具有混合纤维增强塑料片的混凝土梁–柱联接部位的加固

中文字数:4841,中文页数:13  英文字数:3015 页数:15

Abstract                                                              The paper describes the results of tests on prototype size reinforced concrete frame specimens which were designed to represent the column–beam connections in plane frames. The tests were devised to investigate the influence of fibre reinforced plastic (FRP reinforcement applied to external surfaces adjacent to the beam–column connection on the behaviour of the test specimens under static loading. Of particular interest under static loading was the influence of FRP reinforcement on the strength and stiffness of beam–column connection. As a key to the study, the hybrid FRP composites of E-glass woven roving (WR) and plain carbon cloth, combined with chopped strand mat (CSM), glass fiber tape (GFT) with a vinyl-ester resin were designed to externally reinforce the joint of the concrete frame. The results show that retrofitting critical sections of concrete frames with FRP reinforcement can provide signification strengthening and stiffening to concrete frames and improve their behaviour under different types of loading. The selections of types of FRP and the architecture of composites in order to improve the bonding and strength of the retro-fitting were also discussed.
Author Keywords: Concrete structure; Strengthening; Rehabilitation; Hybrid FRP composite; Wrapping technique

摘要
 本篇文章描述了对加固后标准尺寸混凝土结构试件进行试验的结果，该试件代表平面框架结构中的梁–柱联接部位。设计试验的目的是为了研究在静载条件下纤维增强塑料被应用到梁–柱联接部位外表面附近时对所测试件的影响。特别令人感兴趣的是在静载条件下应用纤维增强塑料对增强梁–柱联接部位所起的作用。作为研究的关键，为了从外部对混凝土的连接部分进行加固，设计了带有E玻璃无捻粗纱布和碳布的混合纤维增强塑料复合物，并且该复合物结合了短贴原丝毡和带有乙烯基酯树脂的玻璃纤维带。结果显示，对于应用纤维增强塑料改进过的混凝土结构的关键部分能够对混凝土结构的强度和硬度起到增强的作用，同时也能够起到在不同类型荷载条件下增强它们的效果。同时，本篇文章也讨论了为改进和增强混凝土结构的强度和硬度而如何选择纤维增强塑料和结构类型。
关键词：混凝土结构；加固；修复；混合纤维增强塑料；绕接技术

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