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在平面应变条件下对FRP-混凝土-钢混合双管柱进行力学分析,考虑混凝土和钢管的弹塑性,通过FRP管有无达到极限状态判断试件是否破坏,提出FRP与钢双管约束混凝土应力-应变关系理论模型,理论计算曲线与试验曲线吻合较好。在理论模型基础上对FRP与钢双管约束混凝土应力-应变曲线进行参数分析,考察FRP管类型、空心率、钢管径厚比、混凝土强度以及钢管强度对混凝土应力-应变曲线的影响,研究表明FRP管类型、空心率和混凝土强度对应力-应变曲线有影响,钢管径厚比和钢管强度几乎没有影响。
Under the condition of plane strain, the mechanical analysis of FRP-steel-concrete composite double-column is carried out, and the elasto-plasticity of concrete and steel pipe is considered. Whether the test piece is damaged or not is judged by whether or not the FRP pipe reaches the limit state. - strain relationship theory model, the theoretical calculation curve and the experimental curve are in good agreement. Based on the theoretical model, the stress-strain curves of FRP and steel double-tube confined concrete were analyzed. The effects of FRP pipe type, hollow ratio, diameter-to-thickness ratio of steel pipe, concrete strength and steel pipe strength on stress-strain curve of concrete were investigated. The type of FRP pipe, the hollowness and the strength of concrete have an effect on the stress-strain curve. Steel pipe diameter-thickness ratio and steel pipe strength have almost no effect.