effects of using multilayers of high resistance afrp on loading capacity of reinforced concrete beams in comparison with low resistance afrp considering ebrog method

externally bonded reinforcement on grooves (ebrog) is a new method that has been introduced to postpone or eliminate debonding of frp sheets from concrete surface in concrete beams strengthened for flexure and increase loading capacity. for strengthening reinforced conceret beams in strructure, use of different types of frp like: laminate, afrp, cfrp, and gfrp. by there is some differences between these kinds related to sensitivity to temperature, shear sterength, the aim of the current study is to examine the efficiency of externally bonded reinforcement on grooves method on concrete beams' loading capacity when used under multilayers of high resistance afrp sheet and comparing it with the results of multilayers of low resistance afrp. for this purpose , beam specimens with dimension 120*140*1000 mm were modeled in abaqus program. according to the analysis, loading capacity is increased when used multilayers of high resistance afrp instead of using multilayers of low resistance afrp.  finally, diagram shown that use of multilayers of afrp has better results than use of one layer of afrp.