Multi-dimensional SAR tomography for monitoring the deformation of newly built concrete buildings
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AbstractDeformation often occurs in buildings at early ages, and the constant inspection of deformation is of significant importance to discover possible cracking and avoid wall failure. This paper exploits the multi-dimensional SAR tomography technique to monitor the deformation performances of two newly built buildings (B1 and B2) with a special focus on the effects of concrete creep and shrinkage. To separate the nonlinear thermal expansion from total deformations, the extended 4-D SAR technique is exploited. The thermal map estimated from 44 TerraSAR-X images demonstrates that the derived thermal amplitude is highly related to the building height due to the upward accumulative effect of thermal expansion. The linear deformation velocity map reveals that B1 is subject to settlement during the construction period, in addition, the creep and shrinkage of B1 lead to wall shortening that is a height-dependent movement in the downward direction, and the asymmetrical creep of B2 triggers wall deflection that is a height-dependent movement in the deflection direction. It is also validated that the extended 4-D SAR can rectify the bias of estimated wall shortening and wall deflection by 4-D SAR. (C) 2015 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS). Published by Elsevier B.V. All rights reserved.
All Author(s) ListMa PF, Lin H, Lan HX, Chen FL
Journal nameISPRS Journal of Photogrammetry and Remote Sensing
Volume Number106
Pages118 - 128
LanguagesEnglish-United Kingdom
KeywordsCreep and shrinkage; Multi-dimensional SAR tomography; Newly built concrete buildings; TerraSAR-X; Thermal expansion
Web of Science Subject CategoriesGeography, Physical; Geology; Geosciences, Multidisciplinary; Imaging Science & Photographic Technology; Physical Geography; Remote Sensing

Last updated on 2020-24-11 at 00:42