Identification of Multi-Axial Seismic Loadings from Several Structural Dynamic Responses

Abstract:

A new method is proposed to identify multi-axial seismic loadings from structural dynamic responses on limited degrees of freedom. The seismic loadings acting on structures are modeled by Hartley series approximation, and the sensitivities of structural dynamic response with respect to the unknown approximation coefficients are derived. The identification equation is set up based on best fitting structural measured and calculated responses, and is solved with the damped least-squares method. A five-story three-dimensional steel frame structure excited by El-Centro seismic accelerations is studied for validating the proposed method. Numerical simulations with measurement noise and model errors show that the proposed method can accurately identify all seismic loadings from only several responses of the structure.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 2483-2487
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.2483
• Online since: October 2012
• Authors: Kun Zhang*, Hui Li, Zhong Dong Duan, Siu Seong Law
• Keywords: Dynamic Response, Identification, Limited Measurements, Seismic Loading, Sensitivity

References

[1] X. Zhao, Y.L. Xu, J. Chen and J. Li: Journal of Sound and Vibration Vol.291(1-2) (2006), p.215.

[2] A. Zerva and O. Zhang: Probabilistic Engineering Mechanics Vol.11 (1996), p.229.

[3] R.P. Dhakal, J.B. Mander and N. Mashiko: Earthquake Engineering & Structural Dynamics Vol.35(8) (2006), p.989.

[4] L.G. Baise and S.D. Glaser: Bulletin of the Seismological Society of America Vol.90(4) (2000), p.993.

[5] A. Saadatmandia, M. Razzaghiab and M. Dehghana: International Journal of Computer Mathematics 82(9) (2005), p.1149.

[6] A.M. Tikhonov: Soviet Mathematics Vol.4 (1963), p.1035.

[7] P. C. Hansen: SIAM Review Vol.34 (4) (1992), p.561.