Cyclic Response of Sloped Steel Moment Connections
Publication: Journal of Structural Engineering
Volume 145, Issue 7
Abstract
For seismic applications in special and intermediate steel moment frames, the design standard provides a number of prequalified connections. This assumes that the beam frames orthogonally into the column in the elevation and plan of the frame. To provide insight into the sloping effect, two one-sided, full-scale reduced beam section (RBS) moment connection specimens with a 25° slope angle were tested. The specimens had a beam connected to a column. The RBS dimensions were identical for both specimens, except that the RBS configuration was oriented parallel to the column centerline in one specimen and orthogonal to the beam span in the other. One orthogonal connection specimen was also tested. Defining the heel location as that where the outer face of the beam flange and column flange form an acute angle, testing showed that force concentration there caused brittle fracture. Fracture started from the end of the beam web complete joint penetration weld and the weld access hole. Design recommendations are made based on results from both testing and the associated finite-element simulation. A remedy that aims to reduce force concentration is also recommended.
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Acknowledgments
This project was sponsored by the American Institute of Steel Construction (AISC); Mr. Tom Schlafly served as the project manager. Mr. Steven Ball at John A. Martin & Associates, Inc. provided comment on the design of the test specimens. Schuff Steel Company donated the test specimens. AMEC Foster Wheeler in San Diego provided inspection services.
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©2019 American Society of Civil Engineers.
History
Received: Apr 19, 2018
Accepted: Nov 16, 2018
Published online: Apr 30, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 30, 2019
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