Investigation of flexural behaviour of structural timber beams strengthened with NSM basalt and glass FRP bars

• 20 four-point bending tests on timber beams. NSM BFRP and GFRP reinforced beams were studied. The flexural behaviour was improved by FRP reinforcement. A theoretical model able to predict the strength presented. Near Surface Mounted (NSM) fibre polymer (FRP) bars is an effective technique of improving performance Despite potential technique, literature remains limited, whilst there not any standard method for prediction capacity. Extending pool experimental data thus understanding strengthened structures, present paper reports study with glass basalt bars. Moreover, presents a general in order estimate moment resistance examined white spruce specimens two reinforcement configurations; one only tension zone both compression zone. Control also included comparison purposes. All had rectangular cross-section 70 × 215 mm loaded under configuration 2.3 m span. total tested displacement control quasi-static monotonic loading. main failure mechanism observed unreinforced brittle tensile at load–deflection curves, strain distribution profiles modes discussed. It that significant increase ultimate load (33–69%) stiffness (22–33%) can be achieved due proposed assessed basis test results collated data, showing good between results.