Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (2): 13-17,22.

• Mechanics • Previous Articles     Next Articles

Analysis of Multiple Cracking of Carbon Fiber Sheet-Reinforced RC Beam Under Four-Point Bending

Zeng Qing-dun1  Chen Xi-long1  Tan Cha-sheng2   

  1. 1. School of Traffic and Communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. School of Architecture and Civil Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2005-11-14 Online:2007-02-25 Published:2007-02-25
  • Contact: 曾庆敦(1956-)，男，教授，主要从事复合材料力学研究. E-mail:emqdzeng@scut. edu.cn
  • About author:曾庆敦(1956-)，男，教授，主要从事复合材料力学研究.
  • Supported by:

    国家自然科学基金资助项目( 10372032) ;广东省自然科学基金资助项目(031394)

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Abstract:

With the aid of the analytical methods of composite mechanics , a layered shear-lag model is established to investigate the multiple cracking of reinforced concrete (RC) beam reinforced with carbon fiber sheets under four-point bending. The relationships between the crack items and the applied load as well as the number of carbon fiber sheets are then obtained , where the crack items include the crack density and the maximum crack width in the reinforcement cover under the pure bending part of the beam. The calculated results are in good agreement with the xisting experimental ones , showing that (1) the crack density and width increase with the applied load; (2) with the increase of the number of carbon fiber sheets , the crack spacing obviously becomes small , while the maximum crack width almost remains constant; and (3) in the case of a small number of carbon fiber sheets , a cluster of sa-turation cracks emerge in the reinforcement cover under the pure bending part of the beam when the applied load reaches or exceeds a certain value.

Key words: carbon fiber sheet-reinforced concrete beam, four-point bending, shear-lag analysis, crack density, maximum crack width