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During strong seismic events, inelastic shear deformation occurs in beam-column joints. Several researchers have provided different joint models to incorporate its inelastic properties in analytical modelling. However, these models require cumbersome calculations and tedious modelling techniques, which are time-consuming thus limit their practical application. To overcome these limitations, a new analytical model has been developed using a rotational spring and rigid links, which incorporates the inelastic shear deformation of the joint. The stiffness properties of the rotational spring element have been assigned in terms of a moment rotation curve developed from the joint shear stress-strain backbone curve. The inelastic joint rotation behaviour has been categorised in three stages viz. cracking, yielding and ultimate. The joint shear stress has been estimated using an analytical model based on the hybrid approach. The strain values corresponding to these damage satges have been evaluated based on the assessment of experimental data. Further, to account for the effect of adjoining beam and column on the joint rotation behavior, a geometry factor has been proposed to modify the stiffness properties of rotational spring. The response of the proposed analytical model has been validated at the component and structural levels. It has been observed that the proposed simplified beam-column joint model effectively emulates the inelastic behaviour of the joint in comparison to the existing models.
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PARATE et al. (2022) studied this question.