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Structural Engineering and Mechanics Volume 89, Number 1, January10 2024 , pages 077-91 DOI: https://doi.org/10.12989/sem.2024.89.1.077 |
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Simplified beam-column joint model for reinforced concrete moment resisting frames |
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Kanak Parate, Onkar Kumbhar and Ratnesh Kumar
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| Abstract | ||
| During strong seismic events, inelastic shear deformation occurs in beam-column joints. To capture inelastic shear deformation, an analytical model for beam-column joint in reinforced concrete (RC) frame structures has been proposed in this study. The proposed model has been developed using a rotational spring and rigid links. The stiffness properties of the rotational spring element have been assigned in terms of a moment rotation curve developed from the shear stress-strain backbone curve. The inelastic rotation behavior of joint has been categorized in three stages viz. cracking, yielding and ultimate. The joint shear stress and strain values at these stages have been estimated using analytical models and experimental database respectively. The stiffness properties of joint rotational spring have been modified by incorporating a geometry factor based on dimensions of adjoining beam and column members. The hysteretic response of the joint rotational spring has been defined by a pivot hysteresis model. The response of the proposed analytical model has been verified initially at the component level and later at the structural level with the two actually tested RC frame structures. The proposed joint model effectively emulates the inelastic behavior precisely with the experimental results at component as well as at structural levels. | ||
| Key Words | ||
| beam-column joint; hysteresis modeling; pivot model; rotational spring; shear strain; shear stress | ||
| Address | ||
| Kanak Parate: Department of Posts, Mumbai, India Onkar Kumbhar: Walter P Moore, Pune, India Ratnesh Kumar: Department of Applied Mechanics, Visvesvaraya National Institute of Technology, Nagpur, India | ||