The Effect of Longitudinal Reinforcement End Anchorage Angle and Development Length from the support in Beam Capacity
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Date
2019-10
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Publisher
Addis Ababa University
Abstract
In reinforced concrete members, reinforcement must be bonded or anchored to the
concrete. Reinforcement development length is provided in the regions of maximum
stress to zero stress. However, at the support of simply supported beam, the bending
stress is zero, the researchers recommend that the longitudinal reinforcement should
develop farther from the support to resist pullout of bars. The research focuses on the
investigation of the effect of longitudinal reinforcement end anchorage angle and
development length from the support on simply supported beam capacity. The
investigation was conducted on three shear critical and three flexure critical beams using
experiment and finite element analysis software. The experimental and the finite element
analysis result gives comparable result for each beam. The result shows that the
development of a longitudinal reinforcement bar farther from the center of support and
use of 135
o
end anchorage angle has no significant effect on flexure critical beams
capacity and crack pattern formation. But, use of development length and different end
anchorage angles on longitudinal reinforcement bars have a significant effect on the
ultimate load capacity and crack pattern formation on the shear critical beams. The
ultimate capacities of beams having longitudinal reinforcement 135
o
or 90
end anchorage and
beams without development length from the support reduced by 11.75% and 29.05%
from the ultimate capacities of beams having 90
o
end anchorage respectively. Also, shear
critical beams give different crack pattern formation due to the variation of reinforcement
bar end anchorage angle and development length.
Description
Keywords
Beam Capacity, Longitudinal Reinforcement, Anchorage Angle