FRP片材外加固混凝土粘结界面断裂模型
首发时间:2014-05-09
摘要:本文对FRP片材外加固混凝土的FRP-混凝土界面断裂模型进行了综述和对比。分别通过利用刚性节点模型、半刚性节点模型和柔性节点模型以及数值分析的方法,对统一的双材料界面断裂试件,在竖向荷载作用和等效弯矩作用下,随裂缝扩展变化的正交化能量释放率进行了分析和比较。结果表明:刚性节点模型低估了试件的断裂柔度,只得到应变能量释放率的近似解;半刚性节点模型也低估了裂纹尖端的断裂柔度和应变能量释放率;柔性节点模型引入两个界面柔度参数来描述剪应力和法向应力作用下界面上的剪切变形,因此大大提高了断裂参数的计算精度。
关键词: 界面力学与表面力学 刚性节点模型 半刚性节点模型 柔性节点模型 能量释放率 界面断裂模型
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Bonded Interface Fracture Models of Concrete Externally Reinforced by FRP Plates
Abstract:In this paper, the fracture models on FRP-concrete bonded interface are summarized and compared for concrete structures externally reinforced with FRP plates. The energy release rates of the unified model of bi-material interface fracture specimens under the transverse and moment loads by the rigid, semi-rigid, and flexible joint models are compared. The results show that the classical rigid joint model under-evaluates the compliance, and it thus predicts the approximate energy release rate of the specimen. The semi-rigid joint model also under-evaluates the compliance and energy release rate of the specimen. The flexible joint model introduces two interface compliance coefficients to describe the crack tip deformation under the shear stress and normal stress, and it thus improves the calculation accuracy of both the compliance and energy release rate.
Keywords: interface mechanics and surface mechanics rigid joint model semi-rigid joint model flexible joint model energy release rate interface fracture models
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