Numerical investigation of new steel connection using short stub column
Farzad Hatami
1
(
Structural & Earthquake Research Institute, Amirkabir University of Technology, Tehran, IRAN
)
mehrdad taheripour
2
(
Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
)
Reza Raoufi
3
(
Civil Eng. Department, Ahwaz Branch Islamic Azad University
)
Keywords: ductility, Finite elements, Steel connection, stub, plastic strain,
Abstract :
Little evidence of the formation of plastic zones is seen in damaged structures in various earthquakes. Most of the conducted studies have focused on creating a plastic hinge in a part of the beam making irreparable damage to the beam. If the plastic joint in the beam does not occur, a force will be created which is more than the plastic moment of the beam to be transferred to the connection and the column. This will either cause the brittle failure of the connection or damage to the panel zone of the column. Therefore, in this research, four connections with new geometry have been proposed aimed at reducing damage in beams and columns and the possibility of replacing damaged parts. In general, the proposed connections are suggested by replacing an H or I-shaped section with a companion, or instead of an end-plate, as a short stub column. In this study, first, a finite element model of the end-plate connection, which is a combination of welding and screwing, subjected to cyclic loading, was selected. Then, after the validation of Abaqus software, a study was carried out on the proposed connections. The results show that the stable region, with its nonlinear behavior, creates a controlled limited joint with extraordinary ductility. Yielding in the stub causes its fusion behavior and prevents damage to beams and columns It also significantly reduces the plastic stress and strain in the panel zone of the column.
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