Unidirectional Carbon Fibre Anchorage Length Effect on Flexural Strength Capacity For Concrete Beams

Concrete structures often require rehabilitation after years of service. The recent rapid developments in fibre reinforced polymers (FRP) opened the doors for a new era of rehabilitation, low production costs, light weight and durability of these products were the main properties that allowed to use it in many structural retrofitting and strengthening areas. Many studies focused on strength gain performance of the concrete elements when using different types and FRP formation. In addition to that, this study examined strength and pre-failure behaviour with three lengths categories, and constant moment zone loading application. Three categories of different carbon fibres strengthen length (Full, intermediate and short) along with a control beam were prepared and tested. The full length category showed an average of 24% strength gain, on the other hand, the intermediate category achieved similar strength gain 24%, and finally, short length category preformed poor in terms of strength gain and failed similarly to the control element. It was concluded that reducing the anchorage length up to a point before the concrete will tear-off will improve the strength performance comparing will extended anchorage lengths.