Residual Performance and Damage Restorability of Reinforced Concrete Flexural Column after Earthquake

钢筋混凝土受弯柱震后残余性能及损伤恢复能力

• 批准号: 11650600
• 负责人: TASAI Akira
• 金额: $ 2.3万
• 依托单位: Yokohama National University (2000)Osaka Institute of Technology (1999)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650600/
• 关键词: Reinforced Concrete; Earthquake; Column; Axial Capacity; Shear Deterioration; Epoxy; Fiber Model; Truss and Arch Mechanism; トラス; アーチ; 付着割裂; 損傷限界; 曲げ降伏; 補修; 修復性

The axial capacity of reinforced concrete columns during shear deterioration after flexural yielding was investigated. The restorability of the axial capacity after the deterioration was also studied. Five column specimens with the same dimensions, reinforcement and materials were tested. They were designed that the shear capacity was equivalent to the flexural capacity. They were subjected to lateral forces in a cyclic manner producing anti-symmetric bending moment distribution under a constant axial load equivalent to 0.2σ_B in the compressive stress level (σ_B : compressive strength of concrete). Each specimen was loaded in the axial direction after corrected the residual deformation by the lateral loading.The following conclusions were obtained.(1) It was observed that the deterioration of the axial strength was caused by dominant diagonal shear cracks in the mid-span of columns, and the deterioration was significantly large immediately after the shear cracks occurred.(2) The analysis based on truss and arch mechanisms well predicted the deterioration of axial strength, which related strongly the deterioration of concrete compressive stress of strut in truss mechanism(3) The injection of epoxy into the diagonal shear cracks was effective to recover the lateral and axial strength perfectly.

研究了柔性屈服后剪切定义期间钢筋混凝土柱的轴向容量。还研究了定义后的轴向容量的可靠性。测试了具有相同尺寸，加固和材料的五列标本。他们被设计为剪切能力等效于柔性容量。在压缩应力水平（σ_B：混凝土的压缩强度）下，它们以循环方式进行横向力，在恒定轴向载荷下产生抗对称弯曲矩分布。校正后，通过横向负荷校正了残余变形后，每个样品都在轴向方向上加载。获得以下结论。（1）观察到，轴向强度的恶化是由柱中跨度中的对角线剪切裂纹引起的，在柱中跨度中的较大剪切裂纹引起，而在剪切裂缝中的档案中，造成了较大的档次，并在剪切裂缝后立即进行了分析。轴向强度强烈地确定了桁架机制中支柱的混凝土压缩应力（3）将环氧树脂注入对角线剪切裂纹可有效恢复横向和轴向强度。

项目成果

渡辺篤,田才晃: "柱のせん断劣化過程における残存軸耐力と損傷修復性"コンクリート工学年次論文集. 22・3. 337-342 (2000)

Atsushi Watanabe、Saiaki Ta：“柱剪切劣化过程中的残余轴向强度和损伤可修复性”混凝土工程年报 22・3（2000 年）。

大杉泰子,田才晃 他: "せん断余裕度の小さい柱の軸耐力の劣化に関する実験的研究"日本建築学会大会学術講演梗概集. C-2. 143-146 (2000)

Yasuko Osugi、Saiaki Ta 等：“小剪切裕度柱轴向强度恶化的实验研究”日本建筑学会会议记录 C-2（2000 年）。