International Journal of Civil & Structural Engineering
Author(s) : ALI ZAIDI , HIZIA BELLAKEHAL
Fiber reinforced polymer (FRP) bars have become progressively more used in civil engineering because of their excellent properties with respect to steel bars, mainly, their corrosion resistance. The designers generally adopt over-reinforced sections to avoid a sudden failure mode of FRP bars. Therefore, the overlap of the bars is omnipresent. However, under high temperature, the area of overlap may be regarded as a zone of radial stresses concentration generated by pressure caused by the thermal expansion of both bars. The aim of this study is to develop an analytical model allows to investigate the thermal stress and strain distributions in FRP bars and in concrete of beams reinforced with two overlapped FRP bars. By varying the ratio of concrete cover thickness to FRP bar diameter (c/db) from 1 to 3.2 and the temperature variation from 0°C to 60°C. The analytical model is based on the linear elasticity. Analytical results are compared with those obtained from numerical model using ADINA finite elements software. The results predicted from the proposed model are in good agreement with numerical results.