular CFRP- steel tube under axial load, the fiber model method was used to analyze relationship of moment-curvature about the concrete filled circular CFRP-steel tubular flexural members, and the results predicted check well with that of the test and on the safe side, and this means that the fiber model method is effective in analyzing relationship of moment-curvature about the concrete filled circular CFRP-steel tubular flexural members. Influences of layer of the longitudinal CFRP and slenderness ratio on static performance of the concrete filled circular CFRP-steel tubular flexural members were analyzed. The feature of relationship of moment-curvature about the concrete filled circular CFRP-steel tubular flexural members was summarized ： for members with longitudinal CFRP, its curve could be defined as the following three stages： elastic stage, elasto-plastic stage and softening stage, and for members without longitudinal CFRP, its curve could be defined as the following three stages： elastic stage, elasto-plastic stage and plastic strengthening stage. The method presented here is suitable for analyzing relationship of moment-curvature about the concrete filled circular steel tubular （circular CFST） flexural members too.