Flexural response of external R.C. beam-column joints externally strengthened with steel cages

摘要: Abstract An experimental and theoretical research referred to the flexural behavior of external R.C. joints strengthened with steel cages constituted by angles battens is presented. The subassemblage (beam, column joint) was subjected a constant vertical load acting on monotonically increasing lateral force applied at tip beam. control specimen without strengthening system it designed weak strong beam overstrength in joint region. Strengthening cases here studied refer caging both column. Cyclic response term load–displacement curves, crack patterns observation failure mode types were main results results. Results highlight effectiveness as system, which increases strength allows one move from A simplified analytical model proposed that can be used for pushover analysis able reproduce beam–column under monotonic loading. includes shear-to-moment interaction beams columns confinement effects induced cages. based determination elastic–plastic columns, latter being obtained knowledge ultimate moment associated design axial deduced through moment–axial domain. modeled strut tie concrete crushing yielding stirrups are only limit states considered. Finally, comparison between load–deflection curves prediction made showing good agreement.