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首页> 外文期刊>Composite Structures >Experimental investigation on mechanical behavior of FRP-to-steel adhesively-bonded joint under combined loading-part 1: Before hygrothermal aging
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Experimental investigation on mechanical behavior of FRP-to-steel adhesively-bonded joint under combined loading-part 1: Before hygrothermal aging

机译：复合载荷作用下FRP与钢之间的粘结性能试验研究-第1部分：湿热老化前

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Due to various advantages of fiber-reinforced polymer (FRP) decks, the FRP-steel composite girder system is being increasingly used in new bridge constructions as well as rehabilitation projects for old bridges. This paper presents the first part of the research project, focusing on mechanical behaviors of adhesively-bonded joints between FRP sandwich decks and steel girders before hygrothermal aging. A specific tensile-shear loading device was designed with the capacity to provide the combination of tensile and shear loads in six different ratios. Ultimate failure loads, load-deformation behaviors and failure modes of un-aged adhesively-bonded joints were investigated experimentally and compared regarding to different loading angles. Under the shear loading, the failure of adhesive joints occurring in the adhesive layer was cohesive failure, at a location close to the steel support. Under the tensile and four combined loading conditions, the failure mode was the combination of fiber breaking (or FRP delamination) and interfacial adhesion failure between FRP sandwich deck and adhesive layer. Load-deformation curves indicated that the non-homogeneous characteristic of the adhesive layer was evident, which induced the eccentric loading on the adhesive joints and stress redistribution during the test process. The tensile-shear failure criterion of the adhesive joint was addressed, regarding to the vectorially separated tensile and shear stress. (C) 2014 Elsevier Ltd. All rights reserved.
机译：由于纤维增强聚合物（FRP）甲板的各种优势，FRP钢复合梁系统正越来越多地用于新的桥梁建设以及旧桥梁的修复项目中。本文介绍了该研究项目的第一部分，重点研究了湿热老化之前FRP夹心板和钢梁之间的粘结接头的力学性能。设计了一种特殊的拉伸剪切加载设备，该设备具有提供六种不同比率的拉伸载荷和剪切载荷的组合的能力。通过实验研究了未老化胶接接头的极限破坏载荷，载荷变形行为和破坏模式，并比较了不同载荷角。在剪切载荷下，在靠近钢支撑体的位置处，在粘合剂层中发生的粘合剂接头的破坏是内聚破坏。在拉伸和四种组合载荷条件下，破坏模式是纤维断裂（或FRP分层）和FRP夹心板与粘结层之间的界面粘结破坏的组合。载荷-变形曲线表明，胶粘剂层具有不均匀的特性，在试验过程中会引起胶粘剂接头的偏心载荷和应力的重新分布。针对矢量分离的拉伸应力和剪切应力，解决了胶粘接头的拉伸剪切破坏准则。 （C）2014 Elsevier Ltd.保留所有权利。

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