Improvement of the structural behavior of hollow beam reinforced by both steel bars and fiber

The aim of the present experimental study is to examine the effect of steel fiber on the improvement of the structural behavior of hollow beams reinforced by both steel bars and fibers. This work is attempt to matching the both lightweight structural member with the structural ductility requirements. This is reached by combining the optimum beam's section topology with using steel fiber reinforcement. Therefore, different parameters are used to alter, named, shear span to depth ratio (a/d) and hollow shape. Three values for (a/d) used for investigating 8, 6, and 4. Two hollow type of circular and square shape are used. However, beam size, fiber type and longitudinal reinforcement ratio were left unchanged. All these parameters are compared with the control specimens of solid sections and hollow of normal concrete.