FRP型材-超高性能混凝土组合梁界面性能数值模拟

Numerical analysis of bond behavior of FRP profile-ultra-high-performance concrete composite beams

为了研究FRP型材-超高性能混凝土组合梁界面应力在荷载作用下的分布规律,通过ABAQUS对FRP型材-超高性能混凝土组合梁进行了数值模拟,选取适当的单元类型,材料属性和网格划分,并基于塑性损伤模型,研究了组合梁在弹性阶段界面应力沿Y、Z、YZ方向的分布规律。结果表明:混凝土塑性损伤模型能够较为准确的模拟FRP型材-超高性能混凝土组合梁的静载试验;且对于FRP型材-超高性能混凝土组合梁界面的应力分布进行了分析,发现界面黏结树脂的抗剪强度是组合界面承载力的控制条件,界面最大剪应力为抗剪强度的80.5%。

In order to study the distribution law of interface stress of FRP profile-ultra-high-performance concrete composite beam under load,the FRP profile-ultra-high-performance concrete composite beam was numerically simulated by ABAQUS,and the appropriate element type,material properties and meshing were selected.Based on the plastic damage model,the distribution of interfacial stress along the Y,Z and YZ directions of the composite beam in the elastic phase is studied.The results show that the concrete plastic damage model can accurately simulate the static load test of FRP profile-ultra-high-performance concrete composite beams.And for the FRP profile-ultrahigh-performance concrete composite beam interface,the shear strength of epoxy resin is the combined interface bearing.The control condition of the force,the maximum shear stress of the interface is 80.5%of the shear strength.