動的荷重下における鉄筋とコンクリートの付着応力-すべり関係式

动载作用下钢筋与混凝土的粘着应力-滑移关系

• 批准号: 04650425
• 负责人: 島 弘
• 金额: $ 1.41万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650425/
• 关键词: 付着応力-すべり関係; 動的荷重; 載荷速度; 局所付着応力; ひずみ分布; 異形鉄筋; コンクリート強度; 鉄筋径

本研究の目的は,動的荷重下において付着構成則に及ぼす荷重速度の影響を明らかにし,時間の影響が考慮できる付着構成式を定成化することである.研究方法および成果は,1.実験・・・・・断面が40cm×40cmのコンクリートブロックの中心に埋め込んだ鉄筋の引抜き試験を行った.実験条件は荷重速度として,衝撃荷重から静的荷重までに相当する数段階の荷重速度でそれぞれの供試体に載荷した.その結果から得られた新たな知見は,以下のものである.(1)鉄筋とコンクリートの付着応力-すべり関係は,載荷速度によって大きく影響される.(2)載荷速度が異なるときの最大付着応力は,載荷速度の対数に対して直線的に変化する.(3)載荷速度が異なるときの付着応力-すべり関係の曲線形は,静的試験から得られた付着応力-すべり曲線を付着応力の軸方向に拡大・縮小することで表すことができる.2.定式化・・・・・上記の動的引抜き試験の実験結果に基づいて付着応力-すべり関係に及ぼす荷重速度の影響の定式化を行った.定式化は,申請者らが過去に静的荷重下で求めた付着応力-すべり-ひずみ関係の考え方に基づいて,これに荷重速度の影響を取り入れた.その結果は,(1)動的荷重下における鉄筋とコンクリートの付着応力-すべり関係は,τ(ε)=f'c^<2/3>(1.94+0.153logε)(1-exp(‐40s^<0.6>))で精度よく表すことができることが明らかになった.

The purpose of this study is to clarify the influence of dynamic load on the composition and load velocity, and to consider the influence of time on the composition. 1. The cross section is 40cm×40cm. The conditions are load velocity, impact load, static load, load velocity, load on the test specimen. The result is that the new knowledge is available, and the following is available. (1)The relationship between the load and the velocity of the steel bar is discussed. (2)Load velocity variation and maximum load force variation, load velocity variation and linear variation. (3)The curve shape of the relationship between the load velocity and the applied force is different. The curve shape of the relationship between the load velocity and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The curve shape of the relationship between the applied force and the applied force is different. The formula is formulated as follows: the applicant shall obtain the force to be paid under the static load in the past- The result is: (1) The relationship between the dynamic load and the applied force is τ(ε)=f'c^&lt;2/3&gt;(1.94+0.153logε)(1-exp(‐40s^<0.6>)).