Counterplan for earthquake disaster of concrete structures deteriorated due to reinforcement corrosion and alkali-aggregate reaction

钢筋锈蚀及碱骨料反应导致混凝土结构地震灾害对策

• 批准号: 08305013
• 负责人: KOJIMA Takayuki
• 金额: $ 11.97万
• 依托单位: Ritsumeikan University (1997-1998)Kyoto University (1996)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08305013/
• 关键词: Reinforcement corrosion; Alkali-aggregate reaction; Concrete structure; Plan to counter earthquake disaster; Shear reinforcement; Continuous fiber sheet

Earthquake resistance of concrete structures deteriorated by carbonation of concrete, reinforcement corrosion due to chloride ion or expansion due to alkali-aggregate reaction was examined. The following results can be drawn.(1) Sufficient strength and deformation were obtained, even when desalination was applied to PC beams. The brittle failure such as the breaking of prestressing bar due to the hydrogen enibrittlement was not observed.(2) Shear strength of concrete decreased, when RC beams deteriorated due to alkali-aggregate reaction were applied to the reverse loading.(3) The pattern of fatigue failure of RC beams deteriorated due to alkali-aggregate reaction changed from fatigue breaking of main reinforcement to crushing of concrete. Fatigue strength of RC beam will decrease, when the deterioration due to alkali-aggregate reaction is large.(4) Same effect of shear reinforcement as the sound RC beam was obtained, when deteriorated RC beams were reinforced by using continuous fiber sheet.(5) The damage elements, bond elements between steel and concrete or reinforcements and concrete were proposed and developed, and RC pier damaged, repaired or strengthened were analyzed by the FEM using these elements.

检查了混凝土结构的地震耐药性，通过混凝土的碳酸化，氯离子引起的钢筋腐蚀或由于碱 - 聚集反应而引起的膨胀。可以绘制以下结果。（1）即使在PC梁上应用淡化时，也获得了足够的强度和变形。易碎的失败，例如由于氢气的打破钢筋的破坏而没有观察到。（2）当RC梁由于碱性反应而恶化时，混凝土的剪切强度降低了。 具体的。当由于碱性凝集反应而导致的恶化很大时，RC束的疲劳强度将减小。（4）剪切增强的效果与声音RC光束相同，而当使用连续的纤维板通过连续的纤维板增强质量的RC束。使用这些元素通过FEM分析。

项目成果

K.Higashino: "Shear Reinforcement of RC Beam by Using Continuous Fiber Sheet" Proceedings of Japan Concrete Institute. Vol.20 No.1. 443-448 (1998)

K.Higashino：“使用连续纤维板的 RC 梁抗剪加固”日本混凝土学会论文集。

R.V.Shitindi: "Stress-Strain Behavior of Concrete Confined by FRP" Material Science Research International, JSMS,. Vol.4 No.3. 163-170 (1998)

R.V.Shitindi：“FRP 约束混凝土的应力应变行为”国际材料科学研究，JSMS，。

S.Nakamura: "Electrochemical Approach to Reinforcement Corrosion in Concrete with Blast Furnace Slag" Proceedings of the Japan Concrete Institute. Vol.20 No.1. 305-310 (1998)

S.Nakamura：“高炉矿渣混凝土中钢筋腐蚀的电化学方法”日本混凝土协会会议录。

渡辺佳彦: "塩害により劣化したRC部材の高流動コンクリートによる補修" コンクリート工学年次論文報告集. Vol.20 No.1. 383-388 (1998)

Yoshihiko Watanabe：“使用高流动性混凝土修复因盐害而恶化的 RC 构件”《混凝土工程年论文集》第 20 卷第 383-388 期（1998 年）。

別府万寿博: "衝撃的突き上げを受けるRC橋脚模型の帯鉄筋の影響に関する一考察" コンクリート工学年次論文報告集. Vol.20 No.3. 967-972 (1998)

别府世博会：“钢筋对 RC 桥墩模型的影响研究”混凝土工程年论文集第 20 卷第 967-972 期（1998 年）。