Shake Table Tests on Suspended Nonstructural Components Anchored in Cyclically Cracked Concrete
Publication: Journal of Structural Engineering
Volume 140, Issue 11
Abstract
Insufficient anchorage of nonstructural components is a substantial cause of earthquake damage. To investigate this issue, shake table tests were conducted on model nonstructural components suspended and supported via anchors cast in cyclically cracked concrete. Concrete slabs supporting the anchored model component were subjected to seismic floor accelerations and corresponding floor-level cyclic crack width histories to simulate the anchor boundary conditions found in concrete structures during an earthquake. For these tests, post-installed anchors, namely, undercut and expansion types, were tested at various seismic demand levels. This paper presents this unique test data and illustrates important seismic anchor performance characteristics. For the investigated case, the measured correlation between anchor load and crack width indicated a low average anchor load level. In addition, the cumulative anchor displacements and achieved ultimate load capacities showed conservatism when compared with results of simulated seismic tests on isolated anchors.
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Acknowledgments
The study presented in this paper was partially funded by the Hilti Corporation. The German Academic Exchange Service (DAAD) provided additional support for the lead author. In addition to the authors, project team members include Profs. Robert Dowell and Jan Hofmann and (former) graduate students Drs. Derrick Watkins and Richard Wood. Oversight committee members include Dr. Matthew Hoehler, Dr. Ulrich Bourgund, Mr. Rainer Hüttenberger, Mr. John Silva of Hilti, and Dean Frieder Seible of UCSD. The assistance of the Charles Lee Powell Laboratory staff during testing, in particular Mr. Paul Greco and Mr. Andy Gundthardt, as well as undergraduate students is greatly appreciated. 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 140 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 16, 2012
Accepted: Oct 24, 2013
Published online: May 19, 2014
Discussion open until: Oct 19, 2014
Published in print: Nov 1, 2014
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