شبكة التخطيط العمراني بسم الله الرحمن الرحيم
للكاتبين
Hatem Ibrahim and Mamdouh Elbadry
Department of Civil Engineering, University of Calgary, Alberta, Canada
ABSTRACT
The Current ACI and CSA code provisions recommend large amount of shear reinforcement for reinforced
concrete beam-column joints in the form of closed hoops and cross ties to ensure confinement of the joint
concrete core. The closed hoops, in addition to the anchorage length of the beam bars, cause significant steel
congestion. In this research, double-headed studs are proposed as shear reinforcement in lieu of
conventional closed hoops and ties. Four full-scale beam-column joint specimens were tested under cyclic
loading. The first specimen was designed without shear reinforcement in the joint and used as sheardeficient
control specimen. The second specimen was designed according to the Canadian Code provisions
and the joint was reinforced with closed hoops and cross ties. The joints of the remaining two specimens
were reinforced with two different amounts of double-headed studs. The proposed detail of headed studs
proved to be a viable option for reinforcing exterior beam-column joints. In comparison with the shear
deficient-joint, the two specimens reinforced with double-headed studs exhibited considerable enhancement
in the behaviour, in terms of strength, ductility, energy dissipation, and joint contribution to the lateral drift.