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Sensors 2016, 16(11), 1882; doi:10.3390/s16111882

Determination Method of Bridge Rotation Angle Response Using MEMS IMU

1
Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya 158-0082, Japan
2
Maintenance and Transportation Division, Metropolitan Expressway Co., Ltd., 1-4-1 Kasumigaseki, Chiyoda-ku 100-8930, Japan
3
Tokyo City University, 1-28-1 Tamazutsumi, Setagaya 158-8557, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Mariani
Received: 30 August 2016 / Revised: 28 October 2016 / Accepted: 7 November 2016 / Published: 9 November 2016
(This article belongs to the Collection Modeling, Testing and Reliability Issues in MEMS Engineering)
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Abstract

To implement steel bridge maintenance, especially that related to fatigue damage, it is important to monitor bridge deformations under traffic conditions. Bridges deform and rotate differently under traffic load conditions because their structures differ in terms of length and flexibility. Such monitoring enables the identification of the cause of stress concentrations that cause fatigue damage and the proposal of appropriate countermeasures. However, although bridge deformation monitoring requires observations of bridge angle response as well as the bridge displacement response, measuring the rotation angle response of a bridge subject to traffic loads is difficult. Theoretically, the rotation angle response can be calculated by integrating the angular velocity, but for field measurements of actual in-service bridges, estimating the necessary boundary conditions would be difficult due to traffic-induced vibration. To solve the problem, this paper proposes a method for determining the rotation angle response of an in-service bridge from its angular velocity, as measured by a inertial measurement unit (IMU). To verify our proposed method, field measurements were conducted using nine micro-electrical mechanical systems (MEMS) IMUs and two contact displacement gauges. The results showed that our proposed method provided high accuracy when compared to the reference responses calculated by the contact displacement gauges. View Full-Text
Keywords: bridge health monitoring; micro-electro-mechanical systems; inertial measurement unit; rotation angle response; angular velocity; free vibration bridge health monitoring; micro-electro-mechanical systems; inertial measurement unit; rotation angle response; angular velocity; free vibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sekiya, H.; Kinomoto, T.; Miki, C. Determination Method of Bridge Rotation Angle Response Using MEMS IMU. Sensors 2016, 16, 1882.

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