Rehabilitation Systems of Damaged Infrastructures by Using Carbon Fiber Sheets

碳纤维布修复受损基础设施系统

• 批准号: 07555316
• 负责人: KIMPARA Isao
• 金额: $ 7.17万
• 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 (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555316/
• 关键词: Rehabilitation; Infrastructures; Carbon Fibers; Reinforcing Effect; Acoustic Emision; Fracture Toughness; Energy Release Rate; Bonding Strength; アコースティックエミション; 破壊靭性; AE法; 相関はく離; 接着界面; 構造モデル; 強度低下; 層間はく離

Much attention has been paid in recent years to rehabilitation of damaged infrastructures by using composite wrap such as fiber reinforced plastics (FRP) sheets as external reinforcements. The purpose of this study is to make a quantitative clarification of the reinforcing effects of carbon fiber sheets bonded on damaged infrastructures and to give a theoretical basis to establish a rehabilitation system by using composite wrap.(1) A mechanical model was proposed based on linear elastic fracture mechanics to investigate the reinforcing effect for strength reduction due to a crack, the bonding strength and the failure modes in view of the rehabilitation of cracked beams by using composite wrap. A three-point flexure test method was devised in which a single edge notched concrete beam specimen strengthened externally by bonding unidirectional FRP sheets on the bottom tensile zone to evaluate the reinforcing effects quantitatively.(2) The above test method was applied to concrete and mort … More ar beam specimens with and without a center notch with carbon fiber sheets bonded through the actual spot processing in view of evaluating rehabilitation as reinforcing and repair. The failure process as well as load, strain and crack opening displacement behavior were monitored by detecting acoustic emission (AE) activity and by AE moment tensor analysis. The relation between reinforcing effect and fracture toughness at the initiation of AE activity was discussed based on these results.(3) A new peeling test method to evaluate bonding strength between FRP sheets and concrete was proposed in which a thin FRP sheet was bonded on a concrete block and out-of-plane force was applied to FRP sheet to propagate debonding. This test method gave a good measure to characterize a peeling strength and examine the effects of different surface treatment and primer in terms of energy release rate. A simplified data reduction method was also proposed to measure the energy release rate based on the deformation of membrane. Less

近年来，通过使用诸如纤维增强塑料（FRP）板的复合包裹物作为外部增强物来修复受损基础设施受到了很多关注。本研究的目的是定量地阐明碳纤维布对受损基础设施的加固效果，并为利用复合材料包裹物建立修复体系提供理论依据。(1)基于线弹性断裂力学理论，建立了复合材料加固梁的力学模型，研究了复合材料加固梁对裂纹强度降低的加固效果、复合材料加固梁的粘结强度和破坏模式。设计了一种三点弯曲试验方法，通过在底部受拉区粘贴单向纤维增强塑料布对单边缺口混凝土梁试件进行外部加固，以定量评价加固效果。(2)将上述试验方法应用于混凝土和水泥 ...更多信息 为了评估加固和修复的修复效果，通过实际现场处理，对带有和不带有中心切口的碳纤维板的ar梁试件进行了粘结。通过检测声发射（AE）活动和AE矩张量分析监测破坏过程以及载荷、应变和裂纹张开位移行为。在此基础上讨论了声发射活动开始时的强化效应与断裂韧性的关系。(3)提出了一种新的剥离试验方法来评估FRP片材与混凝土之间的粘结强度，在该方法中，将薄FRP片材粘结在混凝土块上，并对FRP片材施加面外力以传播剥离。该测试方法给出了表征剥离强度和检查不同表面处理和底漆在能量释放率方面的影响的良好测量。提出了一种简化的基于膜变形的能量释放率测量方法。少

项目成果

Z.W.Li et al.: "Evaluation of Fracture Behavior of FRP Reinforced Concrete Beams by Moment Tensor Analysis" Proc.11th National Conference on Acoustic Emission. 85-90 (1997)

Z.W.Li等人：“通过力矩张量分析评估FRP钢筋混凝土梁的断裂行为”Proc.11th全国声发射会议。

I.Ohsawa et al.: "Failure Process and Acoustic Emission Properties of FRP Reinforced Mortar" Proc.10th National Conference on Acoustic Emission. 201-206 (1994)

I.Ohsawa 等：“FRP 增强砂浆的失效过程和声发射特性”，第十届全国声发射会议论文集。

I.Kimpar et al.: "EXPERIMENTAL CHARACTERIZATION OF REINFORCING EFFECTS OF FRP SHEETS BONDED ON MORTAR AND CONCRETE BEAMS" Proc.11th International Confeence on Composite Materials. VI-16-25 (1997)

I.Kimpar 等人：“在砂浆和混凝土梁上粘合 FRP 板的增强效果的实验特性”Proc.11th 国际复合材料会议。

I.Ohsawa et al: "AE Characterization of Failure Process of Concrete Beams Reinforced with CFRP Sheets" Progress in Acoustic Emission VIII. 8. 127-132 (1996)

I.Ohsawa 等人：“CFRP 片材加固混凝土梁失效过程的 AE 表征”声发射进展 VIII。

I.Ohsawa et al: "AE Characterization of Failure Process of Concrete Beams Reinforced withCFRP Sheets" Progress in Acoustic Emission VIII. 8. 127-132 (1996)

I.Ohsawa 等人：“CFRP 板加固混凝土梁失效过程的 AE 表征”声发射进展 VIII。