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首页> 外文期刊>Journal of Composites for Construction >Nonlinear Deterioration Model For Bond Interfacial Fracture Energy Of Frp-concrete Joints In Moist Environments
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Nonlinear Deterioration Model For Bond Interfacial Fracture Energy Of Frp-concrete Joints In Moist Environments

机译：潮湿环境中Frp-混凝土接头粘结界面断裂能的非线性劣化模型

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摘要

This study proposed a bond mechanism based deterioration model of bond interfacial fracture energy for fiber-reinforced polymer (FRP)-concrete joints in moist environments. The bond interface region relative humidity (IRRH) in a moist environment was correlated to the bond fracture energy in this deterioration model. The IRRH-dependent interface separation tractions were derived in the frame of a cohesive zone model. Such an IRRH-dependent interface separation-traction law was simulated by a series of nonlinear interface elements attached to the bond interface to calculate the macroscopic load-displacement curves for the modified double cantilever beam (MDCB) specimens. Through moisture diffusion analysis, IRRH was determined as a function of the moisture exposure time for given specimen dimension and environmental RH. Using IRRH as the bridge, the time-dependent load-displacement curves of the MDCB specimens were obtained. The good agreement with the experimental data indicated that the model worked well. The approach developed in this study can be used to simulate and predict the durability of the bond between the FRP and concrete in moist environments.
机译：这项研究提出了一种基于粘接机理的潮湿环境下纤维增强聚合物（FRP）-混凝土接头粘结界面断裂能的劣化模型。在此劣化模型中，潮湿环境中的键界面区域相对湿度（IRRH）与键断裂能相关。 IRRH依赖的界面分离牵引力是在粘性区域模型的框架中得出的。通过连接到键界面的一系列非线性界面元素模拟了这种依赖IRRH的界面分离-牵引定律，以计算改进的双悬臂梁（MDCB）标本的宏观载荷-位移曲线。通过水分扩散分析，对于给定的样本尺寸和环境RH，IRRH被确定为水分暴露时间的函数。使用IRRH作为桥梁，获得了随时间变化的MDCB标本的荷载-位移曲线。与实验数据的良好一致性表明该模型运行良好。本研究开发的方法可用于模拟和预测在潮湿环境中FRP和混凝土之间的粘结耐久性。

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