ABSTRACT

The use of the composite pultruded materials is increasing due to the particular characteristics of lightness, ease of installation, high corrosion resistance and, finally, lower maintenance costs. Even if the bolting technique is the most widely used, especially in the field of civil engineering re-adapting the rules valid for steel structures, thanks to several studies on adhesives, there is reason to believe that the best connection technique for pultruded profiles is gluing (the continuity of the fibers is guaranteed).

Current applications involving such materials, strictly related to the field of civil engineering, include bridges, pedestrian and the motorway bridges, roof structures, helipads, solar charging stations, offshore structures, cooling towers and lockgates. In some of these structures, the system (composite material and resin) is in contact with water. Even if there are several studies on the durability of composite pultruded material, current literature referring to adhesives between pultruded adherents needs further investigation. Within this framework, the paper aims to investigate, from an experimental and numerical point of view, the effect of the hygrothermal ageing on both the fracture energy in mode II as well as the strength and stiffness of two commercial epoxy resins taking into account the further effect of the desorption. Finally, in view of a safe design of a bonded joint, limiting its behaviour to the elastic field only, a lower fracture energy value is presented in relation to the classical one.

摘要

由于重量轻、易于安装、耐腐蚀性高以及维护成本低等特殊特性，复合拉挤材料的使用正在增加。即使螺栓连接技术使用最广泛，特别是在土木工程领域重新调整适用于钢结构的规则，由于对粘合剂的多项研究，有理由相信拉挤型材的最佳连接技术是胶合（保证纤维的连续性）。

目前涉及此类材料的应用与土木工程领域密切相关，包括桥梁、人行道和高速公路桥梁、屋顶结构、直升机停机坪、太阳能充电站、海上结构、冷却塔和闸门。在其中一些结构中，系统（复合材料和树脂）与水接触。即使有几项关于复合拉挤材料耐久性的研究，目前关于拉挤粘合剂之间的粘合剂的文献仍需要进一步研究。在此框架内，本文旨在从实验和数值的角度研究湿热老化对模式 II 的断裂能以及两种商业环氧树脂的强度和刚度的影响，同时考虑到进一步的解吸作用。最后，