Characterizing the hysteretic response of extended endplate connections based on deformation mode classification

Abstract

Extended endplate connections (EEPCs) response ranges from full strength to partial strength. In the former, beam buckling is the primary deformation mode, while in the latter, a multitude of deformation modes can occur individually or simultaneously, including endplate bending, column flange bending, and column web-panel zone shear deformation. The deformation mode controls the connection's hysteretic response under cyclic drift demands, and particularly the magnitude of the pinching behavior. To that end, a data-driven study was conducted to first classify the primary deformation mode in EEPCs, out of six prescribed modes, given their geometric layout and material parameters. This is done using decision tree-based approaches that were trained using a large experimental/simulation dataset of more than 1200 data points. The new model constitutes a faster and more accurate alternative to existing analytical and mechanical models. Second, recommendations are provided for the numerical modeling of the connection hysteretic response as part of phenomenological deterioration models. Specifically, empirical values are provided for the pinching, stiffness degradation, and strength degradation parameters. The developed classification model and empirical hysteretic parameters aim to assist in achieving targeted designs and in conducting accurate system-level dynamic simulations.

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ORCID for A. Elkady: orcid.org/0000-0002-1214-6379

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