Post-fire behavior of GFRP bars and GFRP-RC slabs

Omid Gooranorimi, Guillermo Claure, Francisco De Caso y Basalo, Wimal Suaris, Antonio Nanni

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Technologies developed over the last two decades have introduced the use of glass fiber reinforced polymer (GFRP) composite bars as reinforcement in concrete structures when corrosion of the steel reinforcement is likely to occur. Fire resistance of GFRP-reinforced concrete (RC) members is a potential concern that needs to be understood and addressed because of the susceptibility of GFRP bars to degradation at elevated temperatures. In this study, the residual strength of fire-exposed GFRP-RC slabs and the GFRP mechanical properties after furnace exposure were studied. Slabs reinforced with two different types of GFRP bar were exposed to a furnace fire and sustained threepoint bending, simulating the sustained service load (the moment due to dead load plus 20% of the moment due to live load at midspan), for 2 h. Upon completion of the fire test, the residual slab strength was assessed using a quasi-static flexural test up to failure. Next, GFRP bars were extracted from the selected locations of the slabs to evaluate the residual mechanical properties, including shear strength (transverse and horizontal) and glass transition temperature (Tg). The GFRP-RC slabs with both bar types did not experience apparent reduction in flexural capacity after a 2-h fire test that generated a maximum temperature of 115°C at the bar surface. The GFRP transverse shear strength decreased whereas the horizontal shear strength and Tg slightly increased.

Original languageEnglish (US)
Article number04017296
JournalJournal of Materials in Civil Engineering
Volume30
Issue number3
DOIs
StatePublished - Mar 1 2018

Keywords

  • Fire test
  • Glass fiber reinforced polymer (GFRP)
  • Mechanical testing
  • Reinforced concrete (RC) slabs
  • Residual capacity

ASJC Scopus subject areas

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

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