FLEXURAL BEHAVIOR OF OVER REINFORCED HELICALLY CONFINED CONCRETE BEAMS

Structural Eng., AL Azhar University, Qena, Egypt

Over reinforced concrete sections are brittle, and fail suddenly without warning, so it is

restricted in codes of practice of concrete design. In some cases such as high rise building and

bridges, it is useful to use a high percentage of steel reinforcement in concrete sections (over

reinforced concrete sections) to reduce the beam size and provide adequate stiffness. Brittle

compression failure could be prevented by using proper confinement in the compression zone,

which restrains the lateral expansion, and leads to enhancement in the strength and ductility of

concrete. This paper presented an analytical study based on section analysis of the behavior

of over reinforced concrete beams confined with helical reinforcement. The analytical study is

implemented by introducing a computer program. It take into consideration the nonlinear

properties of concrete and reinforcing steel. The results is verified by comparing it with

existing experimental results published in the literature.