Basic characteristics of FRP strand sheets and flexural behavior of RC beams strengthened with FRP strand sheets

A. Kobayashi, Y. Sato, Y. Takahashi

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)

Abstract

When attaching continuous fiber sheets on concrete members on site, bonding defection of the continuous fiber sheets likely happens. FRP strips could solve the problem associated with the continuous fiber sheets, though they also have demerit due to less adhesion property caused by small adhesive area. To solve these problems, we have developed advanced FRP strand sheets which consist of bunch of individually hardened continuous fiber strands. The FRP strand sheets can be easily attached on the surface of concrete members with a single adhesive. Thus, the advanced strand sheets assure better construction quality and enable to cut down on application time and/or costs. Series of tensile, lap splice, and bonding tests were conducted in order to evaluate the material characteristics of CFRP strand sheets. Bending test of RC (Reinforced Concrete) beams was also conducted to evaluate strengthening effect of the CFRP strand sheets. In each test, specimens strengthened with CFRP strand sheets, with ordinal carbon fiber sheets or with CFRP strips were prepared. In the bending test, it was observed that both bending stiffness and capacity of RC beams were increased by strengthening with CFRP strand sheets. It was also observed that ultimate load, which was determined by delamination of strengthening material; of specimen strengthened with CFRP strand sheets was the greatest among all the specimens. Furthermore, the influence of concrete strength and depth of cover concrete on flexural strengthening effect of the FRP strand sheets were investigated.

Original languageEnglish
Pages93-98
Number of pages6
Publication statusPublished - 2009
Externally publishedYes
Event2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009 - Seoul, Korea, Republic of
Duration: 2009 Dec 92009 Dec 11

Conference

Conference2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009
CountryKorea, Republic of
CitySeoul
Period09/12/909/12/11

Keywords

  • CFRP strip
  • Continuous fiber sheets
  • Flexural strengthening
  • FRP strand sheets
  • Overlap splice strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Building and Construction

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