鋼繊維補強コンクリート部材の引張特性の寸法効果を考慮した断面設計に関する研究

概要

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Steel Fiber Reinforced Concrete (SFRC) is a new material with high tensile strength, flexural strength and toughness. However, it is known that tensile strength and flexural strength of SFRC components decrease as components sizes increase. In this paper, experimental and analytical studies were performed to investigate the influence of specimen sizes on the flexural characteristics of Steel Fiber Reinforced Concrete with main reinforcement. The analytical study is based on a fracture mechanics concept and an estimation of the tensile stress - strain relationship by means of a flexural analysis considering the tensile resistance of the SFRC on a standard beam specimen. The size effect on the tensile stress - strain relationship was considered by means of reducing both of the stress and strain by the ratio of flexural strength to the standard beam specimen. Flexural tests of the SFRC beam specimens with main reinforcement were performed to investigate the applicability of this method. As the results, the reasonable agreement was obtained between the measurements and the calculations on the yield moment and ultimate bending moment.
2007-03-01