Seismic Performance of Exposed Column–Base Plate Connections with Ductile Anchor Rods
Publication: Journal of Structural Engineering
Volume 148, Issue 5
Abstract
This paper presents full-scale experiments and computational analyses on exposed column–base plate connections with ductile anchors. The aim is to examine the seismic performance of these connections for their prospective use as weak bases, wherein steel moment frames are designed to concentrate inelastic rotations in the base connections rather than in the connected columns. The connections feature upset thread anchor rods in which the threads are milled to a smooth shank, providing a designated stretch length over which inelastic deformations may be concentrated. The shank is frictionally isolated from the footing using polyethylene tape. The four full-scale experiments investigate the effects of axial force, rod diameter, and rod material grade. The test specimens withstand (without anchor rod failure) the application of two Applied Technology Council–the Joint Venture partners of the Structural Engineers Association of California, the Applied Technology Council, and the Consortium of Universities for Research in Earthquake Engineering (ATC-SAC) protocols applied consecutively (each to drift amplitudes of 5%), followed by additional cycles to 6.5% drift amplitude. Complementary line element–based and continuum finite-element simulations are conducted to examine to what extent the experimentally observed response may be generalized to untested configurations. Implications for design are summarized, along with the limitations of the study.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are grateful to the American Institute of Steel Construction and the Charles Pankow Foundation for providing major funding for this project. Supplementary funding was provided by the Pacific Earthquake Engineering Research Center. The authors thank the advisory committee of the project: Mason Walters, Geoff Bomba and Ali Roufegarinejad of Forell/Elsesser Engineers, Jim Malley of Degenkolb Engineers, Chia-Ming Uang of UC San Diego, Subhash Goel of the University of Michigan, Tom Sabol of Engelkirk Structural Engineers, Tim Fraser of Structural Steel Detailing, Tom Kuznick of Herrick Steel, Joe Zona of Simpson Gumpertz and Heger, and Devin Huber of AISC. Financial support from China Scholarship Council (CSC, under Grant No. 201608330227) and University College London (UCL) through a joint research scholarship is also gratefully acknowledged by the second author.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 18, 2021
Accepted: Nov 11, 2021
Published online: Feb 17, 2022
Published in print: May 1, 2022
Discussion open until: Jul 17, 2022
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- Mohamed A. Shaheen, Konstantinos Daniel Tsavdaridis, Felipe Piana Vendramell Ferreira, Lee S. Cunningham, Rotational capacity of exposed base plate connections with various configurations of anchor rod sleeves, Journal of Constructional Steel Research, 10.1016/j.jcsr.2022.107754, 201, (107754), (2023).