The 15th International Conference on Fibre-Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-15) & The 8th Asia-Pacific Conference on FRP in Structures (APFIS-2022), 10-14 December 2022, Shenzhen, China.Analytical approaches are developed for predicting the flexural behaviour of reinforced concrete slabs strengthened with carbon fibre reinforced polymer (CFRP) laminates applied according to (i) near-surface mounted (NSM) and (ii) externally bonded reinforcement (EBR) as non-prestressed strengthening techniques, as well as according to the EBR with (iii) mechanical anchorage (MA) and with (iii) gradient anchorage (GA) systems as prestressed strengthening techniques. The approaches are based on a trilinear relationship of force-deflection curve, in which the formulations depend on the type of failure mode, strengthening type, and initial concrete and CFRP strains. In order to predict the ultimate load, different formulations existing in the literature for the calculation of the CFRP failure strain are applied and compared. Experimental results previously published by the authors are compared with the results from the developed analytical approaches and a good agreement is found.This work was carried out in scope of the project FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECM-EST/1282/2014) and Durable-FRP (PTDC/ECI-EGC/4609/2020) funded by national funds through the Foundation for Science and Technology (FCT) and co-financed by the European Fund of the Regional Development (FEDER) through the Operational Program for Competitiveness and Internationalization (POCI) and the Lisbon Regional Operational Program. This work was partly financed by FCT / MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020. This work is financed by national funds through FCT under grant agreement [DFA/BD/08403/2021] attributed to the first author
