疑似ひずみ硬化性引張挙動を有する短繊維補強セメント複合材料の設計ガイドライン : その1 マイクロメカニクス理論に基づく初期ひび割れ強度の推定方法

概要

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High performance short fiber reinforced cementitious composites, named as engineered cementitious composites (ECC), have been realized with reaching several percent of tensile strain capacity. The ultimate purpose of this study is to establish material design scheme for ECC, and this establishment necessitates to predict first cracking strength. This study proposed micromechanics-based prediction theory for first cracking strength, which takes into account: 1) fiber rupture during bridging action on a crack plane, and 2) chemical bond in interface between fiber and matrix. This theory was substantiated in comparison with tensile test data of ECC. In addition, analysis with this theory revealed that first cracking strength can be controlled via maximum fiber bridging stress, which is analytically expressed as a function of constitutive parameters of ECC such as bond strength. As a result, one can design ECC so as to have first cracking strength more than requirement using the proposed theory.
社団法人日本建築学会の論文
2001-01-30