FRP厚度及胶层性能对梁破坏的影响

纤维增强材料(FRP)加固钢筋混凝土结构已经得到广泛应用,但胶层性能对加固结构承载力的影响仍未形成可供参考、应用实际的理论体系。本文将利用有限元程序ANSYS分析梁界面的破坏过程,利用虚功原理建立FRP加固混凝土梁的非线性有限元方程,结合算例对梁的加载破坏过程承载力进行分析,并初步研究胶层特性及FRP布厚度对梁承载力的影响。结果表明胶层的极限剪应变越大,即韧性越好,承载能力越大;FRP布对钢筋混凝土梁结构进行修补,可以明显提高承我能力,且随着FRP厚度增加,承载力逐渐变大,但FRP太厚不仅增加成本,而且容易引起覆盖层的提前破坏。

Fiber reinforced plastics （FRP） reinforced concrete structure has been widely used, but the rubber performance impact on the bearing capacity of reinforced structure is still not form for reference and practical theory system. This article will analysis beam failure process of the interface with the finite element program ANSYS, using the virtual work principle to establish nonlinear finite element equations of FRP reinforced concrete beam, combined with the example of the beam load bearing capacity of failure process is analyzed, and preliminary study sub features and FRP thickness effect on the bearing capacity of beams. Results show that the ultimate shear strain, the greater the rubber is the better the toughness, the greater the carrying capacity; FRP cloth to repair of reinforced concrete beam structure, can obviously increase the bearing capacity, and with the increase of thickness of FRP, the bearing capacity increases gradually, but not only increase the cost of FRP is too thick, and easy to cause coating damage in advance.