http://www.iaeme.com/IJCIET/index.asp 574 editor@iaeme.com International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 02, February 2019, pp. 574-602, Article ID: IJCIET_10_02_057 Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=10&IType=02 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed EFFECTS OF BARS SLIPPAGE ON THE PRE- AND POST-HEATING FLEXURAL BEHAVIOR OF FRP REINFORCED CONCRETE BEAMS: EXPERIMENTAL AND THEORETICAL INVESTIGATIONS Rami J.A. Hamad International College of Engineering and Management, P.O. Box 2511, C.P.O Seeb, P.C. 111, Oman M. A. Megat Johari School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia Rami H. Haddad Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110 Irbid, Jordan ABSTRACT Using fiber reinforced polymer (FRP) bars as an alternative to traditional steel reinforcement solves durability problems in reinforced concrete structures. This study investigated the effects of bar slippage on the pre- and post-heating flexural response of concrete beams reinforced with different FRP and conventional steel bars. A total of twenty-four control and heat-damaged concrete beams with different FRP/steel bars were loaded (in triplicates) under a four-point loading configuration to evaluate their mechanical performance and failure modes while acquiring strains in tension steel and compression concrete. A new theoretical method was proposed to predict the load capacities of the beams with consideration of slippage between the FRP bars and surrounding concrete. The results were then compared with the load capacities computed using the ACI code that assumes a prefect bond between FRP bars and concrete. The post-heated concrete beams failed at a relatively low load capacity. They also presented an increase in deflection and ductility and a decrease in stiffness and total absorbed energy. The theoretical ultimate load of the FRP-RC beams, computed on the basis of the ACI code, was overestimated relative to the corresponding measured values. By contrast, the computations based on the actual