An experimental investigation on flexural behavior of RC beams strengthened with prestressed CFRP strips using a durable anchorage system

Young Chan You, Ki Sun Choi, JunHee Kim

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

This paper investigates the effectiveness and feasibility of a prestressed carbon fiber-reinforced polymer (CFRP) system for strengthening reinforced concrete (RC) beams. The proposed prestressing system with a novel anchorage allows the utilization of full capacity of the CFRP strips. Eight small-scale and two large-scale concrete beams strengthened different configuration of prestressed CFRP strips are tested under static loading conditions up to failure. The main parameters considered include the level of prestressing applied, ranging from 20% to 70% of the tensile strength of the CFRP strips, and the use of mechanical anchorages at both ends of the CFRP strips. Thanks to the durable anchorage, the full range of flexural behavior was investigated including post-debonding. The results indicate that the beams strengthened using prestressed CFRP strips exhibited a higher first-cracking, steel-yielding, and experimental nominal moments as the level of prestressing force increased up to a certain point. After analyzing prestress effects in small scale tests, an optimum prestress level for strengthening concrete beams using CFRP strips is proposed and verified in large scale tests.

Original languageEnglish
Pages (from-to)3026-3036
Number of pages11
JournalComposites Part B: Engineering
Volume43
Issue number8
DOIs
Publication statusPublished - 2012 Dec 1

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Carbon fibers
Reinforced concrete
Polymers
Prestressing
Concretes
Steel
Strengthening (metal)
Debonding
carbon fiber
Tensile strength

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "This paper investigates the effectiveness and feasibility of a prestressed carbon fiber-reinforced polymer (CFRP) system for strengthening reinforced concrete (RC) beams. The proposed prestressing system with a novel anchorage allows the utilization of full capacity of the CFRP strips. Eight small-scale and two large-scale concrete beams strengthened different configuration of prestressed CFRP strips are tested under static loading conditions up to failure. The main parameters considered include the level of prestressing applied, ranging from 20{\%} to 70{\%} of the tensile strength of the CFRP strips, and the use of mechanical anchorages at both ends of the CFRP strips. Thanks to the durable anchorage, the full range of flexural behavior was investigated including post-debonding. The results indicate that the beams strengthened using prestressed CFRP strips exhibited a higher first-cracking, steel-yielding, and experimental nominal moments as the level of prestressing force increased up to a certain point. After analyzing prestress effects in small scale tests, an optimum prestress level for strengthening concrete beams using CFRP strips is proposed and verified in large scale tests.",
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An experimental investigation on flexural behavior of RC beams strengthened with prestressed CFRP strips using a durable anchorage system. / You, Young Chan; Choi, Ki Sun; Kim, JunHee.

In: Composites Part B: Engineering, Vol. 43, No. 8, 01.12.2012, p. 3026-3036.

Research output: Contribution to journalArticle

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