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Earthquakes and Structures Volume 7, Number 1, July 2014 , pages 83-99 DOI: https://doi.org/10.12989/eas.2014.7.1.083 |
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Higher-mode effects for soil-structure systems under different components of near-fault ground motions |
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Faramarz Khoshnoudian, Ehsan Ahmadi, Sina Sohrabi and Mahdi Kiani
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| 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. | ||
| Key Words | ||
| near-fault ground motions; high-frequency effects; higher-mode effects; soil-structure interaction; multiple story structures | ||
| Address | ||
| Faramarz Khoshnoudian and Ehsan Ahmadi: Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran, Iran Sina Sohrabi: School of Engineering, Shiraz University, Zand Ave.,Shiraz, Iran Mahdi Kiani: Deprtment of Civil Engineering,Babol Noshirvani Institue of Technology,Babol,Iran | ||