Cyclic Behavior of FRP Strengthened Beam-Column Joints under Various Concrete Damage Levels

This paper is intended to examine the efficiency of utilizing FRP composite material with an externally bonded technique in enhancing behavior damaged B-C joints and controlling their failure mode using NLFEA approach. At first, modeled Beam-Column joint was validated as per previously-attained experimentally-attained results. Later, model widened experiment impact axial-column load concrete compressive strength on reinforced un-reinforced models FRP. To run experiment, there were three cases applying axial column load: no applied (0%), 25%, 50%, 75%, while degradation level (0% damage), (25% (50% damage). All evaluated for structural performance, considering: mode, stresses distribution, ultimate capacities pulling pushing its corresponding displacements. However, horizontal load-displacement hysteretic loops envelopes, stiffness degradation, displacement ductility, energy dissipation reported. The experimental results revealed that externally-reinforce improved overall cyclic caused a rise capacity, displacement, ductility dissipation, it slowed down degradation. In addition, converted region between from brittle ductile due formation plastic hinge only side beam when exceeded 25%. It must be noticed column’s less than capacity resultant deflection solely improved. has been stated increasing loading by 25% increases resulting 3% undamaged joints, which further 16% each increased damage level. contrast, absorbed 170% under loading, reduced one-fourth various levels. Generally, observations help specialized engineers retrofit appropriate already-standing buildings accuracy.