Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects
Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects
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DOI：
10.3390/polym6030873
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发表时间：
2014-03-01
期刊：
影响因子：
5
通讯作者：
Bouhicha, Mohamed
中科院分区：
文献类型：
--
作者：
Bellakehal, Hizia;Zaidi, Ali;Bouhicha, Mohamed
大的温度变化对纤维增强聚合物（FRP）筋混凝土结构有不利影响。这是由于这些钢筋的横向热膨胀系数与硬化混凝土的横向热膨胀系数之间存在显著差异。这种差异会在FRP筋/混凝土界面处产生径向压力，并可能导致混凝土内出现劈裂裂缝。本文介绍了FRP加固混凝土板进行的实验和分析研究的结果，同时，热负荷和机械负荷。基于线弹性理论的分析模型包括评估热和机械载荷对FRP筋横向膨胀的综合影响。在这项调查中研究的参数是混凝土保护层厚度，FRP筋直径和温度变化。热循环从-30 ℃变化到+60 ℃。分析结果与实验结果的比较表明，该模型预测的横向应变与实验结果有很好的相关性。
The large temperature variation has a harmful effect on concrete structures reinforced with fiber reinforced polymer (FRP) bars. This is due to the significant difference between transverse coefficient of thermal expansion of these bars and that of the hardened concrete. This difference generates a radial pressure at the FRP bar/concrete interface, and may cause splitting cracks within concrete. This paper presents results of an experimental and analytical study carried out on FRP-reinforced concrete slabs subjected, simultaneously, to thermal and mechanical loads. The analytical model based on the theory of linear elasticity consists to evaluate combined effects of thermal and mechanical loads on the transverse expansion of FRP bars. Parameters studied in this investigation are the concrete cover thickness, FRP bar diameter, and the temperature variation. The thermal cycles were varied from -30 to +60 degrees C. Comparisons between analytical and experimental results show that transverse strains predicted from the proposed model are in good correlation with experimental results.