SEISMIC PERFORMANCE OF DUCTILE AND NON-DUCTILE DETAILED BEAM-COLUMN SUB-ASSEMBLAGES

A.Kanchana Devi, Saptarshi Sasmal, K.Ramanjaneyulu

Abstract: Reinforced concrete(RC) framed joints are the crucial components as they are subjected to huge shear demandnearly 4-6 times larger than the adjoining members under earthquake. Hence, seismic performance of beam-column joints is evaluated for two scenarios viz.,i) beam column joints designed for seismic force but not provided with ductility detailing (non- ductile specimen) ii) designed for seismic force and provided with ductility detailing according to code of practice. An exterior joint of a typical three storied three bay RC Framed building is considered for the study. The frame is designed considering all the combinations of loads specified in code of practice. The performance of the beam-column sub-assemblage is evaluated in terms of performance parameters, namely,load- displacement hysteresis, energy dissipation, strength and stiffness degradation. Even though the nonductile specimen has slightly higher beam reinforcement than the ductile specimen, the ductile specimen carried higher load than the non-ductile specimen in the view of detailing in joint region. This may be due to the confinement effect provided by the stirrups in the joint region in the view of closer spacing as per ductile detailing. The maximum load carried by ductile detailed specimen in the positive and negative cycles is 39% and 9% higher than that of non-ductile specimen. This signifies the importance of ductility detailing.

Keywords: Beam column sub-assemblage, seismic performance, ductility detailing, Energy dissipation, strength degradation

DOI: https://doi.org/10.15623/ijret.2015.0425030