Operational modal analysis of a ten-storey building featuring vertical modes

Zhu, Z, Wang, X ORCID: 0000-0003-4559-6883, Au, SK, Xie, YL and Brownjohn, J (2025) Operational modal analysis of a ten-storey building featuring vertical modes. Journal of Civil Structural Health Monitoring, 15 (8). pp. 3439-3455. ISSN 2190-5452

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Abstract

As a contribution to addressing challenges and improving technology in field implementation and practice of ‘operational modal analysis’ (OMA), a vibration test was carried out on a 10-storey rectangular building, featuring modal identification for both horizontal and vertical axes over a grid of 80 locations. The study used six triaxial accelerometers in 20 setups and the particular challenges with data are with close/buried modes, significant noise disparity, and contamination with harmonic signals in two frequency bands around 2 Hz and 8 Hz, which are addressed using recently developed techniques in Bayesian OMA. A particular feature of the building dynamic behaviour in the higher band of modes revealed by the study was a set of global vertical vibration modes. In addition to the short-term multi-setup test, two months of monitoring data were collected using a single accelerometer on the top floor to study amplitude dependence and ensemble statistics of modal properties, particularly for the first horizontal mode. The results reveal that the natural frequencies of the first three modes decrease with the vibration level while the damping of the first mode shows an increasing trend. The field data used in this study are archived in an open repository for public access.

Item Type:	Article
Additional Information:	This version of the article has been accepted for publication, after peer review and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://doi.org/10.1007/s13349-025-00998-8
Uncontrolled Keywords:	Ambient vibration test; Operational modal analysis; Vertical modes; Buried modes; Multiple setups; BAYOMA; 4005 Civil Engineering; 40 Engineering; 0905 Civil Engineering; 4005 Civil engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Engineering and Built Environment
Publisher:	Springer
Date of acceptance:	23 July 2025
Date of first compliant Open Access:	15 September 2026
Date Deposited:	15 Sep 2026 10:14
Last Modified:	15 Sep 2026 10:14
DOI or ID number:	10.1007/s13349-025-00998-8
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29426

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