Comparison of ground motion scaling methods by considering vertical ground motions

Oğuz, Umut
The increasing popularity of nonlinear time history analysis has created a demand for ground motion data that is consistent with the seismicity of the region. To meet this need as well as the target design criteria, engineers have started to scale ground motion records. Recent studies have shown that the vertical component of a ground motion can significantly change the results of an analysis. This situation has created a debate about how to scale the vertical component of the ground motions. There exists two alternatives that are commonly applied. In the first alternative, a scaling factor determined only by considering horizontal components of ground motion records is applied to both horizontal and vertical components of a ground motion. In the second alternative, different scaling factors are applied to horizontal and vertical components of ground motions. In this study, the methods of ground motion scaling have been compared by conducting nonlinear time history analyses with ground motions scaled by the mentioned methods.For this purpose, nonlinear time history analyses are conducted for selected building typologies.


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The seismic safety of dam structures is often evaluated using time history analyses conducted with a limited number of ground motions. The selection and scaling of the ground motions is usually the most effective factor determining the results of the safety assessment. The inherent variability in the ground motion as well as the difficulty of conducting the analyses for a large number of ground motions renders the selection as the most important factor in the analysis results. The guidelines for the nonline...
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Full time series of ground acceleration are required for nonlinear time history analyses to evaluate the dynamic response of a structure under earthquake excitations. In regions with sparse ground motion data, alternative ground motion simulation techniques are used to generate acceleration time series with varying levels of accuracy. While using simulated records for engineering purposes, it is critical to investigate the efficiency of these records in predicting the real engineering demands. For this purp...
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Time history analysis that requires a proper ground motion selection is becoming popular as computational methods advance. It has been known that scaling any ground motion will not be the best fit to be used in the time history analysis. Over the years, scientists have studied recorded ground motion data by the help of a set of intensity measures to characterize the movement. The aim of this study is to compare intensity measures of ground motions with seismic demand parameters used in nonlinear time histor...
Citation Formats
U. Oğuz, “Comparison of ground motion scaling methods by considering vertical ground motions,” M.S. - Master of Science, Middle East Technical University, 2022.