Experimental-Analytical Study of CFRP strengthening Effect of Reinforced Concrete Beams with Web Opening under Torsion and Bending

— The strength of reinforced concrete beams is reduced to high extent when openings are created in their webs, so it is necessary to strengthen these beams by any modern strengthening methods to restore the strength of the beams before openings are created in their webs to continue in use of these beams. Analytical study is presented in this research to study CFRP strengthening effect around created opening in reinforced concrete beams under torsion and bending. The research depends on finite element method using Ansys 15. It is used SOLID65 to model concrete beam, SOLID 185 to model CFRP, supports and steel arms, and LINK 181 for long steel and stripes. Then analytical model is built to model reinforced concrete beams. This model gives results which are closed to experimental results.