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动态加载下FRP与砖界面的粘结-滑移关系

The Bond-Slip Relationship at FRP-to-Brick Interfaces under Dynamic Loading.

作者信息

Zhang Di, Yang Jun, Chi Li Yuan

机构信息

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.

出版信息

Materials (Basel). 2021 Jan 23;14(3):545. doi: 10.3390/ma14030545.

DOI:10.3390/ma14030545
PMID:33498788
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7865457/
Abstract

Interface debonding between fiber reinforced polymers (FPR) and substrates is the principal failure mode for FRP-reinforced structure. To understand the bond-slip relationship at FRP-to-brick interfaces under dynamic loading, the influences of the dynamic enhancement of material performance on the bond-slip curve were studied. Single-lap shear tests under two different loading rates were performed, and the slip distribution curves at different loading stages were fitted to derive the bond-slip relationship. Then a numerical model considering the strain rate effects on materials was built and verified with test results. Further, the influences of brick strength, FRP stiffness and slip rate on the bond-slip relationship were investigated numerically. The research results show that FRP stiffness mainly influences the shape of the bond-slip curve, while brick strength mainly influences the amplitude of the bond-slip curve. The variations of the bond-slip relationship under dynamic loading, i.e., under different slip rates, are mainly caused by the dynamic enhancement of brick strength, and also by the dynamic enhancement of FRP stiffness, especially within a specific slip rate range. The proposed empirical formula considering dynamic FRP stiffness and dynamic brick strength can be used to predict the bond-slip relationship at the FRP-to-brick interface under dynamic loading.

摘要

纤维增强聚合物（FPR）与基体之间的界面脱粘是纤维增强复合材料（FRP）增强结构的主要失效模式。为了了解动态加载下FRP与砖界面的粘结-滑移关系，研究了材料性能动态增强对粘结-滑移曲线的影响。进行了两种不同加载速率下的单搭接剪切试验，并拟合了不同加载阶段的滑移分布曲线以得出粘结-滑移关系。然后建立了考虑材料应变率效应的数值模型，并通过试验结果进行了验证。此外，还通过数值方法研究了砖强度、FRP刚度和滑移率对粘结-滑移关系的影响。研究结果表明，FRP刚度主要影响粘结-滑移曲线的形状，而砖强度主要影响粘结-滑移曲线的幅值。动态加载下，即不同滑移率下粘结-滑移关系的变化主要由砖强度的动态增强引起，也由FRP刚度的动态增强引起，特别是在特定的滑移率范围内。所提出的考虑动态FRP刚度和动态砖强度的经验公式可用于预测动态加载下FRP与砖界面的粘结-滑移关系。

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