Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (8): 76-82，88.

• Architecture & Civil Engineering • Previous Articles     Next Articles

Experimental Investigation into Fire Resistance of Reinforced Concrete Beams Strengthened in Flexure with Carbon Fiber Sheets

Wu Bo  Wan Zhi-jun   

  1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-08-17 Revised:2008-10-29 Online:2009-08-25 Published:2009-08-25
  • Contact: 吴波（1968-），男，博士，研究员，主要从事结构抗灾研究． E-mail:bowu@scut.edu．cn.
  • About author:吴波（1968-），男，博士，研究员，主要从事结构抗灾研究．
  • Supported by:

    国家“十一五”科技支撑计划子课题（2006BAJ03A03-12）;教育部科学技术研究重点项目（108106）;教育部博士学科点专项科研基金资助项目（20060561014）;亚热带建筑科学国家重点实验室重点研究项目（2008ZA10）

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Abstract:

Three-side fire tests of one unstrengthened reinforced concrete （RC） beam and five RC beams strengthened in flexure with carbon fiber sheets （CFSs） were carried out to reveal the influences of such factors as thicklayered fire coating thickness, load ratio and CFS-strengthening ratio on the fire resistance of the strengthened beams. Test results show that （ 1 ） the failure modes of the strengthened beams at high temperature can be classified as a flexure failure mode and a flexure-shear one ; （2） the flexure failure of the strengthened beams at room temperature may change at high temperature; （3） as compared with the unstrengthened beam, the strengthened beams with higher load are of stronger fire resistance due to the existence of fire coating; and （4） the increase of the strengthening ratio may result in the improvement of fire resistance and the change of failure mode. It is thus concluded that, by reasonably setting the fire insulation layer, the fire resistance of RC beams strengthened in flexure with CFSs well satisfies the requirements of practical engineering.

Key words: carbon fiber sheet, flexual strengthening, reinforced concrete beam, fire resistance