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初期ひび割れ制御に用いる若材齢コンクリートと鉄筋の付着性状に関する研究

初期裂缝控制用新拌混凝土与钢筋粘结性能研究

基本信息

批准号：
07J10145
负责人：
三村陽一
金额：
$ 0.58万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2007
资助国家：
日本
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07J10145/
关键词：
若材齢付着応力すべり

项目摘要

本研究では,実構造物における応力状態や定着状況を模擬した両引き付着応力実験を行い,それを基に定着長が充分に長い場合における若材齢コンクリートと異形鉄筋の付着応力-すべり関係を求めた.また,付着性状に影響する鉄筋近傍のコンクリートに生じる内部ひび割れの観察を行った.主要な成果は下記のとおりである.1.異型鉄筋近傍に生じる内部ひび割れ観察実験により,若材齢ほど鉄筋周辺のモルタルでは内部ひび割れが発生しやすく,特に材齢1日では鉄筋のごく近傍に多くのひび割れが発生することを確認した.2.すべりの評価定着長が充分に長い異型鉄筋とコンクリートがともに引張力を受けるとき,片引き実験とは境界条件が異なるものの,鉄筋ひずみとコンクリートの断面平均ひずみの差をもってすべりを定義することで,鉄筋軸に沿った任意の位置における付着応力-すべり関係は,各材齢において概ね同じ曲線で表すことができることを示した.3.付着応力-すべり関係の材齢変化若材齢期においては,材齢に応じて付着応力-すべり関係が異なる曲線状を呈したものの,定着長が充分に長い場合においても,圧縮強度の2/3乗で局部付着応力を正規化することで,付着応力-すべり関係が概ね同じ曲線状となり,材齢2日以降の局部付着性状におよぼすコンクリート水和度の影響を低減できることを示した.4.定着長の影響材齢2日以降における付着応力-すべり関係は,定着長にかかわらず同様の曲線形状となり,定着長の異なる付着応力-すべり関係は,推定最大付着応力を定数倍することで表現できる可能性を示した.

The purpose of this study is to determine the strength of the structure of the creation. in this study, the structure of the creation is in the state of force, and the basis of the study is to make sure that the structure is full of strength and strength. Please tell me that the character is in the vicinity of the tendon, so that the inside is cut and observed. Under the main "results", please do not know what to do. 1. The shape of the rib is close to the rib, and the internal part of the rib is cut. If the rib is cut, the rib is cut, and the rib is cut. 2. The ribs are in full shape, the ribs are full, the ribs are loaded, the ribs are in the boundary conditions, the ribs are in the condition of the boundary, the ribs are in the condition of the boundary, the ribs are in the shape of the average cross-section, the ribs are defined, and the ribs are in any position to pay the force. All materials are similar to each other in the same table. 3. If the material is in the shape of a curve, it is in the shape of a curve, it is set to be full-length, the strength is 2-fold, the strength is 3-fold, the force is normalized, and the force is generally the same as that of the curve. After 2 days, the wood was partially affected by the temperature and the temperature. 4. It is assumed that the maximum force is several times higher than that of the long-term shadow. it is assumed that the maximum force is several times higher than that of the long-term shadow. it is assumed that the maximum force is several times the force, and the possibility is shown in the table.