Comparative Study on Structural Behavior of Reinforced Concrete Straight Beam and Beams with out of Plane Parts

This paper aims to experimentally investigate and compare the structural behavior of reinforced concrete straight beam and other beams there made with one, two, and three out of plane parts. The study focused on the effect of the number and location of the out plane parts on the beams mid span deflection, and rotation, as well as the ductility index, cracking loads, and failure modes. Four beams were manufactured with a cross-sectional width of ۱۵۰ mm and a depth of ۲۰۰ mm, and ۲۰۰۰ mm in length. All the beams were made with normal strength concrete and constant longitudinal reinforcement ratio ۰.۰۱۱ for negative and positive moment. All the beam specimens were clamped by a special steel fixed ends and subjected to the two-point load up to their failure. The obtained results presented that the load bearing capacity of straight beam was higher than the beams with out of plane parts. Furthermore, the beam with two out of plane parts has capacity higher than the beams with one and three out of plane part by ۵.۸۶%, and ۵۵.۰۷%. In addition, the results showed that the ductility increased with increasing number of out of plane parts by ۵.۵۲%, and ۳۲.۷۱% as copared with the beam with one out of plane part.

Keywords:

Ductility index , cracking loads , Failure modes