Data driven evaluation of existing numerical modelling guidelines for semi-rigid connections

Abstract

The performance-based earthquake engineering framework requires robust numerical models to accurately quantify structural performance under different hazards, beyond the scope of conventional building codes. Predicting the nonlinear behaviour of semi-rigid (SR) steel connections can be challenging given the multitude of deforming components and failure modes. The literature comprises a number of analytical and empirical models attempting to characterize their moment-rotation behaviour. These models are generally limited in terms of applicability. This paper focuses on flush end-plate (FEP) connections that are abundantly used in construction worldwide. A comprehensive experimental data pool of 374 specimens is assembled, digitalized and processed. This data pool is used to quantify the response parameters of FEP connections, including the elastic stiffness, moment capacity and rotational ductility. The data shows that bare steel FEP connections can develop an average strength of 30% that of the beam and a considerable plastic rotation of 4% radians. The robustness of the Eurocode 3 component method, in predicting the connection’s strength and stiffness, is also assessed. The analysis highlights the loss of accuracy for the component method particularly with respect to the elastic stiffness.

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

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