Temperature Stress of Concrete Member Strengthened by CFRP

Considering the difference of thermal expansion coefficient between carbon fiber reinforced polymer (CFRP) and concrete, the equation on temperature self-restrained deformation due to solar radiation or uniform varying temperature is established for the concrete member with arbitrary cross-section strengthened by CFRP. Analytic formula of temperature stress is derived for rectangular-section and box-section concrete member under two temperature gradient modes: uniform distribution and exponent distribution. The parameters affecting temperature stress of concrete pier strengthened by CFRP is discussed, such as the thickness, the thermal expansion coefficient and the elastic modulus of CFRP as well as the elastic modulus of concrete, the width and the height. Analysis shows that whether or not to consider the temperature stress has a significant effect on Security of the concrete piers strengthened by CFRP, especially in colder region or under the sunlight radiation.