Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System
AbstractStructural damage inspection after an earthquake is essential for safety assessment of the affected wood-frame buildings and for making knowledgeable decision regarding their repair, renovation, or replacement. We present a polarimetric radar system for sensing the concealed wood-frames damaged by earthquakes. This system employs an antenna array consisting of four linearly polarized Vivaldi antennas recording full-polarimetric radar echoes in an ultra-wideband ranging from 1 to 20 GHz. The detailed design of the system and the signal processing algorithms for high-resolution 3D imaging are introduced. We conducted a number of surveys on damaged wooden wall specimens in laboratory. The experiment results indicate that the high-frequency radar waves can penetrate the wooden walls. Deformations of wooden structures (about 2 cm displacement) inside the wall, as well as the concealed small metal nails (about 3 mm in diameter and less than 2 cm in length) and bolts can be clearly imaged. The shape and orientation of the wooden members have shown a great sensitivity to the radar polarization. It is concluded that radar polarimetry can provide much richer information on the condition of concealed building structures than the conventional single-polarization subsurface penetrating radar. View Full-Text
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Liu, H.; Koyama, C.; Zhu, J.; Liu, Q.; Sato, M. Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System. Remote Sens. 2016, 8, 935.
Liu H, Koyama C, Zhu J, Liu Q, Sato M. Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System. Remote Sensing. 2016; 8(11):935.Chicago/Turabian Style
Liu, Hai; Koyama, Christian; Zhu, Jinfeng; Liu, Qinghuo; Sato, Motoyuki. 2016. "Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System." Remote Sens. 8, no. 11: 935.
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