Abstract
The understanding of the load-resistance mechanisms and failure modes of large-scale concrete and masonry structures relies on accurate measurements of surface motions and deformations, and faithful crack maps. Measurements are typically taken using surface-mounted point-wise sensors (PWSs), and crack maps are hand-drawn based on visual inspection. It is impractical to obtain detailed displacement and deformation maps that describe the complex response of large structures based on PWS measurements. In addition, manual crack drawing is difficult, time-consuming, and prone to human errors, which makes it challenging to consistently produce faithful crack maps. This paper reports on a pilot study to test the use of three-dimensional digital image correlation (3D-DIC) as a non-contacting method to measure surface deformation fields on full-scale masonry walls, and produce detailed crack maps. Three confined masonry walls were tested under horizontal in-plane reverse-cycle loads. The specimens were designed to attain different levels of strength and deformability through different load-resistance mechanisms. Representative 3D-DIC measurements of drift, diagonal deformations, and interface slip between the reinforced concrete tie columns and the masonry infill were evaluated vis-à-vis benchmark PWS measurements, showing a comparable accuracy. Strain maps based on 3D-DIC measurements were enlisted to visualize the development of the fundamental strut-and-tie resisting mechanism in confined masonry walls subjected to horizontal in-plane loads, and illustrate practical structural analysis and design implications. More detailed crack maps compared with traditional hand-drawn maps were obtained based on 3D-DIC maximum principal strain contours.
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Acknowledgments
This material is based upon work partially supported by the National Science Foundation under grant No. CMMI-1049483. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The support of the University of South Carolina (USC) through the second author’s research incentive funds, the South Carolina Center for Mechanics, Materials and Non-Destructive Evaluation, the Magellan Scholar Program, and Correlated Solutions, Inc. (Columbia, SC) which provided the software Vic-3D free of charge, is gratefully acknowledged. Special thanks are extended to the following individuals for their assistance in preparing and conducting the experiments: Mr. Bradford DiFranco (NSF-REU student), Dr. Enrico Garbin (formerly Postdoctoral Fellow), Mr. Siming Guo (PhD student), Mr. Stephen Jones (USC Magellan Scholar), Dr. Paolo Mazzoleni (formerly Visiting Research Associate), Mr. Micah Simonsen (Correlated Solutions, Inc.), and Prof. Emanuele Zappa (Politecnico di Milano).
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Ghorbani, R., Matta, F. & Sutton, M. Full-Field Deformation Measurement and Crack Mapping on Confined Masonry Walls Using Digital Image Correlation. Exp Mech 55, 227–243 (2015). https://doi.org/10.1007/s11340-014-9906-y
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DOI: https://doi.org/10.1007/s11340-014-9906-y