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Development of lateral displacement sensor for real‐time detection of structural damage
Author(s) -
Matsuya Iwao,
Tomishi Ryota,
Sato Maya,
Kanekawa Kiyoshi,
Nitta Yoshihiro,
Takahashi Motoichi,
Miura Satoru,
Suzuki Yasutsugu,
Hatada Tomohiko,
Katamura Ryuta,
Tanii Takashi,
Shoji Shuichi,
Nishitani Akira,
Ohdomari Iwao
Publication year - 2011
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20654
Subject(s) - displacement (psychology) , exciter , structural engineering , earthquake shaking table , structural health monitoring , residual , stiffness , acoustics , vibration , ceiling (cloud) , detector , waveform , engineering , computer science , electrical engineering , voltage , physics , psychology , algorithm , psychotherapist
We have developed a novel sensor that enables us to measure the relative story displacement of a building structure in real time. This lateral displacement sensor (LDS) is composed of a light‐emitting diode (LED) array, which is fixed on the ceiling, and a position‐sensitive detector (PSD) unit, which is placed on the floor. We optimized the LDS to achieve high accuracy in lateral displacement measurement. The accuracy was evaluated to be 60 µm by conducting shaking table tests. Two LDSs were implemented in an actual building equipped with an active variable stiffness (AVS) system, and the building was vibrated with seismic waveforms by an exciter placed on the rooftop. The seismic displacement of the second floor relative to the first floor was measured using the LDS. Furthermore, the inclination angle of the second floor could be measured using the LDS during the seismic vibration. Using the AVS system, we realized the residual displacement of the second floor without inducing damage to the building, and succeeded in real‐time residual displacement measurement for the first time. These results indicate that the LDS is useful for the health diagnosis of a building structure. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.