Soil-Foundation-Structure Interaction Effects on Nonlinear Seismic Demand of Structures (2010)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
University of Canterbury. Mechanical Engineering
Investigating the seismic demand of structures integrating soil-foundation-structure interaction (SFSI) effects is a demanding task as a result of the complexity of the coupled dynamic problem. It is also augmented by the impact of uncertainty in the soil and structural parameters along with the randomness in earthquake characteristics. The objective of this research is to highlight SFSI effects on the seismic demand of nonlinear structures through a probabilistic methodology varying soil and structural parameters in a realistic combination and enforcing the adopted models to a range of earthquakes with different spectrum and type. Specifically, 1.36 million nonlinear time-history simulations are run over: (i) models consisting of a SDOF superstructure and a rheological soil-shallow foundation element; and (ii) their corresponding fixed-base models. The demand modification in structural distortion, drift and total displacement due to consideration of SFSI compared to the results of the corresponding fixed-base systems are quantified through a comprehensive statistical presentation. The results contradict prevailing views of the beneficial role of SFSI and show it does not hold in all cases. However, it does show that SFSI effects can be safely ignored with 50% confidence. The rigorous statistical Monte Carlo analysis presented is a significant first step towards reliability-based seismic design procedures incorporating foundation flexibility.
CitationMoghaddasi, M., Cubrinovski, M., Pampanin, S., Carr, A.J., Chase, J.G. (2010) Soil-Foundation-Structure Interaction Effects on Nonlinear Seismic Demand of Structures. Wellington, New Zealand: 2010 New Zealand Society of Earthquake Engineering (NZSEE) Conference, 26-28 Mar 2010. NZSEE Conference Proceedings 2010, Paper 17, 9pp.
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ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
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Probabilistic evaluation of soil-foundation-structure interaction effects on seismic structural response Moghaddasi, M.; Cubrinovski, M.; Chase, Geoff; Pampanin, Stefano; Carr, A. (University of Canterbury. Civil and Natural Resources EngineeringUniversity of Canterbury. Mechanical Engineering, 2011)Complex seismic behaviour of soil-foundation-structure (SFS) systems together with uncertainties in system parameters and variability in earthquake ground motions result in a significant debate over the effects of ...
Effects of soil-foundation-structure interaction on seismic structural response via robust Monte Carlo simulation Moghaddasi, M.; Cubrinovski, M.; Chase, Geoff; Pampanin, Stefano; Carr, A. (University of Canterbury. Civil and Natural Resources EngineeringUniversity of Canterbury. Mechanical Engineering, 2011)Uncertainties involved in the characterization and seismic response of soil-foundation-structure systems along with the inherent randomness of the earthquake ground motion result in very complex (and often controversial) ...
Loye, A.K.; Evans, S.J.; Lin, S.L.; Dhakal, Rajesh (University of Canterbury. Civil and Natural Resources Engineering, 2013)This paper investigates the validity of the soil considerations used in the determination of seismic demand as part of NZS1170.5, which currently specifies seismic design spectra corresponding to 5 different soil types. ...