纤维增强复合材料加固混凝土梁受弯剥离承载力预测模型
Abstract: The purpose of this paper is to investigate prediction model for intermediate debonding load carrying capacity of reinforced concrete beam (RC) flexurally strengthened with fiber reinforced polymer (FRP) laminates. A mechanics analysis model of interface crack tip between FRP and concrete was established, which initiated from the root of the main flexural crack. Based on the mechanics analysis model and fracture mechanics theory, a formula for calculation of the energy release rate of interface crack was derived. By regarding the interface fracture energy as debonding criterion, a new prediction model for debonding load carrying capacity of the strengthened beam was proposed in the paper, which not only took into account the effects of bending moment and shear force, but also could directly caculate the debonding load rather than to be translated. Moreover, some experiments data were selected to verify the capability and accuracy of the proposed model. The research results show that the proposed model in this study could be safely and effectively predict the intermediate debonding load carrying capacity of RC beam strengthened with FRP laminates.
引 言
1.1 分析模型
1.2 应变能计算
2 加固梁界面剥离分析
2.1 中部开裂截面应力
2.2 界面剥离预测模型
3 实验验证
4 结语
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本文编号：239546
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