Influence of Compressive Strength Concrete on Steel and Size Requirement for Beam in Flexure

Abstract

For importance of concrete in building and constraction , This paper studies singly reinforced rectangular beam design produced of high strength concrete and compared with ordinary concrete with (doubly reinforcement ). For range of concrete strength (25-100) N/mm2 .The ultimate strength design method is used in the beam design . It is found that higher strength concrete requires 68.36% reduction in reinforcing steel compared with the lower strength concrete under the same load . also , for the higher strength concrete beams smaller size (222% for width and 79% for depth ) are necessary to resist the same bending moment. A major aim of this work is by using higher strength concrete in flexure, large space can be obtained ,as well as smaller member size. This would result in reduce gravity load to be transmitted to the foundations and economy in construction.