Vol. 17, No. 3, pp. 273-282 (2021)
CAPACITY EVALUATION OF EIGHT BOLT EXTENDED ENDPLATE MOMENT
CONNECTIONS SUBJECTED TO COLUMN REMOVAL SCENARIO
Ehsan Ahmadi 1, 2 and Seied Ahmad Hosseini 3, *
1 Department of Civil Engineering, Islamic Azad University, Tehran, Iran
2 Beton Wall Co., Tehran, Iran
3 Faculty of Passive Defense, Malek Ashtar University of Technology, Iran
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 9 July 2020; Revised: 25 March 2021; Accepted: 30 March 2021
DOI:10.18057/IJASC.2021.17.3.6
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ABSTRACT
The extended stiffened endplate (8ES) connection is broadly used in the seismic load-resisting parts of steel structures. This connection is prequalified based on the AISC 358 standard, especially for seismic regions. To study this connection’s behaviors, in the event of accidental loss of a column, the finite element model results were verified against the available experimental data. A parametric study using the finite element method was then carried out to investigate these numerical models’ maximum capacity and effective parameters' effect on their maximum capacity in a column loss scenario. This parametric analysis demonstrated that these connections fail at the large displacement due to the catenary action mode at the rib stiffener's vicinity. The carrying capacity, PEEQ, Von-Mises stress, middle column force-displacement, critical bolt axial load, and the beam axial load curves were discussed. Finally, using the Least Square Method (LSM), a formula is presented to determine the displacement at the maximum capacity of these connections. This formula can be used in this study's presented method to determine the maximum load capacity of the 8ES connections in a column loss scenario.
KEYWORDS
Bolted endplate connection, Finite element analysis, Catenary action, Column loss scenario, Theoretical model
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