Effect of length of symmetrical cantilever edges on the absolute maximum bending moment in uniformly loaded simply supported reinforced concrete beams

Abstract EN

This paper is devoted to study the effect of length of symmetrical overhanging edges on the absolute maximum bending moment of uniformly loaded simply supported reinforced concrete beams.

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All calculations had been carried out done based on elastic analysis and the ultimate strength method of design as per ACI 318M-14 code requirements for flexural and deflection constraints.It is approved that the beam with optimallength of overhanging edge ( ) equal to 0.35 the beam length between supports ( ) has equal maximum positive bending moment and maximum negative bending moment and optimal absolute maximum bending moment compared with the same beam but with other lengths of overhanging edges.

Different beams cases had shown that the area of tension reinforcement may be increased up to 120% when the length of overhanging edge is away from the optimal length ofoverhanging edge of the same beam.

The convergence from the optimal length of overhanging edge may lead to good relative economy of the beam.