Effect of In-Plane Damage on Out-of-Plane Response of FRCM Strengthened Masonry Infilled RC Frames
Publication: Journal of Composites for Construction
Volume 26, Issue 6
Abstract
The out-of-plane (OP) strength of masonry infills is reduced when damaged under the action of the in-plane (IP) forces. A strengthening approach using a fabric-reinforced cementitious matrix (FRCM) was proposed for improving the OP strength of damaged infill walls. A finite-element (FE) model of a reinforced concrete (RC) frame, infilled with FRCM-strengthened masonry, was developed and validated using experimental results and analytical predictions. Interaction curves representing the interplay between in-plane damage and out-of-plane response were generated for unstrengthened (ordinary) and FRCM-strengthened infill walls using FE analysis. Results of the FE analysis showed that FRCM-strengthened infills had greater OP strength in the undamaged state and suffered less strength degradation at high-damage states compared to unstrengthened infills. Anchoring of the fabric proved effective in utilizing the strength and ductility of the FRCM reinforcement. The fabric with ±45° orientation contributed more in resisting the diagonal tension under in-plane shear but was not as effective as 0°–90° orientation in resisting the OP flexural stresses corresponding to in-plane damage at 2.2% drift level. A novel definition of damage state was introduced for fragility analysis that can consider the effect of in-plane damage and out-of-plane strength using interaction curves. A four-bay, five-story masonry infilled RC frame was analyzed using the capacity spectrum method, and fragility curves were developed for unstrengthened and FRCM-strengthened infills. The effect of variation in out-of-plane demand and in-plane damage on each floor was included in the analysis. The RC frame using FRCM strengthened infills exhibited a smaller probability of exceedance of the performance limit than the unstrengthened infills. The proposed methodology helped identify critical infills that require strengthening.
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Acknowledgments
The authors express their sincere appreciation for the careful reading of the manuscript and the insightful comments offered by the anonymous peer reviewers. The financial support from the Ministry of Education, Government of India, New Delhi is gratefully acknowledged. Additionally, the authors thank Dr. Vaibhav Singhal (Indian Institute of Technology Patna) for the valuable suggestions on the finite-element model and comments on this manuscript.
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Journal of Composites for Construction
Volume 26 • Issue 6 • December 2022
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© 2022 American Society of Civil Engineers.
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Received: Jan 30, 2021
Accepted: May 25, 2022
Published online: Sep 1, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 1, 2023
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