A parametric study is devoted to investigating the dynamic instability of soil-structure systems under far-fault earthquakes. The superstructure and soil are simulated as a bilinear single-degree-of-freedom (SDOF) oscillator and based on the cone model concept, respectively. The results show that soil flexibility makes the system dynamically more unstable and that as the non-dimensional frequency increases, the collapse strength-reduction factor highly decreases. Moreover, increasing the aspect ratio leads to a lower collapse strength-reduction factor. However, its effect is found to be negligible. The effects of vibration period and post-yield slope on the collapse strength-reduction factor are the same as on the fixed-base condition. Additionally, comparison of collapse strength-reduction factors resulting from exact time history analyses with those proposed in FEMA 440 for the fixed-base condition shows a great underestimation with errors larger than 20% at approximately all cases and 60% at extreme cases. Finally, a formulation is calibrated using nonlinear regression analysis in order to estimate collapse strength-reduction factors of soil-structure systems.
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Research Article|
November 01, 2015
Dynamic Instability of Soil-SDOF Structure Systems under Far-Fault Earthquakes
Faramarz Khoshnoudian;
Faramarz Khoshnoudian
a)
Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic). Tehran, Iran
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Ehsan Ahmadi;
b)
PhD Student, Department of Civil Engineering, Monash University, Clayton campus, Melbourne, Australia
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Mahdi Kiani;
Mahdi Kiani
c)
Former M.Sc Student, Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic),Tehran, Iran
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Mohammad Hadikhan Tehrani
Mohammad Hadikhan Tehrani
c)
Former M.Sc Student, Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic),Tehran, Iran
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Faramarz Khoshnoudian
a)
Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic). Tehran, Iranb)
PhD Student, Department of Civil Engineering, Monash University, Clayton campus, Melbourne, Australia
Mahdi Kiani
c)
Former M.Sc Student, Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic),Tehran, Iran
Mohammad Hadikhan Tehrani
c)
Former M.Sc Student, Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic),Tehran, Iran
Publisher: Earthquake Engineering Research Institute
Received:
26 Jun 2013
Accepted:
18 Sep 2014
First Online:
01 Jun 2020
Online ISSN: 1944-8201
Print ISSN: 8755-2930
© 2015 Earthquake Engineering Research Institute
Earthquake Engineering Research Institute
Earthquake Spectra (2015) 31 (4): 2419–2441.
Article history
Received:
26 Jun 2013
Accepted:
18 Sep 2014
First Online:
01 Jun 2020
Citation
Faramarz Khoshnoudian, Ehsan Ahmadi, Mahdi Kiani, Mohammad Hadikhan Tehrani; Dynamic Instability of Soil-SDOF Structure Systems under Far-Fault Earthquakes. Earthquake Spectra 2015;; 31 (4): 2419–2441. doi: https://doi.org/10.1193/062613EQS170M
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