Visn. Nac. Akad. Nauk Ukr. 2018. (7):40-47
https://doi.org/10.15407/visn2018.07.040
Yu.V. Semenova
Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Kyiv
MODELING OF SOILS RESPONSE UNDER SEISMIC IMPACT FOR ENSURING SEISMIC RESISTANCE OF BUILDINGS ACCORDING TO EUROPEAN STANDARDS
According to the materials of scientific report at the meeting of the Presidium of NAS of Ukraine, May 30, 2018
In the article the task of accounting for resonant and non-linear effects in soils during seismic microzoning of construction and operation sites is solved. The method of determining the resonant properties of soils while accounting for their nonlinearity for the purpose of seismic proof designing of buildings and structures on the construction sites of Ukraine is developed and introduced into practical application. The developed method is based on an analytical-empirical approach for calculating the frequency characteristics of soils. Improved method of constructing of the frequency characteristics of ground is necessary for adjusting the methods of seismic microzoning of areas of buildings and industrial structures placement in seismic regions of Ukraine with the regulatory requirements of European standards “Eurocode-8”. The method of calculating the frequency characteristics of soils is based on forming computational models of soil strata using their empirical deformation characteristics and application of mathematical equivalent linear and nonlinear modeling of soil response to seismic influences. The construction of seismic calculation models uses strain-dependent shear modulus and damping ratio from the database which comprises the deformation properties of different soil types typical for sites located in Ukraine. The improved method for determining the resonance properties of soils has been implemented in the determination of seismic hazard of sites of a number of existing and projected objects, such as hydroelectric power plants, nuclear power plants, high-rise housing and experimental buildings, public centers, gas transmission stations, etc.
Keywords: earthquake, seismic hazard, seismic microzoning, mathematical modeling, nonlinear soil properties, frequency response, resonance properties of soils.
Language of article: ukrainian
REFERENCES
1. Construction in seismic regions of Ukraine. DBN V.1.1-12:2014. (State Regulatory Document). Kyiv: Minrehionbud Ukrayiny, 2014.
- Kendzera O.V. Seismic hazard and seismic protection in Ukraine. Ukrainian Geographical Journal. 2015. (3): 9. https://doi.org/10.15407/ugz2015.03.009
- Ishihara K. Soil Behaviour in Earthquake Geotechnics. (Oxford University Press, 1996). https://doi.org/10.1002/(SICI)1096-9845(199711)26:11<1187::AID-EQE663>3.0.CO;2-Q
4. Kramer S.L. Geotechnical Earthquake Engineering. (Pearson, 1996).
5. Seed H.B., Idriss I.M. Soil Moduli and Damping Factors for Dynamic Response Analysis. Report UCB/EERC-70/10. Earthquake Engineering Research Center, University of California, Berkeley, 1970.
6. Vucetic M., Dobry R. Effect of soil plasticity on cyclic response. J. Geotech. Eng. 1991. 117: 89. https://doi.org/10.1061/(ASCE)0733-9410(1991)117:1(89)
7. Lanzo G., Pagliaroli A., Tommasi P., Chiocci F.L. Simple shear testing of sensitive, very soft offshore clay for wide strain range. Canadian Geotech. J. 2009. 46(11): 1277. https://doi.org/10.1139/T09-059
8. Ishibashi I., Zhang X.J. Unified dynamic shear moduli and damping ratios of sand and clay. Soils and Foundations. 1993. 33(1): 182. https://doi.org/10.3208/sandf1972.33.182
9. Roblee C., Chiou B. A proposed geoindex model for design selection of non-linear properties for site response analyses. In: Proc. Int. Workshop on Uncertainties in Nonlinear Soil Properties and Their Impact on Modeling Dynamic Soil Response. UC Berkeley, 2004.
10. ProShake Ground Response Analysis Program. Version 1.1. User’s Manual. Washington, 1998.
11. Bardet J.P., Ichii K., Lin C.H. EERA: A computer program for equivalent-linear earthquake site response analysis of layered soil deposits. Department of Civil Engineering, University of Southern California. 2000.
12. Hashash Y. DeepSoil User Manual and Tutorial. Department of Civil and Environmental Engineering University of Illinois at Urbana-Champaign. Board of Trustees of University of Illinois at Urbana-Champaign. 2012.
13. Aleshin A.S. Seismic micro zoning of especially important objects. (Moscow: Svetoch Plus, 2010).
14. Yoshida N., Iai S. Nonlinear site response and its evaluation and prediction. In: Proc. 2nd Int. Symp. on the Effect of Surface Geology on Seismic Motion. 1998. P. 71–90.
15. Kumar A., Harinarayan N., Baro O. High amplification factor for low amplitude ground motion: Assessment for Delhi. Disaster Advances. 2015. 8(12): 1.