Effects of Tectonic Regimes on Damping Modification Factors


Abstract eng:
High-damping spectral amplitudes and corresponding damping reduction factors (ƞ) are key parameters for seismic design and analysis of structures equipped with seismic protection systems, as well as for displacement-based design methodologies. In addition, spectral amplitudes at damping levels lower than 5% are important for design and safety evaluation of lightly damped structures such as transmission lines. Although various expressions for ƞ factors are proposed in the literature, they were mainly developed based on shallow crustal ground motions. However, seismically-active regions such as Japan or south-western British Columbia experience different types of ground motions, such as deep inslab and interface subduction earthquakes. To fill this gap, ƞ factors corresponding to these types of events are investigated in this paper. The developed ƞ factors are based on a large and comprehensive database including records from relevant earthquakes, such as the 2011 Tohoku event. For comparison purposes, ƞ factors corresponding to shallow crustal events are also proposed. The dependency of damping modification factors on soil class and the period at which probabilistic seismic hazard analysis is conducted is shown negligible. We illustrate the dependency of ƞ factors on period, particularly for inslab events. Period-dependent equations are proposed to predict the ƞ factors for damping ratios between 1% and 30% corresponding to deep inslab and interface subduction earthquakes, as well as shallow crustal events.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 2827.:
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