Effect of Load Distribution on Shear Resistance of Haunched Beam: Experimental Study
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Date
2019-10
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Addis Ababa University
Abstract
Major parameters that have an influence on the shear strength of beams without shear
reinforcements identified by many researchers are shear span to depth ratio (a/d), tensile
strength of concrete (ft), longitudinal reinforcement ratio (ρ), size of beam and presence
of axial force. Effects of load distribution and tapered/variable depth of beam has not given
great concern in many studies as well as in building design codes. Results of experimental
tests on twelve shear critical beam specimens were presented to study whether the shear
strength of beam is affected by type of load distribution as well as tapered/variable depth.
The specimens are comprised of six types of beam namely the PC(prismatic beam
subjected to central concentrated), HUC(haunched up beam subjected to central
concentrated load), HDC(haunched down beam subjected to central concentrated load),
PU(prismatic beam subjected to two point load), HUU(haunched up beam subjected to
two point load) and HDU(haunched down beam subjected to two point load). Two types
of load distribution have been taken into consideration; the former three types of beams
are subjected to central concentrated load and the later three types of beam are subjected
to two-point loads. The varied/tapered shape under consideration is haunched beam. Two
types of haunched beams are studied; the haunched up beam and the haunched down beam.
Each type of beam is casted and tested twice for the perfection of the study. All specimens
have the same size h (200 mm), same shear span to depth ratio a/d (2.75) and reinforcement
ratio. The study showed that type of loading has significant effect on the shear resistance
of haunched beams. The type of haunches also has a significant effect on shear resistance.
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Keywords
Haunched Beam, Load Distribution, hear Resistance