Improvement Of Seismic Capacity Of
External Beam-column Joints Using
Rectangular Spiral Shear Reinforcement
Author(s)
C. Karayannis, G. Sirkelis & P. Mavroeidis
Abstract
In this study the behavior of the external RC beam – column joints with
continuous rectangular spiral reinforcement as shear reinforcement in the joint
body is experimentally examined. The results of eight specimens are presented.
The specimens are sorted into two groups based on the size of the column. The
first group (Group A) comprises five specimens with a column cross-section
equal to 20/20 cm; one specimen without shear reinforcement in the joint body,
two with stirrups and two with rectangular spiral reinforcement as shear
reinforcement of the joint. The second group (Group B) comprises three
specimens; one without shear reinforcement in the joint body, one with one
stirrup in the joint body and one with rectangular spiral reinforcement in the joint
body. All specimens have suffered the same loading with increasing deformation
and two full cycles at every step. Maximum displacements of the beam's free
end in the loading cycles were ±6mm, ±20mm, ±40mm, ±60mm and ±80 mm
for the 1st, 2nd, 3rd, 4th and 5th loading step, respectively. The results from the
specimens reinforced with rectangular spiral reinforcement are compared with
the results from the specimens reinforced with stirrups, in terms of maximum
loading and energy absorption per step, and ductility capacity. From the
observed responses of the tested specimens it can be deduced that the use of
rectangular spiral reinforcement in the joint body significantly improved the
seismic capacity of the examined external beam-column connections.
Keywords: beam-column joints, spiral shear reinforcement.
Keywords
beam-column joints, spiral shear reinforcement.
Related Book
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