Development and Application on Verification Analysis for Embedment Performance of Reinforcement

钢筋埋置性能验证分析方法的开发与应用

• 批准号: 18560465
• 负责人: NAKAMURA Hikaru
• 金额: $ 2.45万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560465/
• 关键词: Concrete Structure; Rigid-Body-Spring Method; Bond; Meso-Scale Analysis; 内部ひび割れ; 定着

The purpose of this Study is the development and application on embedment performance verification analysis of reinforcement based on Rigid-Body-Spring Model(RBSM). In the developed analysis, the lug of rebar was modeled in Meso-scale conceptThe following results were achieved in this study.(1) It was clarified that modeling of concrete behavior in front of lugs and contact behavior between concrete and lug was important, when the bond behavior is evaluated by the Meso-scale analysis. Therefore, the Meso-scale analysis is able to be highly accurate by constructing these models, and the development of the embedment performance evaluation analysis was shown.(2) It was shown that the bond behavior can be evaluated accurately by modeling the lug shape of rebar such as lug angle, lug interval, and lug height. This means the shape design of reinforcement to the bond is possible, when new reinforcement is developed.(3) The applicability of developed Meso-sacale analysis to a real problem was confirmed by comparing test results in which the effect on bond behavior of cover thickness was investigated.(4) The mechanism of the effect on bond behavior of cover thickness was cleared in Meso-scale analysis. In case of thinner thickness cover concrete, the bond strength is decided by the localized internal crack's reaching on the surface. On the other hand, the bond behavior was influenced by both the propagation of internal cracks and the compressive failure of concrete in front of lugs. This result is meant that the mechanism of the embedment performance is able to clarify analytically

本研究的目的是发展及应用基于刚体弹簧模型的钢筋嵌固性能验证分析。在所开发的分析中，钢筋的凸耳是在细观尺度的概念建模，以下结果在本研究中取得。(1)通过细观尺度分析评价粘结性能时，对耳片前混凝土性能和耳片与混凝土之间的接触性能进行建模是非常重要的。因此，通过构建这些模型，可以实现高精度的细观分析，并展示了嵌入式性能评价分析的发展。(2)结果表明，可以通过模拟钢筋的凸耳形状，如凸耳角度，凸耳间隔，和凸耳高度准确地评估粘结性能。这意味着，当开发新的钢筋时，可以对钢筋进行形状设计。(3)通过对比试验结果，研究了保护层厚度对粘结性能的影响，证实了发展的Meso-Sacale分析对真实的问题的适用性。(4)细观分析揭示了保护层厚度对粘结性能影响的机理。在保护层较薄的情况下，粘结强度主要取决于局部内部裂缝到达表面的程度。另一方面，粘结性能受到内部裂缝的扩展和耳前混凝土的压缩破坏的影响。这一结果意味着能够从分析上阐明嵌固性能的机理

项目成果

鉄筋の腐食ひび割れ解析のための腐食膨張モデルの検討

钢筋腐蚀裂纹分析的腐蚀扩展模型研究

• 发表时间: 2007
• 作者: 奥松 俊博;岡林 隆敏;Jawaid Bashir Ahmad;田代 大樹;出口 浩二;河村圭亮
• 通讯作者: 河村圭亮