Shear Strength of Reinforced Concrete Beam-Column Joint under Cyclic Loading
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Date
2018-04
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Journal Title
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Publisher
AAU
Abstract
A beam-column joint is a critical region which contribute to the integrity of the structure and
that transfer forces from one structural element to another. A beam- column joint need proper
design and detailing to achieve adequate performance of reinforced concrete frame or else it
causes large story drift and structural damage. Among the most common failure modes in
beam-column joints, a shear-type of failure is the most sensitive to cause structural failure.
When the joint is subjected to cyclic loading its shear strength will be affected by many factors
such as concrete strength, column axial load, joint aspect ratio, transverse reinforcement and
lateral beams. Predicting the joint shear behavior is difficult because of the combined effect of
those different factors. Among those different factors, most researchers have different
conclusion on the effect of column axial load on the joint shear strength, especially when the
joint is designed and detailed according to capacity design philosophy. Therefore, this study
mainly focused on the effect of column axial load on the shear strength of an exterior beam
column joint; which is detailed according to capacity design philosophy.
The effect of column axial load was studied through finite element software when the end of
the beam was subjected to cyclic loading. The numerical study was performed through
ABAQUS and the joint was examined with different magnitude of column axial loads and their
effect on the shear strength of the joint was evaluated. The results obtained from the analysis
showed that the column axial load up to 0.2f
c
′
× A
g
provided confinement to the joint and
enhanced the joint shear strength. On the other hand column axial load beyond 0.2f
M.Sc. Thesis Page II
c
′
× A
g
exhibited degradation of joint shear strength. This might be attributed to concrete, crushed in
the joint region.
Description
Keywords
Cyclic Loading, Shear Strength, Beam-Column, Joint