Finite-Element Simulation of Posttensioned Steel Connections with Bolted Angles under Cyclic Loading
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Steel beam-column connections with posttensioned (PT) elements are proven systems that can provide adequate stiffness, strength, and ductility, while eliminating permanent deformations in a moment-resisting frame subjected to seismic loading. In this study, detailed three-dimensional finite-element (FE) models of steel beam-column connections with PT strands are developed and analyzed under cyclic loading. Efforts are made to overcome challenges in performing the nonlinear FE analysis of large-scale PT connections, which involves gap opening and closing behavior as well as contact and sliding phenomena. Geometric and material nonlinearities, preloaded bolts and strands are also considered in the modeling. Through a verification study, the results from the FE models are validated against prior experiments on interior PT connections with top-and-seat angles. Parametric studies are also conducted to investigate the effects of three factors on the cyclic performance of PT connections. The factors investigated in this study are: the presence of beam flange reinforcing plates, the yield strength and strain hardening of steel angles, and the amount of initial posttensioning force in the strands.
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Acknowledgments
The financial contribution of Natural Sciences and Engineering Research Council of Canada (NSERC) through Discovery Grant was critical to conduct this research and is gratefully acknowledged. We would also like to acknowledge CMC Microsystems for the provision of products and services that facilitated this research, including ANSYS Multiphysics.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
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© 2015 American Society of Civil Engineers.
History
Received: Jul 30, 2014
Accepted: Apr 2, 2015
Published online: Jun 8, 2015
Discussion open until: Nov 8, 2015
Published in print: Jan 1, 2016
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