Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Numerical Evaluation of Rigid Connection Using Weakened Fusable Splice Plates in Steel Moment Frames Under Cyclic Loading

Document Type : Original Article

Authors
Payam Tarighi 1
Mohammad Ali Kafi 2
1 Assistant professor, Department of Civil Engineering, Faculty of Technology and Engineering, Ahlul Bayt International University, Tehran, Iran.
2 Associate Professor, Faculty of Civil Engineering, Semnan University,, Semnan, Iran
10.22065/jsce.2024.480586.3531
Abstract
After the Northridge earthquake, connections called pre-qualified rigid connections by international codes were introduced. After ensuring the seismic performance of this type of connections in earthquakes, this concern was raised that due to the forming of plastic hinges in the beam elements, the repairability of the structure after the occurrence of moderate and severe earthquakes is not possible, or with excessive costs. Therefore, connections called replaceable connections were proposed; in which by forming plastic hinges in predetermined elements and replacing them after an earthquake, the structure will be able to be used again. In this study, a numerical investigation of the performance of a rigid connection with replaceability under cyclic loading has been done. In the following, the effects of some restrictions, including the maximum ratio of the width to the thickness of the flange of the beam, the lack of continuity or doubler plates of the column, on the performance of the proposed connection has been evaluated. The results have shown that in the proposed connection, the plastic hinge is formed in the fuse elements, and the beam and column remain in elastic state, and the connection is replaceable. Also, due to the early buckling of the fuse plates of the beam flange, the bending capacity of the connection has been reduced by 14% compared to the bending capacity of the fuse. Investigations have shown that the lack of simultaneous continuity and doubler plates of the column in the proposed connection has led to a decrease in energy absorption and bending capacity of the connection by 32.71% and 23.56%, respectively. Also, in this connection, in order to ensure its replaceability, the maximum ratio of the width to the thickness of the flange of the beam was limited to 80% and 33% of the limit determined by the provisions, respectively.
Keywords
Rigid connection
replaceable connection
Repairable connection
Continuity plates
Doubler plate

Subjects

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  • Receive Date 02 October 2024
  • Revise Date 02 December 2024
  • Accept Date 04 December 2024