Analysis of the UHP-SFRCC(Ultra High Performance Steel Fiber Reinforced Cementitious Composites) I section Prestressed beam.

초고강도 섬유보강 시멘트 복합체 I형 프리스트레스트 보의 거동 해석

  • 한상묵 (금오공과대학교 토목환경공학부) ;
  • 김성욱 (한국건설기술구조연구부) ;
  • 강수태 (한국건설기술구조연구부) ;
  • 강준형 (금오공과대학교 토목환경공학부)
  • Published : 2005.11.01

Abstract

The objective of this paper is to investigate and analyze the behaviour of prestressed I section structural members constructed with ultra high perfomance steel fiber reinforced cementitious concrete (SFR-UHPC). This material is known as reactive powder concrete (RPC) mixed with domestic materials and its compressive strength is over 150MP. The parameters of test specimens were span to depth ratio, prestressing force, prestressing wire placement and web width. Most influential parameter to determine the failure mode between shear and flexural action was proved to be shear span ratio. The characteristics of ultra high-strength concrete is basically brittle, but due to the steel fiber reinforcement behaviour of this structure member became ductile after the peak load. As a result of the test, the stress block of compressive zone should be redefined. The proposed analytical calculation of internal force capacity based by plastic analysis gave a good prediction for the shear and flexural strength of specimens. The numerical verification of the finite element model which constitutive law developed for Mode I fracture of fiber reinforced concrete correctly captured the overall behaviour of the specimens tested.

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