تاثير سطح عملكرد قاب خمشي بتن مسلح ويژه بر رفتار غيرخطي - لرزه يي اتصالات تير - ستون مياني

THE EFFECT OF THE PERFORMANCE LEVEL OF SPECIAL REINFORCED CONCRETE FLEXURAL FRAMES ON THE SEISMIC-NONLINEAR BEHAVIOR OF INTERIOR BEAM-COLUMN JOINTS

The development of plastic hinges in reinforced con¬crete moment resisting frames (RC-MRF) is an impor¬tant key element to increase the deformational capac¬ity and energy dissipation ability, in order to maintain overall structural stability, while experiencing a severe earthquake. Numerous experimental and analytical re¬searches show the formation of plastic hinges in beams away from the column face increases the overall ductil¬ity of the structure, while the core of the beam-column joints should remain in an elastic state. The latter con¬dition is one of the requirements of many codes of prac¬tice. The main aim of this paper is to evaluate the behav¬ior of interior beam-column joints in special moment resisting frames, which have been designed according to standard 2800. the Iranian national building code Part9 and the Iranian concrete code (ABA). The be¬havior of such joints was numerically studied for differ¬ent performance levels of the overall structural behavior for more than 30 interior beam-column joints, utilizing the UANSYS" finite element program. The main im¬portant variables which influence joint behavior, such as: column axial force, bonding effect , amount of main reinforcements and stirrups, concrete strength and rein- \rv forcement strength, were considered during this evalua¬tion.