Investigation on an effective bond arrangement of insulated CFRP-strengthened flexural members for improved thermo-mechanical performance

Application of insulation on Carbon Fiber Reinforced Polymer (CFRP) strengthened concrete members in building s is essential to preserve the structural integrity during the fire. Investigation on suitable bonding techniques to minimize the usage of insulation without affecting the structural performance may lead to a cost optimum solution for re trofitting projects. An experimental program was conducted to compare the thermal and structural performance of groove d and external bonding techniques. A total of 15 CFRP - Concrete members were exposed to different fire scenarios with and without insulatio n. A numerical model was also developed to predict the effects of sensitive parameters on the thermo - mechanical performance of CFRP/Concrete composite s under standard fire. The results indicated that the application of CFRP laminates in a groove within the nominal cover of the member can save up to 36% of the insulation than the external bonding technique. This study provides d esign recommendations in the form of charts for easy guidance to select a suitable bonding technique, insulation type and applicatio n depending on the feasibility of the project.