Assessment and Design Procedure for the Seismic Retrofit of Reinforced Concrete Beam-Column Joints using FRP Composite Materials
Publication: Journal of Composites for Construction
Volume 16, Issue 1
Abstract
In this study, an analytical procedure for the evaluation of the expected performance of existing reinforced concrete (RC) beam-column joints before and after being retrofitted using fiber-reinforced polymer (FRP) composite materials is presented. Focus is given on the evaluation of the shear-strength versus deformation properties of the panel zone region either in the as-built or FRP-retrofitted configuration. Based on experimental and numerical evidence as well as on physical models representing the mechanics of the joint region, principal tensile stresses versus joint shear deformation relationships are adopted and preferred to more traditional nominal shear-strength rules, to evaluate, within a step-by-step iterative procedure, the combination of the joint shear contribution provided by the FRP composite material and that provided by the concrete core alone. The use of principal stresses allows one to directly account for the effects of variation of axial load, typically neglected in the assessment and retrofit of beam-column joints. The hierarchy of strength and sequence of events (damage mechanisms) expected within a beam-column subsystem are visualized via interaction performance domains, used as a basis for a performance-based retrofit philosophy. Specific limit states or design objectives are targeted, with attention given to both strength and deformation limits. The proposed analytical procedure is validated on the results of a set of experimental tests available in the literature. With the intention to provide a simple design tool that can be easily implemented by practicing engineers, a worked example for the evaluation of the expected performance of an FRP retrofitted beam-column joint is provided and used as a basis for a parametric study to illustrate the effects of different strengthening schemes on the behavior of strengthened exterior joint panels under various axial load levels.
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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 New Zealand Multi-Storey Buildings” is gratefully acknowledged. The assistance and cooperation of A. Vecchietti and R. Nassi in the early stages of this research are also acknowledged.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 1 • February 2012
Pages: 21 - 34
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Nov 29, 2010
Accepted: Jul 8, 2011
Published in print: Feb 1, 2012
Published online: Apr 27, 2012
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