Experimental Study on Damping Ratios of in-situ Buildings
Accurate evaluation of damping ratios involving soilstructure interaction (SSI) effects is the prerequisite for seismic design of in-situ buildings. This study proposes a combined approach to identify damping ratios of SSI systems based on ambient excitation technique. The proposed approach is illustrated with main test process, sampling principle and algorithm steps through an engineering example, as along with its feasibility and validity. The proposed approach is employed for damping ratio identification of 82 buildings in Xi-an, China. Based on the experimental data, the variation range and tendency of damping ratios of these SSI systems, along with the preliminary influence factor, are shown and discussed. In addition, a fitting curve indicates the relation between the damping ratio and fundamental natural period of SSI system.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070407Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2008
 A. Kareem, K. Gurley, "Damping in structures: Its evaluation and treatment of uncertainty," Journal of Wind Engineering and Industrial Aerodynamics, vol. 59, no. 2-3, pp. 131-157, 1996.
 P. Bischop, G.Fladwell, "An investigation into the theory of resonance testing," Philosophical Transactions of the Royal Society of London, vol. 255, no. 1055, pp. 241-280, 1963.
 A. M. Abdel-Ghaffar, G. W. Housner, "Ambient vibration tests of suspension bridge," Journal of the Engineering Mechanics Division, ASCE, vol. 104, no. 5, pp. 983-999, 1978.
 H. A. Cole, "On-the-line analysis of random vibration, AIAA/ASME 9th Structure," Structural Dynamics and Materials Conference, AIAA, pp. 68-288, 1968.
 C. S. Huang, C. H. Yeh, "Some properties of randomdec signatures," Mechanical Systems and Signal Processing, vol. 13, no. 3, pp. 491-507, 1999.
 J. K. Vandiver, A. B. Dunwood, R. B. Campbell, M. F. Cook, "A mathematical basis for the random decrement vibration signature analysis technique," Journal of Mechanical Design, vol. 104, no. 4, pp. 307-313, 1982.
 S. R. Ibrahim, and E. C. Mikulcik, "The experimental determination of vibration parameters from time responses," The Shock and Vibration Bulletin, vol. 46, no. 5, pp. 187-196, 1976.
 J. M. Ueng, C. C. Lin, P. L. Lin, "System identification of torsion coupled buildings," Computers & Structures, vol. 74, no. 6, pp. 667-686, 2000.
 Y. Gao, R. B. Randall, "Determination of frequency response functions from response measurements - 1. Extraction of poles and zeros from response cepstra," Mechanical Systems and Signal Processing, vol. 10, no. 3, pp. 293-317, 1996.
 P. V. Overschee, B. DeMoor, "Subspace Algorithms for the Stochastic Identification problem," Proceedings of the 30th IEEE Conference on Decision and Control, Brighton, pp. 1321-1326, 1991.
 B. Peeters, G. De Roeck. "Reference-based stochastic subspace Identification for output-only modal analysis," Mechanical Systems and Signal Processing, vol. 13, no. 11, pp. 855-878, 1999.
 E. Reynders, G. De Roeck. "Reference-based combined deterministic-stochastic subspace identification for experimental and operational modal analysis," Mechanical Systems and Signal Processing, vol. 22, no. 4, pp. 617-637, 2008.
 D. M. Siringoringo, Y. Fujino, "System identification of suspension bridge from ambient vibration response," Engineering Structures, vol. 30, no. 2, pp. 462-477, 2008.
 J. Marks II. Robert, "Introduction to Shannon Sampling and Interpolation Theory", Springer-Verlag, New York, 1991.
 N. Satake, K. Suda, T. Arakawa, A. Sasaki, Y. Tamura, "Damping evaluation using full-scale data of buildings in Japan", Journal of Structural Engineering, ASCE, vol. 129, no. 4, pp. 470-477, 2003.