Effect of a single vibrating building on free-field ground motion: numerical and experimental evidences
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The influence of vibrating buildings on the free-field ground motion could affect the earthquake recordings collected inside or nearby the buildings. Some evidences are known for large structures, but also small buildings could adversely affect the quality of the recordings. An example is given for a station of the Italian Accelerometric Network whose recordings show a clear mark of the frequency of the host building. To tackle this problem in a more general way, we performed numerical simulations whose first aim was to validate existing empirical evidence from a test site. Gallipoli et al. (Bull Seismol Soc Am 96:2457–2464, 2006) monitored a release test on a 2-storey R.C. building in Bagnoli (Italy), showing that a single vibrating building may affect the “free-field” motion with an influence that reaches 20% of peak ground acceleration. We re-analysed the data of that experiment following the Safak (Soil Dyn Earthq Eng 17:509–517, 1998) approach to building-soil motion, described as propagation of up- and down-going S-waves. The numerical model is a chain of single degree of freedom oscillators, whose dynamic behaviour depends on mass, stiffness and damping. The agreement between the synthetic and real data encouraged us to use this model to reproduce generalised structures as systems with a single degree of freedom. We run multiple tests varying the distance, between building and station, and the building-soil coupling, obtaining a statistical distribution of the influence of a single vibrating building on free-field ground motion taking into account the distance.
KeywordsSite-city interaction Free-field Ground motion Rotational HVSR Dynamic identification
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- Bard P-Y, Gueguen P, Wirgin A (1996) A note on the seismic wavefield radiated from large building structures into soft soils, In: Proceedings of the eleventh world conference on earthquake engineering, Acapulco, Mexico, paper no. 1838Google Scholar
- Ditommaso R, Gallipoli MR, Mucciarelli M, Ponzo FC (2007). Effect of vibrating building on “free-field” ground motion: from the Bagnoli experiment to many—buildings simulation. In: Proceedings of the 4th international conference on earthquake geotechnology engineering, paper no. 1388. Springer, ISBN 978-1-4020-5893-6, CD-Rom editionGoogle Scholar
- Ditommaso R, Parolai S, Mucciarelli M, Eggert S, Sobiesiak M, Zschau J (2009) Monitoring the response and the back-radiated energy of a building subjected to ambient vibration and impulsive action: the Falkenhof Tower (Potsdam Germany). Bull Earthq Eng (submitted to this issue)Google Scholar
- Jennings PC (1970) Distant motion from a building vibration test. Bull Seismol Soc Am 60: 2037–2043Google Scholar
- Laurenzano G, Priolo E, Gallipoli MR, Mucciarelli M, Ponzo FC (2009) Effect of vibrating buildings on free-field motion and on adjacent structures: the Bonefro (Italy) case history, submitted to Bull Seism Soc AmGoogle Scholar
- Massa M, Marzorati S, Ladina C, Lovati S (2009) Urban seismic stations: soil-structure interaction assessment by spectral ratio analyses. Bull Earthq Eng, (submitted)Google Scholar
- Mazzolani FM, Della Corte G, Faggiano B (2004) Seismic upgrading of RC buildings by means of advanced techniques: the ILVA-IDEM project. In: Proceedings of the 13th world conference on earthquake engineering, Vancouver, B.C., Canada, 1–6 Aug 2004, paper no. 2703, CD-Rom EditionGoogle Scholar
- Mucciarelli M, Ditommaso R, Gallipoli MR, Ponzo F (2008). Effect of building–building interaction on “Free-Field” ground motion. Increasing seismic safety by combining engineering technologies and seismological data. Springer, Heidelberg, pp 141–145, ISBN 978-1-4020-9196-4Google Scholar
- Wirgin A, Bard P-Y (1996) Effects of building on the duration and amplitude of ground motion in Mexico city. Bull Seismol Soc Am 86: 914–920Google Scholar
- Wong HL, Trifunac MD (1975) Two dimensional antiplane building-soil-building interaction for two or more buildings and for incident plane SH waves. Bull Seismol Soc Am 65: 1863–1865Google Scholar
- Working Group ITACA (2008). Data base of the Italian strong motion data: http://itaca.mi.ingv.it