High spatial resolution operational modal analysis of a football stadium suspension roof

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Amador, S (Author) Other; Magalhães, F. (Author) FEUP; Martins, N (Author) Other; Caetano, E. (Author) FEUP; Cunha, A. (Author) FEUP

Conference proceedings International

Title: 5th International Operational Modal Analysis Conference, IOMAC 2013

Pages: 1-8

5th International Operational Modal Analysis Conference, IOMAC 2013

Guimaraes, 13 May 2013 through 15 May 2013

Indexing

Scopus - 4 Citations

Other information

Authenticus ID: P-00N-EJ8

Abstract (EN): This paper describes the strategies and the techniques employed, as well as the results obtained from the Operational Modal Analysis (OMA) that was performed to extract the modal properties of a football stadium suspension roof located in the city of Braga, Portugal. The purpose of the test was to create a baseline reference subsequently used by the autonomous monitoring system that was installed in one of the slabs of the roof in the beginning of 2009, by the Laboratory of Vibrations and Structural Monitoring (ViBest, www.fe.up.pt/vibest) of the Faculty of Engineering of University of Porto (FEUP), aiming at assessing the health condition of the roof structure along the time. The structure consists of two slabs that are suspended by 32 pairs of full locked coil cables with diameters ranging from 80 to 86mm. The test was carried out in one of the slabs of the roof structure by measuring the vertical responses induced by ambient sources (e. g. wind and the traffic in the surroundings of the stadium) using of set of six moving tri-axial seismographs and six fixed uni-axial accelerometers. Two different data acquisition systems were used, one for the moving sensors and another for the fixed reference sensors, and the responses were collected using 15 different datasets, which permitted to measure the vertical accelerations of a total of 90 points. The employment of robust pre-processing techniques to synchronize the data collected by both acquisition systems, as well as of the combination of some of the state-of-art parametric OMA techniques, provided an accurate estimation of a large number of modes of the roof structure in the frequency range of 0-2 Hz with high spatial resolution for the corresponding modes shapes of vibration.

Language: English

Type (Professor's evaluation): Scientific