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首页> 外文期刊>Journal of Composites for Construction >Effect of Temperature Variation on the Full-Range Behavior of FRP-to-Concrete Bonded Joints
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Effect of Temperature Variation on the Full-Range Behavior of FRP-to-Concrete Bonded Joints

机译：温度变化对FRP-混凝土粘结节点全范围行为的影响

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摘要

Service temperature variations (thermal loadings) may significantly affect the behavior of the bond between externally bonded fiber reinforced polymer (FRP) and concrete. This paper presents an analytical solution for the full-range deformation process of FRP-to-concrete bonded joints under combined thermal and mechanical loadings. The solution is based on a bilinear bond-slip model and leads to closed-form expressions. The validity of the solution is demonstrated through comparisons with both experimental results and finite-element predictions. Numerical results from the solution are presented to illustrate the effect of thermal loading on the interfacial shear stress and slip distributions in addition to the global load-displacement response. Provided the material properties are not affected by temperature variations, a temperature rise is shown to increase the ultimate load, whereas a temperature reduction decreases the ultimate load; the latter can have serious implications for the safety of the strengthened structure. Although the solution is developed with particular reference to FRP-to-concrete bonded joints, it is also applicable to similar bonded joints made of other materials (e.g., FRP-to-steel bonded joints). A useful function of the closed-form solution lies in the interpretation of pull test results: the solution allows the effect of thermal stresses to be isolated from the effect of property changes of the bondline in obtaining bond-slip responses from pull tests.
机译：使用温度变化（热负荷）可能会显着影响外部粘结的纤维增强聚合物（FRP）与混凝土之间的粘结性能。本文提出了一种在热和机械载荷共同作用下玻璃钢-混凝土粘结节点的全范围变形过程的解析解决方案。该解决方案基于双线性键滑模型，并得出闭合形式的表达式。通过与实验结果和有限元预测的比较证明了该解决方案的有效性。给出了该解决方案的数值结果，以说明热载荷对界面剪应力和滑移分布的影响，以及整体载荷-位移响应。如果材料特性不受温度变化的影响，则表明温度升高会增加极限载荷，而温度下降会减小极限载荷；后者可能对加固结构的安全性产生严重影响。尽管该解决方案是专门针对FRP到混凝土的粘结接头而开发的，但它也适用于其他材料制成的类似粘结接头（例如，FRP到钢的粘结接头）。封闭形式的解决方案的有用功能在于对拉力测试结果的解释：该解决方案可以将热应力的影响与从拉力测试中获得粘结滑移响应的粘结层特性变化的影响相隔离。

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