Corrosion Resistant Rehabilitation of Offshore Structures by Using FRP

利用 FRP 进行海上结构物的耐腐蚀修复

• 批准号: 12555275
• 负责人: KAGEYAMA Kazuro
• 金额: $ 6.02万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555275/
• 关键词: FRP; MP Method; Composite Materials; Repair; Adhesive; Rehabilitation; Toughness; Marine Environment; 接着; FRP補修

Strength of structure repaired with externally bonded FRP sheet depends on bonding strength between FRP sheets and substrate. It is important to evaluate a bonding strength between FRP sheets and substrate. Numerous researchers have noticed debond and peel during tests and have voiced concern related to this mode of failure. Further investigations into mechanisms of peel and the characteristics of the composites-substrate interface during debonding and peeling are thus critical to understanding both design requirements and long-term use potential of composite plates as a means of rehabilitation of infrastructure elements. In this study, we investigated about two topics : First is durability of a single notch beam repaired with externally bonded composite under fatigue loading, second is environmental durability of steel attached with externally bonded composite in marine environment.A single edge notched beam repaired with externally bonded CFRP sheet was analyzed under three-point-ben … More ding load based on linear elastic fracture mechanics. Reduction of stress intensity factor at the crack tip was calculated theoretically. The increase in fatigue strength of test specimens reinforced with various CFRP sheet patches was confirmed experimentally. Resistance effects of crack propagation under fatigue loading were also evaluated experimentally. Crack growth of a repaired specimen was controlled by the effective stress intensity factor proposed in the present paper.The environmental durability of steel members reinforced by external FRP sheets was successfully evaluated in marine environment based on the proposed "Membrane Peeling" test method. Four kinds of CFRP sheets were prepared : four resins, epoxy, vinyl ester, isophthalic and orthophthalic polyester resin. The bonding strength of steel member reinforced by epoxy resin was found to be as twice as strong that of steel member reinforced by the others resin before these test specimens were immersed in seawater. On the other hand, steel member reinforced by epoxy resin got most decreased debonding strength after immersion in seawater for one month. Bonding strength degraded immediately after immersion for six months, because CF-Vinyl ester and CF-Isophthalic resin were showed interface peeling between CF sheet and substrate. After immersion for twelve months, bonding strength deteriorated due to change of fracture mode. Less

外贴FRP片材修补结构的强度取决于FRP片材与基材之间的粘结强度。评价FRP片材与基材之间的粘结强度是重要的。许多研究人员在测试过程中注意到脱粘和剥离，并对这种失效模式表示担忧。剥离和剥离过程中的复合材料-基材界面的特性和剥离机制的进一步调查，因此，理解复合材料板的设计要求和长期使用潜力的基础设施元件的康复手段是至关重要的。本文主要研究了两个方面的问题：一是外贴复合材料修复单缺口梁在疲劳荷载作用下的耐久性;二是外贴复合材料加固钢结构在海洋环境中的环境耐久性 ...更多信息 基于线弹性断裂力学的冲击载荷。从理论上计算了裂纹尖端应力强度因子的折减。用各种CFRP片材修补件加固的试件的疲劳强度的增加被实验证实。疲劳载荷下的裂纹扩展阻力效应也进行了实验评估。本文提出的有效应力强度因子控制了修复试件的裂纹扩展，并基于提出的“薄膜剥离”试验方法，成功地评估了海洋环境下外贴FRP加固钢构件的环境耐久性。制备了环氧树脂、乙烯基酯树脂、酚醛树脂和邻苯二甲酸聚酯树脂四种树脂的CFRP片材。在海水浸泡前，环氧树脂加固钢构件的粘结强度是其他树脂加固钢构件的两倍。另一方面，环氧树脂加固的钢构件在海水中浸泡一个月后，剥离强度下降最多。浸渍6个月后，CF-乙烯基酯树脂和CF-间苯二甲酸树脂在CF片材与基材之间出现界面剥离，粘结强度立即下降。浸泡12个月后，由于断裂模式的改变，结合强度下降。少

项目成果

K.Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Duracosys 2001-5th international Conference on Durability Analysis of Composite Systems. 124-128 (2001)

K.Kageyama：“界面特性控制复合材料外部修复基础设施的耐久性”Duracosys 2001 年第五届国际复合材料系统耐久性分析会议。

K. Yamaguchi, I. Kimpara, K. Kageyama and M. Takanashi: "Durability of Steel Members Reinforced by FRP Sheet in Marine Environment"US-Japan Conference on Composite Materials. 555-562 (2000)

K. Yamaguchi、I. Kimpara、K. Kageyama 和 M. Takanashi：“海洋环境中 FRP 板增强钢构件的耐久性”美日复合材料会议。

山口晃司, 金原勲, 影山和郎, 高梨正祐: "FRPシートによる鋼構造補修システムにおける海水環境中の接着強度評価に関する研究"日本造船学会論文集. 188号. 719-726 (2000)

Koji Yamaguchi、Isao Kanehara、Kazuo Kageyama、Masuke Takanashi：“使用 FRP 板材的钢结构修复系统在海水环境中的粘合强度评估研究”日本造船学会学报 188. 719-726 (2000)。

K.Yamaguchi, I.Kimpara, K.Kageyama, M.Takanashi: "Durability of Steel Members Reinforced by FRP Sheet in Marine Environment"US-Japan Conference on Composite Materials. 555-562 (2000)

K.Yamaguchi、I.Kimpara、K.Kageyama、M.Takanashi：“海洋环境中 FRP 板增强钢构件的耐久性”美日复合材料会议。

K.Yamaguchi, I.Kimpara, K.Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Durability Analysis of Composite Systems 2001. 19-25 (2002)

K.Yamaguchi、I.Kimpara、K.Kageyama：“界面特性控制复合材料外部修复基础设施的耐久性”复合材料系统的耐久性分析 2001. 19-25 (2002)