关键词: 碳纤维薄板(CFL) , 温度应力, 承载力, 开裂载荷, 钢筋混凝土(RC) 梁

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