Fiber Reinforced Concrete (FRC) is believed to have a significant impact on crack control in steel-reinforced FRC (R/FRC). However, this potential has been less incorporated into design for structural applications. In this study, tensile tests on R/FRC were conducted using various types of FRC with different tension softening characteristics. The effects of variations in tension softening properties on the bond behavior of R/FRC members were investigated through tension stiffening effects and surface crack observations. The results revealed that R/FRC members exhibit superior tension stiffening effects when using FRC materials that maintain higher tensile stress after cracking. Additionally, these materials resist crack opening, demonstrating high crack dispersibility and less crack extension. Furthermore, it was indicated that crack width can be estimated based on its correlation with fracture energy.

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Influence of Tension Softening Properties on Bond Behavior of Reinforced Fiber Reinforced Concrete (R/FRC) with Various Short Fibers

  • Naoshi Ueda,
  • Yuta Nakamichi

摘要

Fiber Reinforced Concrete (FRC) is believed to have a significant impact on crack control in steel-reinforced FRC (R/FRC). However, this potential has been less incorporated into design for structural applications. In this study, tensile tests on R/FRC were conducted using various types of FRC with different tension softening characteristics. The effects of variations in tension softening properties on the bond behavior of R/FRC members were investigated through tension stiffening effects and surface crack observations. The results revealed that R/FRC members exhibit superior tension stiffening effects when using FRC materials that maintain higher tensile stress after cracking. Additionally, these materials resist crack opening, demonstrating high crack dispersibility and less crack extension. Furthermore, it was indicated that crack width can be estimated based on its correlation with fracture energy.