Finite-Element Model Tuning of Global Modes of a Grandstand Structure Using Ambient Vibration Testing
Publication: Journal of Performance of Constructed Facilities
Volume 23, Issue 6
Abstract
This paper describes the experimental and analytical modal analysis of a full-scale cantilevered grandstand. A 3D finite-element model was successfully updated manually based on the global modes identified from ambient vibration measurements. The ambient vibration testing was effective in capturing the global modes of the large grandstand. A number of global vibration modes of the entire grandstand were reliably identified in the frequency range 0–3.1 Hz, in addition to modes in the same frequency range that engaged primarily the cantilever roof structure. Following a two-stage manual FE model updating process, the correlation between the experimental and analytical results showed good agreement, with physically meaningful updated parameters. It was clearly illustrated that both the roof system and the nonstructural elements contributed significantly to the stiffness and mass of the global modes. Useful and novel lessons are highlighted for efficient and reliable future finite-element modeling of global modes of similar grandstand structures.
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Acknowledgments
The writers acknowledge the financial assistance provided by the U.K. Engineering and Physical Sciences Research Council (EPSRC) through a research grant entitled “Dynamic Behavior of Stadia Under Human Occupation and Excitation” (Grant No. UNSPECIFIEDGR/S73761/01). The Ministry of Higher Education in Egypt is acknowledged for awarding channel system scholarship to Dr. Ghada Saudi as a previous visiting Ph.D. student at Sheffield University to conduct this work as a part of her Ph.D. research. Thanks also go to Mr. Milan Peric and Dr. Prasenjit Mohanty for their assistance during the field testing.
References
Bendat, J. S., and Piersol, A. G. (1993). Engineering applications of correlation and spectral analysis, 2nd Ed., Wiley, New York.
Brincker, R., and Andersen, P. (2006). “Understanding stochastic subspace identification.” Proc., 24th Int. Modal Analysis Conf. (IMAC), St. Louis.
Brincker, R., Ventura, C. E., and Andersen, P. (2001). “Damping estimation by frequency domain decomposition.” Proc., IMAC 19th Int. Modal Analysis Conf., Kissimmee, Fla.
Brincker, R., Zhang, L., and Andersen, P. (2000). “Modal identification from ambient responses using frequency domain decomposition.” Proc., IMAC 18th Int. Modal Analysis Conf., San Antonio, 625–630.
Brownjohn, J. M. W., Pan, T. C., and Deng, X. Y. (2000). “Macro-updating of finite element modeling for core systems of tall buildings.” Proc., 14th Engineering Mechanics Conf., Austin, Tex.
Brownjohn, J. M. W., and Xia, P. (2000). “Dynamic assessment of a curved cable-stayed bridge by model updating.” J. Struct. Eng., 126(2), 252–260.
Dynamic Design Solutions (DDS) N.V. (2004). FEMtools for Windows version 3.0 users’ manual, Leuven, Belgium.
Ewins, D. J. (2000). Modal testing, theory, practice, and application, Research Studies, Hertfordshire, U.K.
Friswell, M. I., and Mottershead, J. E. (1995). Finite element model updating in structural dynamics, Kluwer Academic, Dordrecht, The Netherlands.
Herlufsen, H., Andersen, P., and Gade, S. (2005). “Identification techniques for operational modal analysis—An overview and practical experiences.” Proc., 1st Int. Operational Modal Analysis Conf., Copenhagen, Denmark.
IStructE. (2001). Dynamic performance requirements for permanent grandstands subject to crowd action: Interim guidance on assessment and design, London.
Peeters, B. (2000). “System identification and damage detection in civil engineering.” Ph.D. thesis, Dept. of Civil Engineering, Katholieke Universiteit Leuven, Belgium.
Reynolds, P., Mohanty, P., and Pavic, A. (2005). “Use of operational modal analysis on empty and occupied stadia structures (invited overview paper).” Proc., 1st Int. Operational Modal Analysis Conf. (IOMAC), Copenhagen, Denmark.
Reynolds, P., and Pavic, A. (2002). “Modal testing of a sports stadium.” Proc., 20th Int. Modal Analysis Conf. (IMAC XX), Los Angeles.
Reynolds, P., Pavic, A., and Ibrahim, Z. (2004). “Changes of modal properties of a stadium structure occupied by a crowd.” Proc., 22nd Int. Modal Analysis Conf. (IMAC XXII), Dearborn, Detroit.
Salyards, K. A., and Hanagan, L. M. (2005). “Evaluation of a finite element model for dynamic characteristic prediction of a stadium facility.” Proc., 23rd Int. Modal Analysis Conf., Orlando, Fla.
Wyatt, T. A. (1989). Design guide on the vibration of floors, Steel Construction Institute, London.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 23 • Issue 6 • December 2009
Pages: 467 - 479
Copyright
© 2009 ASCE.
History
Received: Sep 23, 2008
Accepted: Apr 22, 2009
Published online: Apr 24, 2009
Published in print: Dec 2009
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