初始缺陷对FRP加固混凝土柱破坏形式的影响

通过理论分析、有限元软件模拟以及试验验证来研究初始缺陷对碳纤维增强复合材料(Carbon FiberReinforced Plastics,CFRP)加固混凝土圆柱的力学性能和破坏形态影响。从宏微观角度定性分析初始缺陷对加固混凝土柱力学性能的影响;通过数值模拟与实验结果的对比,分析了轴压和偏压作用下带有初始缺陷的CFRP加固混凝土柱力学性能;研究了包裹层数、截面尺寸因素影响下的临界缺陷值的变化规律,论证了初始缺陷尺寸的改变对破坏形式的影响。

Failure mechanism of FRP reinforced concrete column with initial defects

The effect of initial defect size on the mechanical behavior and failure pattern of CFRP (Carbon Fiber Reinforced Polymer)-confined concrete columns was investigated through theoretical analysis,numerical simulation and experiment validation.Qualitative theoretical analysis was firstly explored to study the effect of initial defect size on the integrity of FRP-confined concrete from macro to micro perspective.Numerical analysis and experimental investigation were then carried out and compared to investigate the failure mechanism of FRP-confined concrete column with initial defects under axial compression force and eccentric compression force.The variation of defect criticality was investigated by varying the layer number of CFRP and cross-section size of concrete columns.The effect of initial defect size on the failure mechanism of CFRP-confined concrete columns was finally demonstrated.