Second, a 4ENF beam on two-parameter elastic foundation model (BEF), which incorporates the effect of the crack tip deformation on compliance, is developed to analyze the 4ENF specimen for mode II fracture of bi-material bonding interface.

• 在4ENF粘聚模型的研究中，FRP和混凝土视为弹性材料，界面的剪切应力和裂纹剪切位移服从双线性粘聚法则，基于经典的Euler-Bernoulli梁理论，得到界面破坏不同阶段(即弹性阶段、弹性-软化阶段、弹性-软化-脱粘阶段)梁的界面剪应力及变形的解析解，为全方位理解4ENF的断裂过程提供了理论依据。