MECHANICAL MODELS FOR COMPRESSION AND TENSION PROPERTIES OF POROSITY FREE CONCRETE WITH STEEL FIBER

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  • YANAGIDA Ryohei
    東京工業大学大学院 理工学研究科土木工学専攻
  • NAKAMURA Takuro
    東京工業大学 環境・社会理工学院 土木・環境工学系
  • KONO Katsuya
    太平洋セメント株式会社 中央研究所 第2研究部
  • NIWA Junichiro
    東京工業大学 環境・社会理工学院 土木・環境工学系

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Other Title
  • 鋼繊維で補強した無孔性コンクリートの圧縮・引張に対する力学モデル

Abstract

 This study aims to propose the mechanical models of fiber reinforced Porosity Free Concrete (PFC). The compression test, splitting cylinder test, and bending test of PFC specimens were conducted to investigate the mechanical properties of fiber reinforced PFC. The material characteristics of PFC such as the characteristic values for material strength, the compressive stress-strain relationships, and the the tension softening curve were proposed from each material test and the inverse analysis based on the results of three-point bending test, respectively. Furthermore, the size dependence of the flexural strength of fiber reinforced PFC was investigated through the four-point bending test and the finite element analysis with a discrete crack model. Based on the results of this FEM analysis, an equation to predict the flexural strength was proposed for PFC beams with the various height. Moreover, the equivalent specific length of fiber reinforced PFC beam with various height was also determined based on the numerical study using fiber modeling analysis. Finally, the tensile stress - strain relationships were obtained by the use of the equivalent specific length in order to convert the crack width of the tension softening curve into the strain.

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