An Unstiffened Eight-Bolt Extended End-Plate Moment Connection for Special and Intermediate Moment Frames
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VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 145, Issue 7
Abstract
Bolted extended end-plate (BEEP) moment-resisting connections are prequalified for use in special and intermediate moment frames. The current limits of this prequalification dictate that rolled wide-flange sections with a depth greater than 601 mm (24 in.) necessitate the use of the stiffened eight-bolt extended end-plate connection. The study reported herein experimentally evaluates an unstiffened eight-bolt extended end-plate connection for seismic applications. The connection features a modified bolt arrangement designed to promote uniform distribution of forces across the bolt group. Plastic hinging of the beam is relocated away from the connection joint by heat-treating selected regions of the beam flanges to reduce the strength of steel. Finally, the beam web is reinforced in the expected plastic hinge region to delay strength degradation due to local buckling. The pilot test specimen exceeded the qualifying 4% interstory drift angle. Failure occurred from buckling-induced fracture in the plastic hinge during loading cycles at 6% interstory drift. In this article, details of experimental development and test results are presented and the connection performance is further analyzed through posttest finite-element simulations.
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Acknowledgments
Funding for this research was provided by the National Science Foundation under the Network for Earthquake Engineering Simulation (NSF Grant No. 0936547). However, any opinions presented in this paper are solely those of the authors. The authors gratefully acknowledge the assistance provided by the staff of the Constructed Facilities Laboratory at North Carolina State University. The assistance of Gene Mitchell of GWY Inc. with developing turn-of-nut procedures is gratefully acknowledged, as is the advice from Dr. Tom Murray of Virginia Polytechnic Institute and State University.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 16, 2018
Accepted: Nov 14, 2018
Published online: Apr 29, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 29, 2019
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