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Fe modelling of CFRP-concrete interface subjected to cyclic temperature, humidity and mechanical stress

机译：循环温度，湿度和机械应力作用下CFRP-混凝土界面的Fe建模

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摘要

Modelling of environmental effects on the bond surface between FRP composites and concrete is crucial for the purpose of life prediction of strengthened members. The service performance of composite systems depends on the degree of chemical and physical aging of the system. Physical aging is a reversible process which is related mainly to temperature fluctuations. Chemical aging is the permanent molecular level degradation of fibres, resin or interfaces due to long-term exposure to the environment. The resulting strength reduction and the system behaviour due to aging are important in evaluating the strengthening of civil engineering infrastructure. In this paper, a finite element model is developed to predict the interface properties after long-term exposure to the cyclic temperature and the constant humidity. Effects of sustained loading are also taken into account. The predicted strength, cracks pattern, failure mode and strain variation along the bond line agree well with test results.
机译：对于玻璃钢复合材料和混凝土之间的粘结表面，环境影响的建模对于增强构件的寿命预测至关重要。复合系统的服务性能取决于系统化学和物理老化的程度。物理老化是一个可逆的过程，主要与温度波动有关。化学老化是由于长期暴露于环境而导致的纤维，树脂或界面的永久分子水平降解。由于老化导致的强度降低和系统行为对于评估土木工程基础设施的加强很重要。在本文中，开发了一个有限元模型来预测长期暴露于循环温度和恒定湿度后的界面特性。还考虑了持续荷载的影响。沿粘结线的预测强度，裂纹模式，破坏模式和应变变化与测试结果非常吻合。

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