누적손상을 고려한 강섬유보강 콘크리트의 피로파괴 특성

Fatigue Failure Characteristics of Steel Fiber Reinforced Concrete Considering Cumulative Damage

  • 김동호 (강원대학교 대학원) ;
  • 홍창우 (강원대학교 석재복합신소재제품연구센터) ;
  • 이주형 (강원대학교 석재복합신소재제품연구센터) ;
  • 이봉학 (강원대학교 공과대학)
  • 발행 : 2002.03.01

초록

Concrete containing discontinuous discrete steel fiber in a normal concrete is called steel fiber reinforced concrete(SFRC). Tensile as well as flexural strengths of concrete could be substantially increased by introducing closely spaced fibers which delay the onset of tension cracks and increase the tension strength of cracks. However, many properties of SFRC have not been investigated, especially properties on repeated loadings. Thus, the purposes of this dissertation is to study the flexural fatigue characteristics of SFRC considering cumulative damage. A series of experimental tests such as compressive strength, splitting tensile strength, flexural strength, flexural fatigue, and two steps stress level fatigue were conducted to clarify the basic properties and fatigue-related properties of SFRC. The main experimental variables were steel fiber fraction (0, 0.4, 0.7, 1, 1.5%), aspect ratio (60, 83). The principal results obtained through this study are as follows: The results of flexural fatigue tests showed that the flexural fatigue life of SFRC is approxmately 65% of ultimate strength, while that of plain is less than 58%. Especially, the behavior of flexural fatigue life shows excellent performance at 1.0% of steel-fiber volume fraction. The cumulative damage test of high-low two stress levels is within the value of 0.6 ∼ 1.1, while that of low-high stress steps is within the value of 2.4 ∼ 4.0.

키워드

참고문헌

  1. Cement and Concrete Research v.6 no.2 Tensile strength of steel fiber reinforced concrete Mangat,P.S.
  2. Transportation Research Record v.1110 Flexural fatigue strength of fiber reinforced concretes, endurance limit and impat strength Ramakrishnan,V.
  3. Rilem Symposium, Testings and Test Methods of Fibre Cement Composites Complete stressstrain curves for steel fibre reinforced concrete in uniaxial tension and compression Shah,S.P.(et al)
  4. Journal of the Korea Concrete Institute v.4 no.1 Flexural Fatgue Bechavior of Steel Fiber Reinforced Concrete Structures Son,Y.H.(et al.)
  5. ACI Journal SP v.44 The effect of steel fiber on the compressive strength of concrete. Fiber Reinforced Concrete Williamson,G.R.
  6. ACI Material Journal v.95 no.1 Fatigue performance in flexure of fiber reinforced concrete Zhang,J.;H.Stang