Concrete Walls with Cutout Openings Strengthened by FRP Confinement
Publication: Journal of Composites for Construction
Volume 21, Issue 3
Abstract
Redesigning buildings to improve their space efficiency and allow changes in use is often essential during their service lives to comply with shifts in living standards and functional demands. This may require the introduction of new openings in elements such as beams, walls, and slabs, which inevitably reduces their structural performance and hence requires repair or strengthening. However, there are uncertainties regarding both the effects of openings and the best remedial options for them. Here, the authors report on an experimental investigation of the effectiveness of fiber-reinforced polymer (FRP)–based strengthening for restoring the axial capacity of a solid RC wall after cutting openings. Nine half-scale specimens, designed to represent typical wall panels in residential buildings with and without door-type openings, were tested to failure. It was found that FRP-confinement and mechanical anchorages increased the axial capacity of walls with small and large openings (which had 25 and 50% reductions in cross-sectional area, respectively) by 34–50% and 13–27%, to 85–94.8% and 56.5–63.4% of their precutting capacity, respectively.
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Acknowledgments
The authors would like to acknowledge the Research Council of Norway (RFF), Development Fund of the Swedish Construction Industry (SBUF), and Skanska for financing the work in this project. Special thanks are due to the technicians of CompLab, the structural engineering laboratory at Luleå University of Technology (LTU). The authors would also like to express gratitude to others who provided help during this research program, including Dr. Dan Diaconu from Politehnica University Timisoara, for helping with the strengthening work; and Ph.D. students Cristian Sabau and Niklas Bagge (both from LTU), for providing help with optical measurements and fruitful discussions, respectively.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 3 • June 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Jun 6, 2016
Accepted: Aug 11, 2016
Published online: Oct 20, 2016
Discussion open until: Mar 20, 2017
Published in print: Jun 1, 2017
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