Abstract
The Vrancea subcrustal earthquakes of August 30, 1986 and May 30, 1990 are the two most recent seismic events that have occurred in Romania with moment magnitudes M W ≥ 6.9. The spectral analysis of the strong ground motions recorded in Bucharest reveals that despite small differences in magnitude between the 1986 and 1990 earthquakes, their frequency contents are very different, sometimes even opposing. The main focus of this study is to conduct a comparative analysis of the response spectra in terms of the bi-normalized response spectra (BNRS) proposed by Xu and Xie (2004 and 2007) for strong ground motions recorded in Bucharest during these two seismic events. The mean absolute acceleration and relative velocity response spectra for the two earthquakes are discussed and compared. Furthermore, the mean bi-normalized absolute acceleration and normalized relative velocity response spectra with respect to the control period T C are computed for the ground motions recorded in Bucharest in 1986 and 1990. The predominant period T P is also used in this study for the normalization of the spectral period axis. Subsequently, the methodology proposed by Martinez-Perreira and Bommer (1998) is applied in order to estimate the seismic intensity of the two events. The results are discussed and several conclusions regarding the possibility of using the bi-normalized response spectra (BNRS) are given.
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References
Araya R and Saragoni GR (1984), “Earthquake Accelerogram Destructiveness Potential Factor,” Proceedings of the 8th World Conference on Earthquake Engineering, San Francisco, USA, pp. 835–842.
Arias A (1970), “A Measure of Earthquake Intensity,” In RJ Hansen, ed., Seismic Design for Nuclear Power Plants, MIT Press, Cambridge, Massachusetts, pp. 438–483.
Cartwright DE and Longuet-Higgins MS (1956), “The Statistical Distribution of the Maxima of a Random Function”, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 237(1209): 212–232.
Eurocode 8 (2004), Design of Structures for Earthquake Resistance — Part 1: General Rules, Seismic Actions and Rules for Buildings.
Fajfar P, Vidic T and Fischinger M (1990), “A Measure of Earthquake Motion Capacity to Damage mediumperiod Structures,” Soil Dynamics and Earthquake Engineering, 9(5): 236–242.
Ganas A, Grecu B, Batsi E and Radulian M (2010), “Vrancea Slab Earthquakes Triggered by Static Stress Transfer,” Natural Hazards and Earth Systems Sciences, 10: 2565–2577.
Gazetas G (2012), “Some Presumptions on the Nature of Base Excitation May Erroneously Affect the Response of Strongly Inelastic Systems,” Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal, Keynote & invited lecture.
Kramer S (1996), Geotechnical Earthquake Engineering, Prentice-Hall, Upper Saddle River, New Jersey 07458.
Lang D, Molina-Palacios S, Lindholm C and Balan S (2012), “Deterministic Earthquake Damage and Loss Assessment for the City of Bucharest, Romania,” Journal of Seismology, 16: 67–88.
Lungu D, Cornea T, Aldea A and Zaicenco A (1997), “Basic Representation of Seismic Action” in Lungu D, Mazzolani F and Savidis S, eds, Design of Structures in Seismic Zones: Eurocode 8 — Worked Examples. (TEMPUS PHARE CM Project 01198: Implementiong of structural Eurocodes in Romanian Civil Engineering standards) Bridgeman Ltd., Timisoara, Romania, pp. 1–60.
Lungu D, Demetriu S and Cornea T (1992), “Frequency bandwidth of Vrancea Earthquakes and the 1991 Edition of Seismic Code in Romania,” Proceedings of the 10th World Conference on Earthquake Engineering, Madrid, Spain, 10: 5633–5638.
Lungu D, Vacareanu R, Aldea A and Arion C (2000), Advanced Structural analysis, Conspress, Bucharest.
Maniatakis C and Spyrakos C (2012), “A New Methodology to Determine Elastic Displacement Spectra in the Near-fault Region,” Soil Dynamics and Earthquake Engineering, 35: 41–58.
Martinez-Pereira A and Bommer J (1998), “What is the Near-field?”, In: E Booth, ed., Seismic Design Practice into the Next Century, Balkema, Rotterdam, pp. 245–252.
Newmark N and Hall WJ (1969), “Seismic Design Criteria for Nuclear Reactor Facilities,” Proceedings of the 4th World Conference on Earthquake Engineering, Santiago de Chile, Chile, 2: B5.1–12.
Newmark N and Hall WJ (1982), “Earthquake Spectra and Design,” Earthquake Engineering Research Institute, Berkeley, California.
P100-1/2006 (2006): Code for Seismic Design — Part I — Design Prescriptions for Buildings, Ministry of Transports, Constructions and Tourism.
Pavel F (2012), “The Effects of the Intensity and of the Frequency Contents of Seismic Motions on the Nonlinear Structural Response,” PhD thesis, Technical University of Civil Engineering Bucharest (in Romanian).
Pavel F, Aldea A and Vacareanu R (2013a), “Near-field Strong Ground Motion Records from Vrancea Earthquakes,” Proceedings of the International Conference on Earthquake Engineering SE-50EEE, Skopje, Macedonia, Paper No. 190.
Pavel F and Lungu D (2012), “Frequency Content Indicators of Strong Ground Motions,” Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal. Paper no. 2372.
Pavel F, Vacareanu R, Aldea A and Arion C (2013b), “Source Effects on the Spectral Characteristics of Ground Motions Recorded in Bucharest Area during Vrancea Earthquakes of 1986 and 1990,” Journal of Earthquake Engineering, 17(8): 1192–1211.
Pomonis A, Coburn A and Ledbetter S (1990), “The Vrancea, Romania Earthquakes of 30–31 May 1990 — A Field Report by E.E.F.I.T.,” E.E.F.I.T., London, U.K.
Rathje E, Abrahamson N and Bray J (1998), “Simplified Frequency Content Estimates of Earthquake Ground Motions,” Journal of Geotechnical and Geoenvironmental Engineering, 124(2): 150–159.
Shabestari K and Yamazaki F (2001), “A Proposal of Instrumental Seismic Intensity Scale Compatible with MMI Evaluated from Three-component Acceleration Records,” Earthquake Spectra, 17(4): 711–723.
Shake Map Atlas, http://earthquake.usgs.gov/earthquakes/shakemap/atlas.php.
Sokolov V, Boese M and Wenzel F (2008), “Shakemap Methodology Based on Fourier Amplitude Spectra and Its Application for the Case of Vrancea Earthquakes in Romania,” Proceedings of the 14th World Conference on Earthquake Engineering, Beijing, China.
Vanmarcke EH (1976), “Structural Response to Earthquakes,” In C Lomnitz, E Rosenblueth, eds, Seismic Risk and Engineering Decisions, Elsevier, Amsterdam, pp. 287–338.
Xu L, Shengchao Y and Xie L (2010), “Response Spectra for Nuclear Structures on Rock Sites Considering Near-Fault Directivity Effect,” Earthquake Engineering and Engineering Vibrations, 9(2): 357–365.
Xu L and Xie L (2004), “Bi-normalized Response Spectral Characteristics of the 1999 Chi-Chi earthquake,” Earthquake Engineering and Engineering Vibrations, 3(2): 147–155.
Xu L and Xie L (2007), “Near-fault Ground Motion Bi-normalized Pseudo-velocity Spectra and Its Applications,” Acta Seismologica Sinica, 20(5): 544–552.
Ziotopoulou A and Gazetas G (2010), “Are Current Design Spectra Sufficient for Soil-structure Systems on Soft Soils?” In: M Fardis, ed., Advances in Performancebased Earthquake Engineering, Springer, pp. 79–87.
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Pavel, F., Vacareanu, R., Neagu, C. et al. Bi-normalized response spectra and seismic intensity in Bucharest for 1986 and 1990 Vrancea seismic events. Earthq. Eng. Eng. Vib. 13, 125–135 (2014). https://doi.org/10.1007/s11803-014-0217-1
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DOI: https://doi.org/10.1007/s11803-014-0217-1