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      Application of Rotation Rate Sensors in Modal and Vibration Analyses of Reinforced Concrete Beams

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          Abstract

          The recent rapid development of rotation rate sensor technology opens new opportunities for their application in more and more fields. In this paper, the potential of rotational sensors for the modal analysis of full-scale civil engineering structural elements is experimentally examined. For this purpose, vibrations of two 6-m long beams made of ultra-high performance concrete (UHPC) were measured using microelectromechanical system (MEMS) rotation rate sensors. The beams were excited to vibrations using an impact hammer and a dynamic vibration exciter. The results of the experiment show that by using rotation rate sensors, one can directly obtain derivatives of mode shapes and deflection shapes. These derivatives of mode shapes, often called “rotational modes”, bring more information regarding possible local stiffness variations than the traditional transversal and deflection mode shapes, so their extraction during structural health monitoring is particularly useful. Previously, the rotational modes could only be obtained indirectly (e.g., by central difference approximation). Here, with the application of rotation rate sensors, one can obtain rotational modes and deflection shapes with a higher precision. Furthermore, the average strain rate and dynamic strain were acquired using the rotation rate sensors. The laboratory experiments demonstrated that rotation rate sensors were matured enough to be used in the monitoring and modal analyses of full-scale civil engineering elements (e.g., reinforced concrete beams).

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          Most cited references 44

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          Damage detection from changes in curvature mode shapes

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            Vibration-based Damage Identification Methods: A Review and Comparative Study

             Wei Fan,  Pizhong Qiao (2011)
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              Structural Damage Identification using Modal Data. I: Simulation Verification

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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                20 August 2020
                September 2020
                : 20
                : 17
                Affiliations
                Faculty of Civil Engineering and Architecture, Opole University of Technology, ul. Prószkowska 76, 45-758 Opole, Poland; p.bonkowski@ 123456po.edu.pl (P.A.B.); p.bobra@ 123456po.edu.pl (P.B.); b.jedraszak@ 123456po.edu.pl (B.J.)
                Author notes
                [* ]Correspondence: z.zembaty@ 123456po.edu.pl
                Article
                sensors-20-04711
                10.3390/s20174711
                7506681
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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