Abstract
This research aims to investigate experimentally the attitude and performance of hybrid reinforced concrete Dapped End Beams. The study consists of testing thirteen specimens, all of which have similar dimensions (1000 * 120 * 250 mm). Three specimens were considered as control specimens (non-hybrid concrete) and the other specimens were strengthened in (nib and D-region) by using two types of concrete (high-strength concrete, steel fiber reinforced concrete) and with construction joint. The experimental results showed that the presence of the construction joint in the reentrant corner of specimens with non-hybrid normal concrete and specimens with non-hybrid high strength concrete leads to a decrease in strength of about (33%) and (6%), respectively and does not lead to a decrease in strength in the concrete specimens reinforced with steel fibers. Also, the presence of the construction joint in the D- region in normal non-hybrid concrete specimens and non-hybrid high strength concrete specimens as well as non-hybrid steel reinforced concrete specimens leads to an increase in the strength of about (0.5%), (10%) and (1%), respectively.
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