• Title/Summary/Keyword: transuerse cracks

Search Result 1, Processing Time 0.014 seconds

Bond Characteristics of High-Strength Concrete (고장도 콘크리트의 부착특성에 관한 연구)

  • Lee, Joon-Gu;Mun, In;Yum, Hwan-Seok;Kim, Woo
    • Journal of the Korea Concrete Institute
    • /
    • v.13 no.5
    • /
    • pp.499-506
    • /
    • 2001
  • Eight direct tension tests were conducted to study the bond characteristics and crack behavior in high-strength concrete axial members. The main variable was the concrete strength up to 61-63 MPa. The specimens consisted of two different types of the short specimens modeled the part between transverse cracks and the long specimens having numerous transverse cracks. The results obtained show that the bond strength increases in proportion to compressive strength. Thereby, in high-strength concrete the length of stress-disturbed region is shortened and the space of adjacent transverse cracks become smaller. Although the concrete strength varies from 25 MPa to 61 MPa, the split cracking loads remain constant, while transverse cracking loads vary as variation of concrete tensile strength. Accordingly, the current code provisions for development length may need reconsideration in high-strength concrete members, and it is recommended that either thicker cover or transverse reinforcement should be additionally provided for high-strength concrete members.