Effects of Variation of Axial Load and Bidirectional Loading on Seismic Performance of GFRP Retrofitted Reinforced Concrete Exterior Beam-Column Joints
Publication: Journal of Composites for Construction
Volume 14, Issue 1
Abstract
Most of the experimental studies available in literature on the seismic assessment and retrofit of existing, poorly detailed, reinforced concrete (RC) beam-column joints, typical of pre-1970s construction practice, have concentrated on the two-dimensional (2D) response, using unidirectional cyclic loading testing protocol and constant axial load. Even more limited information is available on the performance of exterior (corner) three-dimensional (3D) RC beam-column joints with substandard detailing subjected to bidirectional loading regime. In this study, the results of a comprehensive experimental program is presented, aiming to show the effects of varying axial and bidirectional loading on the seismic performance of deficient exterior RC beam-column joints before and after retrofit. Ten exterior beam-column joint subassemblies are tested, including four as-built specimens and six retrofitted specimens using externally bonded glass fiber-reinforced polymer (GFRP) sheets. Test results are herein presented and conclusions are drawn on the basis of the observed global and local performance. The significance of the triaxial interaction of varying axial and bidirectional loading effects on the response of retrofitted corner joints is confirmed by the experimental findings. The proposed retrofit solution was shown to be capable of re-establishing an appropriate hierarchy of strength within the subassembly, protecting the panel zone region from shear failure while promoting the formation of a plastic hinge in the beam.
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Acknowledgments
The financial support provided by the NZ Foundation for Research, Science and Technology (FRST) through the Research Program “Retrofit Solutions for NZ” is gratefully acknowledged. The material support and technical assistance provided by Sika-NZ and BBR-Contech are also kindly appreciated.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 1 • February 2010
Pages: 94 - 104
Copyright
© 2010 ASCE.
History
Received: Jun 24, 2008
Accepted: Jul 28, 2009
Published online: Jan 15, 2010
Published in print: Feb 2010
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