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http://dx.doi.org/10.5000/EESK.2008.12.5.023

Dynamic Instability of Strength-Limited Bilinear SDF Systems  

Han, Sang-Whan (한양대학교 건축공학과)
Kim, Jong-Bo (한양대학교 대학원)
Bae, Mun-Su (한양대학교 대학원)
Moon, Ki-Hoon (한양대학교 대학원)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.12, no.5, 2008 , pp. 23-29 More about this Journal
Abstract
This study investigates the dynamic instability of strength-limited bilinear single degree of freedom (SDF) systems under seismic excitation. The strength-limited bilinear hysteretic model best replicates the hysteretic behavior of the steel moment resisting frames. To estimate the dynamic instability of SDF systems, the collapse strength ratio is used, which is the yield-strength reduction factor when collapse occurs. Statistical studies are carried out to estimate median collapse strength ratios and those dispersions of strength-limited bilinear SDF systems with given natural periods, hardening stiffness ratios, post-capping stiffness ratios, ductility and damping ratios ranging from 2 to 20% subjected to 240 earthquake ground motions recorded on stiff soil sites. Equations to calculate median and standard deviation of collapse strength ratios in strength-limited bilinear SDF systems are obtained through nonlinear regression analysis. By using the proposed equations, this study estimated the probabilistic distribution of collapse strength ratios, and compared this with the exact values from which the accuracy of the proposed equations was verified.
Keywords
dynamic stability; strength-limited bilinear model; steel moment resisting frame; collapse strength ratio; regression analysis;
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