Browse > Article
http://dx.doi.org/10.5000/EESK.2008.12.4.019

Output-Only System Identification and Model Updating for Performance Evaluation of Tall Buildings  

Cho, Soon-Ho (광주대학교 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.12, no.4, 2008 , pp. 19-33 More about this Journal
Abstract
Dynamic response measurements from natural excitation were carried out for 25- and 42-story buildings to evaluate their inherent properties, such as natural frequencies, mode shapes and damping ratios. Both are reinforced concrete buildings adopting a core wall, or with shear walls as the major lateral force resisting system, but frames are added in the plan or elevation. In particular, shear walls in a 25-story building are converted to frames from the 4th floor level downwards while maintaining a core wall throughout, resulting in a fairly complex structure. Due to this, along with similar stiffness characteristics in the principal directions, significantly coupled and closely spaced modes of motion are expected in this building, making identification rather difficult. By using various state-of-the-art system identification methods, the modal parameters are extracted, and the results are then compared. Three frequency-domain and four time-domain based operational modal identification methods are considered. Overall, all natural frequencies and damping ratios estimated from the different identification methods showed a greater consistency for both buildings, while mode shapes exhibited some degree of discrepancy, varying from method to method. On the other hand, in comparison with analysis results obtained using the initial finite element(FE) models, test results exhibited a significant difference of about doubled frequencies, at least for the three lower modes in both buildings. To improve the correlation between test and analysis, a few manual schemes of FE model updating based on plausible reasons have been applied, and acceptable results are obtained. The advantages and disadvantages of each identification method used are addressed, and some difficulties that might arise from the updating of FE models, including automatic procedures, for such large structures are carefully discussed.
Keywords
dynamic properties; experimental modal analysis; finite element analysis; model updating; natural vibration; operational modal analysis; system identification; tall buildings;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Cauberghe, B., "Applied Frequency-domain System Identification in the Field of Experimental and Operational Modal Analysis," Ph.D. thesis, Dept. of Mech. Engrg., Vrije Universiteit Brussel, Brussels, Belgium, 2004
2 Brinker, R. and Anderson, P., "A Way of Getting Scaled Mode Shapes in Output Only Modal Testing," Proc., 21st Int. Modal Analysis Conf., Kissimmee, Florida, USA, 2003
3 Ewins, D. J., Modal testing: Theory, Practice and Application, Research Studies Press, Baldock, Hertfordshire, UK, 2000
4 Felber, A. J., ''Development of a Hybrid Bridge Evaluation System,'' Ph.D. thesis, Univ. of British Columbia, Vancouver, Canada, 1993
5 Heylen, W., Lammens, S., and Sas, P., Modal Analysis Theory and Testing, Dept. of Mech. Engrg., Katholieke Univ. Leuven, Heverlee, Belgium, 1995
6 Ho, B. L. and Kalman, R. E., ''Effective Construction of Linear State Variable Models from Input/Output Data,'' Regelungstechnik, Vol. 14, 1966, pp. 545-548
7 Brinker, R., Zhang, L., and Anderson, P., "Modal Identification from Ambient Responses Using Frequency Domain Decomposition," Proc.,18th Int. Modal Analysis Conf., San Antonio, Texas, USA, 2000
8 Peeters, B. and Ventura, C., "Comparative Study of Modal Analysis Techniques for Bridge Dynamic Characteristics," Mech. Syst. Signal Process., Vol. 17, No. 5, 2003, pp. 965-988   DOI   ScienceOn
9 Van Overschee, P., and De Moor, B., Subspace Identification for Linear Systems: Theory-Implementation-Applications, Kluwer Academic Publishers, Dordrecht, The Netherlands, 1996
10 Reynders, E. and De Roeck, G., "What's New in System Identification for Experimental and Operational Modal Analysis," Proc., Thematic Conf. on Comput. Meth. in Struct. Dyn. and Earthq. Engrg., Rethymno, Crete, Greece, 2007
11 Structural Vibration Solutions, "ARTeMIS Extractor: Ambient Response Testing and Modal Identification Software, User's Manual," Demark, 2001
12 Peeters, B., Van Der Auweraer, H., Guillaume, P., and Leuridan J., "The PolyMAX Frequency-domain Method: a New Standard for Modal Parameter Estimation," Shock and Vib., Special Issue dedicated to Prof. Bruno Piombo, Vol. 11, 2004, pp. 395-409
13 Turek, M., Ventura C. E., and Guerrero, S., "Ambient Vibration Testing and Model Updating of a 44-Storey Building in Vancouver, Canada," Proc., 25th Int. Modal Analysis Conf., Orlando, Florida, USA, 2007
14 Peeters, B. and De Roeck, G., "Stochastic System Identification for Operational Modal Analysis: a Review," J. Dyn. Syst., Meas., and Control, ASME, Vol. 123, No. 12, 2001, pp. 659-667   DOI   ScienceOn
15 Juang, J.-N., Applied System Identification, Prentice- Hall, Upper Saddle River, NJ, 1994
16 Maia, N. and Silva, J., Theoretical and Experimental Modal Analysis, Research Studies Press, Taunton, 1997
17 Midas IT, "Midas/Gen: General Structural Design System for Windows, Online Manual, V.7.1.1 (R2)," Korea, 2006
18 Peeters, B., "System Identification and Damage Detection in Civil Engineering," Ph.D. thesis, Dept. of Civil Engrg., Katholieke Univ. Leuven, Heverlee, Belgium, 2000
19 Peeters, B. and De Roeck, G., "Reference-based Stochastic Subspace Identification for Output-only Modal Analysis," Mech. Syst. Signal Process., Vol. 13, No. 6, 1999, pp. 855-878   DOI   ScienceOn
20 Akaike, H., "Stochastic Theory of Minimal Realization," IEEE Trans. Autom. Control, Vol. 19, 1974, pp. 667-674   DOI
21 Reynders, E. and De Roeck, G., "Reference-based Combined Deterministic-stochastic Subspace Identification for Experimental and Operational Modal Analysis," Mech. Syst. Signal Process., submitted for publication, 2007
22 Charker, A. A., and Cherifati, A., "Influence of Masonry Infill Panels on the Vibration and Stiffness Characteristics of R/C Frame Buildings," Earthquake Engrg. Struct. Dyn., Vol. 28, 1999, pp. 1061-1065   DOI   ScienceOn
23 Goethals, I. and De Moor, B., "Model Reduction and Energy Analysis as a Tool to Detect Spurious Modes," Proc., ISMA 2002 Int. Conf. on Noise & Vib. Engrg., Katholieke Univ. Leuven, Heverlee, Belgium, 2002