Abstract
In this study, the structural behavior and performance of the dapped end beams with composite section under effect of static and repeated loads was investigated by experimentally tested and included ten simply supported beams with dapped in one of ends. The parameters that have been taken into consideration represented by studying the effect of reparation longitudinal tensile reinforcement by steel sections, effect of repeated loads, different types of composite steel sections, and influence of increased the shear span to depth ratio (a/d) more than one on the composite dapped end region. The study focused on determining the first cracking load, ultimate strength (Pu), deflection at service and ultimate load, failure mode, load-deflection behavior, ductility ratios, and crack pattern at failure load.
 The results presented that using the composite I-section instead of normal section in dapped end beams developed the shear capacity for dapped end region and enhanced the first crack appearances about 33.33, and 39.42 % for shear span to depth ratio 1.0, and 1.5 respectively.
Highlights
Beam is an important part of structures where was to carry the loads along it and transport loads to the supports
Wen et al study the effect of shear span-to-depth ratios (a/d) larger than one and showed that the dapped-end beams failed in flexure when the (a/d) increased so they suggested that dapped-end beams be designed using highstrength concrete with low ratio of flexural tensile reinforcement to ensure a ductile flexure failure
The tests showed the general behavior of simple supported beams with dapped end in one of ends, the results of tests beams as shown below according to the following parameters: 3.1 Effect of Shape Steel Section on the Composite Dapped End The compression between types of composite sections was investigation to determine the effect of changed the shape steel section on structural behavior of dapped end beams
Summary
Beam is an important part of structures where was to carry the loads along it and transport loads to the supports. For supported pre-cast concrete beam, when need to make large span the depth of beam must be increase to satisfy the strength for flexural in mid span and shear at the ends, but the larger depth of beam when site on the corbel or on inverted T-beam, the total depth will be very much. Mattock & Chan recommended that the nib of dapped end beams might designed similar to an inverted corbel, and the shear span measured from center of reaction force at support to the center of hunger reinforcement. Wen et al study the effect of shear span-to-depth ratios (a/d) larger than one and showed that the dapped-end beams failed in flexure when the (a/d) increased so they suggested that dapped-end beams be designed using highstrength concrete with low ratio of flexural tensile reinforcement to ensure a ductile flexure failure
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