Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (2): 1-5.

• Mechanics •     Next Articles

Effect of Environmental Temperature on Load-Carrying Capacity of RC Beam Strengthened with CFL

Huang Pei-yαn  Zhang Bo-lin  Yang Yi  Zhou Zhi-lin   

  1. School of Traffic and Communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-11-18 Online:2007-02-25 Published:2007-02-25
  • Contact: 黄培彦(1952-)，男，教授，博士生导师，主要从事疲劳与断裂力学、桥梁加固新材料与新技术研究。 E-mail:pyhuang@scut. edu.cn
  • About author:黄培彦(1952-)，男，教授，博士生导师，主要从事疲劳与断裂力学、桥梁加固新材料与新技术研究。
  • Supported by:

    国家自然科学基金资助项目(10272047,10672060) ;广东省自然科学基金资助项目(020856 )

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Abstract:

The load-carrying capacity of the reinforced concrete( RC) beam strengthened with carbon fiber laminate (CFL) under different failure modes in the temperature field was theoretically analyzed. The results show that the environmental temperature affects the load-carrying capacity of the strengthened RC beam to a certain degree , and the details are: (1) when the CFLs are in the thickness of o. 1 , o. 2 , o. 3 and o. 4 mm , the cracking loads of the strengthened beams respectively increase by 5.37%, 10.46%,15.9% and 20.94% at a temperature increase of 30 K; (2) the strengthened RC beams with the CFL thickness of o. 1 and o. 2mm are of a failure mode of tension fracture and a decreasing extreme load-carrying capacity in an increasing temperature field , the decrease being less than 3.5% ; and (3) the strengthened RC beams with the CFL thickness of 0.3 and O. 4mm are of a failure mode of concrete crush and an increasing extreme load-carrying capacity with the environmental temperature , the increase being less than 3. 5 % .

Key words: carbon fiber laminate ( CFL) , thermal stress, load-carrying capacity, cracking load, reinforced concrete ( R C) beam