Strengthening reinforced concrete beam with Ultra High Performance Concrete

Abstract

Many researchers studied and used different materials to strengthen and rehabilitate the concrete beam, we know that the concrete beam is a structure element that can be deformed from applying loads to it and there are two types of deformations to the concrete beam shear failure and flexure failure. Examples of such materials include carbon polymer fiber concrete (CFRP), glass polymer fiber concrete (GFPR), shape memory alloy (SMA) and ultra high performance concrete (UHPC)... etc . In this thesis, analysis and investigation to strengthen concrete beam sample using UHPC from practical experience, comparing results with finite element method. The study of parameters in this research is the thickness of the ultra-performance concrete layer where different thicknesses will be used 20,40,50mm, the length of the ultraperformance concrete layer where the length will be changed to 370mm at the beginning and end of the sample and 370mm in the middle and the shear reinforcement ratio. The results of tested beams showed the beneficial effects of strengthening the RC beams using UHPC, as evident from enhancement of the shear capacity and shifting of the failure mode from brittle to ductile with more stiff behavior