Experimental study on shear performance of RC beams strengthened with NSM CFRP prestressed concrete prisms

This paper presents an experimental investigation of the shear performance RC beams strengthened with near surface mounted (NSM) carbon fibre reinforced polymer (CFRP) prestressed concrete prisms (PCPs). The behaviour can be affected by several design variables. In this research, effect following parameters were considered: prestress level, inclination and spacing CFRP-PCPs, material type prism. control beam had conventional steel reinforcement only while other seven CFRP-PCPs varying mentioned above. All tested under monotonic loading until they reached failure load. results showed that NSM strengthening technique improves effectively. applied at 45° more efficient in improving capacity compared to vertical CFRP-PCPs. deformation enhanced increase prestressing levels CFRP rods decrease spacing. modes influenced mainly Moreover, prism little influence on effectiveness strengthening. analytical model presented was developed estimate contribution found predict well.