Simulation of Tests on Cast-In and Postinstalled Column-to-Foundation Connections to Quantify the Effect of Cyclic Loading
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Additional columns are often used as a retrofitting solution for reinforced concrete structures, particularly in seismic regions. These columns require postinstalled starter bars that inhibit the detailing of the anchorage with hooks. Often, the anchorage length of straight starter bars cannot be accommodated in foundations, which are generally short. For this reason, reductions of the large anchorage length, which are required according to the design codes, are desirable. The aim of the study presented in this paper was to quantify the adverse effect of cyclic loading on the capacity of connections with reduced starter bar anchorage lengths. To this end, finite-element analysis employing bond elements was realistically carried out to simulate seismic tests on column-to-foundation connections. The analysis allowed the study of the effect of cyclic loading on global performance and local behavior in terms of tensile and bond stresses along the starter bar. An equation to take into account the effect of cyclic loading was developed, which is the prerequisite to use a new design methodology on the basis of concrete anchor design provisions for seismic design cases.
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Acknowledgments
The experimental tests were conducted at the University of Canterbury (UC), Christchurch, New Zealand, together with Professor Pampanin, Dr. Akguzel and the team at the Structural Laboratory. Their support for the research project is greatly appreciated. The work presented in this paper was supported by the German Research Foundation (DFG) under Grant No. EL 72/18-1. Opinions, conclusions, and recommendations expressed in this paper are those of the authors and do not necessarily reflect those of the sponsors.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 18, 2014
Accepted: Mar 23, 2015
Published online: Jun 3, 2015
Discussion open until: Nov 3, 2015
Published in print: Jan 1, 2016
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