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.

对因混凝土碳化、氯离子引起的钢筋腐蚀或碱骨料反应引起的膨胀而恶化的混凝土结构的抗震性能进行了研究。可以得出以下结果：(1)即使对PC梁进行脱盐处理，也能获得足够的强度和变形。未观察到因氢脆而导致预应力筋断裂等脆性破坏。(2)当RC梁因碱骨料反应而劣化时，施加反向荷载时，混凝土的抗剪强度下降。(3)模型由于碱骨料反应从主筋的疲劳破坏转变为混凝土的破碎，RC梁的疲劳破坏恶化。当碱骨料反应引起的劣化较大时，RC梁的疲劳强度会降低。(4)当使用连续纤维板对劣化的RC梁进行加固时，获得了与完好RC梁相同的抗剪加固效果。(5 ）提出并开发了损伤单元、钢筋与混凝土或钢筋与混凝土之间的粘结单元，并利用这些单元对钢筋混凝土桥墩的损伤、修复或加固进行了有限元分析。

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，。

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）。

服部篤史: "連続繊維シート貼付けによる下水道コンクリート構造の補修・補強" 土木学会論文集V. No.599/V-40. 59-69 (1998)

Atsushi Hattori：“通过粘贴连续纤维板修复和加固下水道混凝土结构”日本土木工程师学会会刊 V. No.599/V-40 (1998)。