Methodology and Application of Ductile Damage Modeling on Double Tee and Extended Endplate Connections
Publication: Practice Periodical on Structural Design and Construction
Volume 28, Issue 2
Abstract
The postyield ductile damage of steel structures is gaining the interest of researchers and designers alike. The ability to model and quantify the damage of structural steel is the focus of this research and a novel approach that relies on micromechanical theories is presented to develop the finite element (FE) model for the ductile damage of double Tee and extended endplate connections. First, a methodology is presented to guide researchers and designers on how to model the FE fracture of steel material subjected to combined tensile and shear loadings using two built-in ductile damage models in ABAQUS [the Stress Modified Critical Strain (SMCS) and the Hooputra models]. Second, several steel base materials (A992, A572-50, and A36) and bolt materials (A325 and A490) are calibrated for use in both ductile damage models (SMCS and Hooputra). Third, FE fracture models are developed and validated against experimental results, available in the literature, of double Tee and extended endplate connections subjected to monotonic and cyclic loadings. The results show that the proposed FE fracture model predicts the failure mode and load-displacement response of double Tees and extended endplates with at most 9.5% deviation for the displacement at fracture and 7.8% deviation for the ultimate load. The FE fracture model predicts the postultimate strength and ductility required for seismic applications. Also, the FE fracture model predicts crack initiation in base or bolt material due to tensile and/or shear loadings. In a broader perspective, this research enables design engineers to accurately predict the postultimate behavior of steel connections with ease. The research also aims at including the fracture characteristics of steel material in the current design guidelines of steel connections.
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Data Availability Statement
Some data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Such data and models include: all ABAQUS models generated in this research.
Acknowledgments
The authors thank the National Council for Scientific Research in Lebanon and the American University of Beirut, CNRS-L/AUB, Ph.D. Award Program 2017–2018.
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Published In
Practice Periodical on Structural Design and Construction
Volume 28 • Issue 2 • May 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 26, 2022
Accepted: Sep 30, 2022
Published online: Dec 20, 2022
Published in print: May 1, 2023
Discussion open until: May 20, 2023
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