Bond characteristics of CFRP plated concrete members under elevated temperatures
Bond characteristics of CFRP plated concrete members under elevated temperatures
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DOI：
10.1016/j.compstruct.2006.04.068
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发表时间：
2006-09
影响因子：
6.3
通讯作者：
J. Gamage;R. Al-Mahaidi;M. Wong
中科院分区：
文献类型：
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作者：
J. Gamage;R. Al-Mahaidi;M. Wong
火灾引起的结构退化是结构构件安全设计的一个挑战。碳纤维布（CFRP）加固混凝土构件的粘结性能随温度的变化而退化。因此，在进一步应用该系统之前，需要对复合材料的热效应进行详细研究。本文重点介绍了一个三维模型，预测火灾下的CFRP-混凝土复合材料的行为。采用传热学分析方法对高温下构件最关键部位环氧树脂粘接层内的温度进行了预测。该模型表明，在标准火灾下，环氧树脂在短时间内达到失效点。该模型还用于预测两小时和三小时耐火水平所需的绝缘厚度要求。通过数值分析论证了升温速率对复合材料结构粘结强度的影响。模型结果与实验数据进行了验证。
Fire related structural degradation is a challenge to the safe design of structural members. Carbon fibre reinforced polymer (CFRP) strengthened concrete members show degradation of bond properties with temperature. Therefore, a detailed investigation of heat effects on composites is required before further application of this system can be effective. This paper focuses on a 3D model developed to predict the behaviour of CFRP–concrete composites under fire. Heat transfer analysis was employed to predict the temperature within the adhesive layer of epoxy, which is the most critical part of the member at high temperature. The model showed that the epoxy reached the failure point within a short time under standard fire. The model was also used to predict the required insulation thickness requirement for two-hour and three-hour fire resistance levels. The effects of rate of temperature increase on bond strength of composite structures are demonstrated through numerical analysis. The model results were validated with experimental data.