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DOI:10.7672/sgjs2014160028
施工技术
CONSTRUCTION TECHNOLOGY
纤维网格加固桥梁水下结构试验研究
魏洋，吴刚，纪军，张敏3
2014年8月下第43卷第16期
（1.南京林业大学土木工程学院，江苏南京210037：2.东南大学混凝土及预应力混凝土结构教育部
重点实验室，江苏南京210096；3.北京特希达技术研发有限公司，北京100011）
［摘要】FRP网格以其轻质、耐腐蚀、易成型，在土木工程领域具有很好的应用前景。基于水下无排水施工思想，提技术效果，研究参数包括黏结材料类型（水下不分散砂浆、水下环氧树脂）、黏结材料浇筑条件（陆上浇筑、水下浇筑）。试验结果表明，FRP网格通过对加固结构核心混凝土的约束实现其承载力和变形能力的提高，黏结材料无论是水下不分散砂浆还是水下环氧树脂，都能够以无排水施工方式实现FRP网格加固水下结构的技术效果。黏结材料为水下环氧树脂的加固试件，其荷载-位移曲线表现出较为光滑的下降曲线，而黏结材料为水下不分散树脂的加
固试件，其荷载-位移曲线表现出阶梯形的下降曲线。但是，二者总体变形能力的区别并不显著。【关键词］桥梁工程；纤维增强复合材料；网格；水下结构；加固
【中图分类号］TU378.3
【文献标识码］A
【文章编号】1002-8498(2014)16-0028-05
Experimental Investigation on Bridge Structures Reinforced
by FRP Grids Underwater
Wei Yang',WuGang",Ji Jun',Zhang Min
(1. College of Civil Engineering, Nanjing Forestry Uninersity, Nanjing, Jiangsu 210037, Chind;
2. Key Laboratory for RC and PRC Structures of Education Ministry, Southeast Uninersity,
Nanjing, Jiangsu 210096, Chind; 3. Bejing Texrida R&D Co. , Lid. , Beijing 100011, China)
Abstract : FRP grids have an excellent application prospect in the field of civil engineering due to its ligh weight, corrosion resistance and easy formation. Based on the conception of construction underwater without water drainage, the construction technology of FRP grids reinforced bridge structures underwater was presented. Five groups consisting of fifteen cylindrical concrete specimens were prepared to investigate the efficiency of the FRP grids reinforced underwater structures. The main parameters were the type of bonding material (underwater non-dispersion mortar or underwater epoxy resin) and casting conditions of bonding material (land or underwater). Test results show that the load-carrying and deformation capacity of FRP grids reinforced specimens were enhanced by confining core concrete. Whether the bonding material was underwater non-dispersion mortar or underwater epoxy resin, the positive effects of FRP grids reinforced underwater structures could be achieved by the manner of no water drainage. When the bonding material is underwater non-dispersion mortar, the load-displacement curves of the specimens show a relatively smooth descending trend; when the bonding material is underwater epoxy resin, the load-displacement curves show a progressive and stepped descending trend. However, there is no significant difference in the overall deformability between them.
Key words : bridges ;fiber reinforced polymer (FRP) ; grids; underwater structures; reinforcement
纤维网格（FRP网格）是由纵、横正交的预浸纤*国家自然科学基金（51208262）；交通部西部交通建设科技项目（ 201131816980）：江苏高校优势学科建设工程资助项目（PAPD）
【作者简介］魏洋，工学博士，副教授，国家一级注册结构工程师
E-mail : wy78 @ njfu. edu. cn【收稿日期］2014-02-26
维筋所组成的网格状材料，其采用碳纤维、玻璃纤维、玄武岩纤维等高性能连续纤维浸渍树脂固化形成,FRP网格由于其独特的形态与特性在土木工程领域具有特殊的应用优势。采用FRP网格容易实现对混凝土梁、板、柱、砌筑墙体及隧道等结构的加固[1-10)，可以有效提高结构构件的承载力、延性和抗