This research investigates the effects of applying different bond lengths for Carbon Fibre Reinforced Polymer (CFRP) strips used in flexural strengthening of steel I-beams. Wide range of the structural parameters i.e. load bearing capacity, failure mode, strain on CFRP, strain on adhesive, strain on steel beam, lateral deformation, and vertical deflection were investigated. Both numerical and experimental studies were employed. To simulate the specimens, ANSYS software in three dimensional (3D) modelling case and non-linear analysis method was utilized. In the experimental test, four-point bending method with static gradual loading was applied. Results indicate that using shorter CFRP bond lengths caused brittle behaviour, and applying longer CFRP bond lengths resulted in more flexible behaviour. Using different CFRP bond lengths affected the whole structural behaviours of the strengthened beams.
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