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http://dx.doi.org/10.12989/eas.2014.7.1.083

Higher-mode effects for soil-structure systems under different components of near-fault ground motions  

Khoshnoudian, Faramarz (Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Ahmadi, Ehsan (Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Sohrabi, Sina (School of Engineering, Shiraz University)
Kiani, Mahdi (Deprtment of Civil Engineering, Babol Noshirvani Institue of Technology)
Publication Information
Earthquakes and Structures / v.7, no.1, 2014 , pp. 83-99 More about this Journal
Abstract
This study is devoted to estimate higher-mode effects for multi-story structures with considering soil-structure interaction subjected to decomposed parts of near-fault ground motions. The soil beneath the super-structure is simulated based on the Cone model concept. Two-dimensional structural models of 5, 15, and 25-story shear buildings are idealized by using nonlinear stick models. The ratio of base shears for the soil-MDOF structure system to those obtained from the equivalent soil-SDOF structure system is selected as an estimator to quantify the higher-mode effects. The results demonstrate that the trend of higher-mode effects is regular for pulse component and has a descending variation with respect to the pulse period, whereas an erratic pattern is obtained for high-frequency component. Moreover, the effect of pulse component on higher modes is more significant than high-frequency part for very short-period pulses and as the pulse period increases this phenomenon becomes vice-versa. SSI mechanism increases the higher-mode effects for both pulse and high-frequency components and slenderizing the super-structure amplifies such effects. Furthermore, for low story ductility ranges, increasing nonlinearity level leads to intensify the higher-mode effects; however, for high story ductility, such effects mitigates.
Keywords
near-fault ground motions; high-frequency effects; higher-mode effects; soil-structure interaction; multiple story structures;
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