CFRP/GFRP混杂加固混凝土梁胶层界面应力有限元分析

Finite element analysis of the interfacial stress of concrete beams strengthened with hybrid CFRP/GFRP composites

建立了CFRP/GFRP混杂纤维布加固混凝土梁有限元模型,采用数值方法研究了不同HFRP弹性模量、不同胶层厚度、不同胶层弹性模量下胶层的剪应力、正应力和混凝土梁底面的第一主应力变化情况。通过对比分析,研究这些参数对CFPR/GFRP混杂纤维布加固工程结构界面粘结力学性能的影响,揭示了胶层剪应力、正应力和界面混凝土第一主应力对纤维布剥离破坏的影响。

A finite element model which agrees closely with the existing theory is presented for the interface stress analysis of hybrid CFRP/GFRP composite strengthening concrete beams with various parameters.The nonlinear finite element method is used to study the effect of various Young＇s module of HFRP,various thickness of glue layer and various Young＇s module of the glue on the interface shear stress ,normal stress and the first principle stress of the lower side of the concrete.Several conclusions proposed will be useful for the practical engineering design of hybrid strengthening concrete beams.