Nonlinear Modeling of RC Substandard Beam-Column Joints for Building Response Analysis in Support of Seismic Risk Assessment and Loss Estimation

Naveed Ahmad; Muhammad Rizwan; Babar Ilyas; Seda Hussain; Muhammad Usman Khan; Hamna Shakeel; Muhammad Ejaz Ahmad

doi:10.20944/preprints202210.0017.v1

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preprints.org > engineering > civil engineering > doi: 10.20944/preprints202210.0017.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Nonlinear Modeling of RC Substandard Beam-Column Joints for Building Response Analysis in Support of Seismic Risk Assessment and Loss Estimation

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Version 1 : Received: 2 October 2022 / Approved: 4 October 2022 / Online: 4 October 2022 (10:38:02 CEST)

A peer-reviewed article of this Preprint also exists.

Ahmad, N.; Rizwan, M.; Ilyas, B.; Hussain, S.; Khan, M.U.; Shakeel, H.; Ahmad, M.E. Nonlinear Modeling of RC Substandard Beam–Column Joints for Building Response Analysis in Support of Seismic Risk Assessment and Loss Estimation. Buildings 2022, 12, 1758. Ahmad, N.; Rizwan, M.; Ilyas, B.; Hussain, S.; Khan, M.U.; Shakeel, H.; Ahmad, M.E. Nonlinear Modeling of RC Substandard Beam–Column Joints for Building Response Analysis in Support of Seismic Risk Assessment and Loss Estimation. Buildings 2022, 12, 1758.

Abstract

The paper discusses how joint damage and deterioration affect the seismic response of existing reinforced concrete frames with sub-standard beam-column joints. The available simplified modeling techniques are critically reviewed to propose a robust, yet computationally efficient technique for simulating the nonlinear behavior of substandard beam-column joints. Improvements over the existing models include simulation of the cyclic deterioration of joint stiffness and strength as well as pinching in the hysteretic response, implemented considering a deteriorating hysteretic rule. A fibre-section forced-based inelastic beam-column element is developed; considering improved material models and fixed-end rotation due to bond failure, rebars-slip and inelastic extension, to simulate the deteriorating cyclic behavior of existing pre-cracked beam-column members. For the assessment of frames with substandard exterior beam-column joints, a nonlinear model for the exterior joint is developed and validated through a full-scale quasi-static cyclic test performed on a substandard T-joint connection. The proposed model allows considering structural performance in risk assessment while accounting for true inelastic mechanisms at the joints.

Keywords

beam-column joint; fibre-based section modeling; joint shear hinge; substandard beam-column joints; stiffness and strength deterioration; reinforced concrete; seismic vulnerability; risk

Subject

Engineering, Civil Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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