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Title: FRF-based modal testing of the highest timber building in the world in operation using wireless accelerometers
Authors: Pavic, A
Ao, WK 
Tulebekova, S
Malo, KA
Rønnquist, A
Issue Date: 2024
Source: Journal of physics. Conference series, 2024, v. 2647, no. 24, 242009
Abstract: This paper describes practical application of a novel and oven-controlled crystal oscillator (OCXO) high-precision synchronised wireless data acquisition system for a modal testing of the tallest all-timber building in the world - the 18-storey, 88.8m tall Mjøstårnet (the Mjøsa Tower) in Brumunddal, Norway. The modal testing was challenging as it was conducted in an occupied building in normal operation and was based on measuring both dynamic excitation and response yielding a set of frequency response functions (FRFs) across four different floors of the building. To the best knowledge of the authors, this was the first time that an FRF-based modal test was attempted on such a large building structure in operation. Moreover, although the structure was in operation, the testing was completed in only 48h, including commissioning and de-commissioning of all of the instrumentation, yielding a full set of point- and transfer accelerance FRFs. The paper presents the equipment used, key logistical challenges and quality assurance steps made to assure measurement of good quality FRF data in such short period of time demonstrating feasibility of the whole exercise. A total of seven modes of vibration, including higher order modes of vibration were estimated by curve-fitting the measured FRF data. This includes the 3rd bending and 2nd torsion modes difficult to measure via the standard ambient vibration testing of tall buildings. These modes could be used to investigate a number of uncertain modelling features in tall timber buildings, such as the stiffness of timber joints.
Publisher: Institute of Physics Publishing
Journal: Journal of physics. Conference series 
ISSN: 1742-6588
EISSN: 1742-6596
DOI: 10.1088/1742-6596/2647/24/242009
Rights: Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Published under licence by IOP Publishing Ltd
The following publication Pavic, A., Kei Ao, W., Tulebekova, S., Malo, K. A., & Rønnquist, A. (2024). FRF-based modal testing of the highest timber building in the world in operation using wireless accelerometers. Journal of Physics: Conference Series, 2647(24), 242009 is available at https://doi.org/10.1088/1742-6596/2647/24/242009.
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