Abstract
Shaking tables are widely used for testing structural models under earthquake excitations. Real ground motions are reproduced by a moving shaking table platform, which is controlled according to appropriate algorithm that considers the limitations in the platform's maximum displacement. Usually the real ground motion record is scaled to allow reproduction within the platform stroke limitations. Such scaling yields distortion in the spectrum of a ground motion record and the influence of the earthquake on the tested structure. A method for minimization of the undesired effects was developed by the authors previously. It was based on linear models of the tested structure. Closeness of power spectral density and response spectra were chosen as the main optimization criteria of scaling. As known, strong earthquakes lead to nonlinear effects in structural response. Additionally, supplemental dampers that are widely applied in order to enhance the structural seismic response have essentially non-linear characteristics. This should be considered in shaking table testing, including the earthquakes scaling. An earthquake record scaling method, proposed in the present study, is based on criteria that are more consistent with nonlinear nature of the investigated structure. Therefore, it has a much wider range of applications for investigating both linear and nonlinear behavior of structural models. A mathematical formulation of the problem is developed. The effectiveness of the proposed method is demonstrated by comparing the total earthquake energy and response spectrums of real and simulated earthquakes as well as by comparative evaluation of the distortions of their time histories. Additionally, response of a multistorey structural model to real and simulated seismic records is compared. It is shown that using the proposed method for scaling real ground motions yields more accurate reproduction and causes minimum distorsions.
Original language | English |
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Title of host publication | Proceedings of the 11th International Conference on Computational Structures Technology, CST 2012 |
Publisher | Civil-Comp Press |
Volume | 99 |
ISBN (Print) | 9781905088546 |
State | Published - 2012 |
Event | 11th International Conference on Computational Structures Technology, CST 2012 - Dubrovnik, Croatia Duration: 4 Sep 2012 → 7 Sep 2012 |
Conference
Conference | 11th International Conference on Computational Structures Technology, CST 2012 |
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Country/Territory | Croatia |
City | Dubrovnik |
Period | 4/09/12 → 7/09/12 |
Keywords
- Ground motion record
- Optimization criteria
- Response spectra
- Scaling
- Shaking table platform
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Civil and Structural Engineering
- Computational Theory and Mathematics
- Artificial Intelligence