Evaluation of reduction factors for high-damping design response spectra |
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Authors: | D Cardone M Dolce M Rivelli |
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Institution: | (1) DiSGG, University of Basilicata, Macchia Romana Campus, 85100 Potenza, Italy;(2) Italian Department of Civil Protection, via Vitorchiano 4, 00189 Rome, Italy |
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Abstract: | High-damping response spectra are essential tools for the assessment and design methods based on the equivalent elastic structure
concept. They are also often used for the analysis and design of structures with seismic isolation or energy dissipation systems.
Many formulations of the reduction factors have been proposed and included in seismic codes to estimate high-damping response
spectra from their 5% damping representation. They are reviewed in the present paper. The accuracy of each of them in estimating
the maximum elastic response of structures with viscous damping ratios greater than 5% is assessed by comparing exact and
approximate displacement response spectra for three different damping levels, namely 10, 20 and 30%, respectively. The comparison
is referred to more than 120 ground motion records, relevant to earthquakes with magnitude between 6 and 8, epicentral distance
ranging from 1 to 100 km and Peak Ground Accelerations (PGA’s) greater than 0.1 g. The comparison between exact and approximate
response spectra is carried out for both single earthquakes and groups of earthquakes with similar magnitude and epicentral
distance. The drawbacks of using the same damping reduction factor to estimate both maximum displacement response and design
seismic forces are also addressed. |
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Keywords: | Elastic response spectra Viscous damping ratio Damping reduction factor Natural earthquakes |
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