Experimental Evaluation of Posttensioned Precast Concrete Coupling Beams
Publication: Journal of Structural Engineering
Volume 136, Issue 9
Abstract
This paper describes the results from eight half-scale experiments of unbonded posttensioned precast concrete coupling beams under reversed-cyclic lateral loading. Each test specimen includes a coupling beam and the adjacent concrete wall pier regions at a floor level. Under lateral loads, the nonlinear displacements of unbonded posttensioned coupling beams are governed by the opening of gaps at the beam-to-wall joints. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation. The test parameters include the beam posttensioning tendon area and initial stress, initial beam concrete axial stress, angle strength, and beam depth. The results demonstrate the lateral stiffness, strength, and ductility of the coupling beams under cyclic loading, with considerable energy dissipation concentrated in the angles. It is shown that the residual displacements of the structure upon unloading are small due to the restoring effect of the posttensioning force. The sustained chord rotation capacities of the test specimens are compared with those from previous tests of monolithic coupling beams.
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Acknowledgments
This research was funded by the National Science Foundation (NSF) under Grant No. NSFNSF/CMS 04-09114 and by a Precast/Prestressed Concrete Institute (PCI) Daniel P. Jenny Fellowship. The support of the NSF Program Director Dr. P.N. Balaguru and members of the PCI Research and Development Committee is gratefully acknowledged. The writers also acknowledge the technical support by Cary Kopczynski of Cary Kopczynski and Company, Inc. In addition, the following companies have provided material donations and assistance to the project, and this support is gratefully acknowledged: StresCore Inc., Precision SURE-LOCK, and Dywidag-Systems International. The findings and conclusions in the paper are those of the writers and do not necessarily reflect the views of the organizations and individuals acknowledged above.
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Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 9 • September 2010
Pages: 1066 - 1077
Copyright
© 2010 ASCE.
History
Received: Aug 5, 2009
Accepted: Feb 21, 2010
Published online: Feb 26, 2010
Published in print: Sep 2010
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