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首页> 外文期刊>Arabian Journal for Science and Engineering >Theoretical Analysis of Thermal Behavior of Overlapped GFRP Bars Embedded in Reinforced Concrete Beams
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Theoretical Analysis of Thermal Behavior of Overlapped GFRP Bars Embedded in Reinforced Concrete Beams

机译：钢筋混凝土梁中埋置的GFRP筋的热行为的理论分析

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摘要

Fiber-reinforced polymer (FRP) bars are being increasingly used in civil engineering constructions due to their excellent properties in comparison with steel bars, especially in terms of corrosion resistance. Designers generally adopt over-reinforced sections to avoid a sudden failure mode of FRP bars. Therefore, the overlap of the bars is omnipresent. However, under large temperature increase, the overlap area may be regarded as a zone of radial stress concentration generated by a pressure caused by the thermal expansion of both bars. Several studies have been conducted on the thermal behavior of FRP bars-reinforced concrete elements, but none of these studies has taken into account the overlapping effect of bars under high temperature. The aim of this study is to develop numerical and analytical models to predict transverse thermal strains and stresses in FRP bars interaction zone by varying the ratio of concrete cover thickness to FRP bar diameter (c/d(b)) from 1 to 3.2, and the temperature increases from 0 to + 60 degrees C for concrete beams reinforced with two overlapped glass FRP (GFRP) bars. The numerical model is developed using ADINA finite element software, and its results are compared with those obtained from the analytical model based on linear elasticity theory.
机译：纤维增强聚合物（FRP）钢筋由于其与钢筋相比的优异性能，尤其是在耐腐蚀性方面，正越来越多地用于土木工程结构中。设计人员通常采用过度加固的型材，以避免FRP筋突然失效。因此，条的重叠无处不在。然而，在大的温度升高下，重叠区域可被视为由两个杆的热膨胀引起的压力产生的径向应力集中的区域。已经对FRP钢筋混凝土构件的热性能进行了一些研究，但是这些研究都没有考虑高温下钢筋的重叠效应。这项研究的目的是通过将混凝土覆盖层厚度与FRP钢筋直径的比值（c / d（b））从1更改为3.2，从而开发数值和分析模型来预测FRP钢筋相互作用区域的横向热应变和应力，并且对于用两根重叠的玻璃纤维增​​强塑料（GFRP）钢筋加固的混凝土梁，温度从0升高到+ 60摄氏度。使用ADINA有限元软件开发了数值模型，并将其结果与基于线性弹性理论的分析模型得到的结果进行了比较。

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