Selecting and Scaling of Real Accelerograms to Reduce the Scatter in Dynamic Response

2010-07-29
Ay, Bekir Özer
Akkar, Dede Sinan
One of the major objectives in ground-motion scaling techniques is to reduce the dispersion (bias) in structural response. The current scaling techniques generally modify the amplitude of each record in a bin to a target peak ground motion value. Although these approaches are proved to be efficient for obtaining suits of scaled records that would yield lower dispersion in spectral demand parameters, they do not warrant any physical basis. This study not only focuses on reducing the scatter in structural response, but also emphasizes the significance of preserving basic seismological features of the records after being scaled. Consequently, the limitations of an alternative scaling methodology are investigated by comparing the results from the conventional procedure described above. The explored methodology uses ground motion prediction equations (GMPEs) and scales each record with known fundamental seismological parameters (i.e. magnitude, distance and site class) by using the estimations obtained from the chosen predictive model. The procedure uses the standard deviation of the chosen GMPE to incorporate the aleatory variability to the entire process. We compiled a ground-motion dataset from Turkish, PEER-NGA and European strong-motion databanks and conducted spectral analyses to compare the efficiency of these two methods in reducing the uncertainty in structural response. The comparative statistics are presented for elastic and constant strength spectral displacements for vibration periods of 0.3s, 0.6s, 0.9s, 1.2s, and 1.5s.
Citation Formats
B. Ö. Ay and D. S. Akkar, “Selecting and Scaling of Real Accelerograms to Reduce the Scatter in Dynamic Response,” presented at the 9th US National and 10th Canadian Conference on Earthquake Engineering (25 - 29 Temmuz 2010), Toronto, Kanada, 2010, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/84731.