【摘要】 FRP加强是一种不损坏构件的结构补强方法，但FRP布与木结构界面存在纤维剥离问题，而忽略该问题的数值计算会产生较大偏差，故提出采用内聚力模型模拟胶层脱粘滑移现象的有限元分析方法。通过多组单剪试验的设计与实施，获得GFRP和CFRP两种材料与木材界面的应力-黏结滑移曲线，进而建立双线性黏结滑移本构模型。有限元分析中运用该黏结滑移本构关系建立了内聚力模型，对应单剪试验的有限元分析结果表明，基于内聚力模型的有限元分析能够准确地反映FRP-木材界面的黏结滑移性能；FRP加强型胶合木植筋梁柱节点的有限元分析结果表明，基于内聚力模型的分析结果较好地揭示了纤维片材的剥离情况。从受力性能、外观和造价等综合来看推荐采用GFRP加强木结构。更多还原

【Abstract】 FRP strengthening is a non-destructive method to strengthen structures. However, there is a problem of fiber delamination at the interface between FRP and wood structure, and moreover, the numerical calculation that ignores this problem will cause a large deviation. Therefore, the finite element analysis method is proposed to simulate the phenomenon of debonding and sliding of adhesive layer by using the cohesive model. The multiple sets of single shear tests were designed and implemented to obtain the stress-bonding slip curves of the interfaces between wood and two other kinds of materials, namely GFRP and CFRP, and a bilinear bonding slip constitutive model was established. The bonding slip constitutive relation is used to establish the cohesive model in the finite element analysis, and the finite element analysis results corresponding to the single shear tests show that the finite element analysis based on the cohesive model can accurately reflect the bond-slip performance of the FRP-wood interface. The finite element analysis results of the FRP-strengthened beam-column joints in glued laminated timber show that the analysis results based on the cohesive model can better reveal the delamination of the fiber sheet. Considering comprehensively the mechanical performance, appearance and cost, GFRP is recommended for the strengthened of wood structures.更多还原