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基于约束混凝土提出一种由钢筋、混凝土及缠绕管组成的内置复合材料管局部约束混凝土组合柱(ConcreteEncased FRP Confined Concrete Sub-Columns/Cores Column,简称“CEFC”),本构件截面形式为外围的钢筋混凝土类方柱和内置于4角点的FRP管约束混凝土圆柱(Concrete-Filled FRP Tube,简称“CFFT”)组合而成。通过试验研究及有限元数值模拟对钢筋混凝土柱及内置复合管局部弱约束混凝土方柱进行了轴偏压作用下力学行为的分析和比较。结果表明,弱约束CEFC典型破坏模式为局部破坏,内置CFFT可较好延缓构件整体破坏。CEFC在轴压和偏压作用下延性都有所提高,且在偏压作用下CEFC具有明显的二阶刚度,且承载力具有小幅度提高。
Based on the constrained concrete, a built-in composite material reinforced concrete (CFRP) composite reinforced Concrete Sub-Columns / Cores Column (“CEFC”) consisting of steel bar, concrete and winding pipe is proposed. Reinforced concrete square columns and built-in 4 corner points of the FRP tube confined concrete columns (Concrete-Filled FRP Tube, referred to as “CFFT”) combination. The mechanical behaviors of reinforced concrete columns and local weakly confined concrete square columns with built-in composite pipes under axial bias were analyzed and compared through experimental research and finite element numerical simulation. The results show that the typical failure mode of the weakly constrained CEFC is partial failure, and the built-in CFFT can delay the overall failure of the component. The ductility of CEFC under axial compression and bias is increased, and the CEFC has obvious second-order stiffness under bias and the bearing capacity has a small increase.