Buildings as a Seismic Source: Analysis of a Release Test at Bagnoli, Italy

Gallipoli, Maria Rosaria; Mucciarelli, Marco; Ponzo, Felice Carlo; Dolce, Mauro; D’Alema, Ezio; Maistrello, M.

doi:10.1785/0120060015

Cited by 24 publications

(16 citation statements)

References 13 publications

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“…If the reference site is located outside the building on the foundation soil, but very close to the building, its vibrations could influence the recordings. This effect increases if the building frequency is in the same range of the soil frequency [11,12,32,33].…”

Section: Methodologiesmentioning

confidence: 99%

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Empirical estimate of fundamental frequencies and damping for Italian buildings

Gallipoli

Mucciarelli

Vona

2008

Earthq Engng Struct Dyn

110

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SUMMARYThe aim of this work is to estimate the fundamental translational frequencies and relative damping of a large number of existing buildings, performing ambient vibration measurements. The first part of the work is devoted to the comparison of the results obtained with microtremor measurements with those obtained from earthquake recordings using four different techniques: horizontal-to-vertical spectral ratio, standard spectral ratio, non-parametric damping analysis (NonPaDAn) and half bandwidth method. We recorded local earthquakes on a five floors reinforced concrete building with a pair of accelerometers located on the ground and on top floor, and then collected microtremors at the same location of the accelerometers. The agreement between the results obtained with microtremors and earthquakes has encouraged extending ambient noise measurements to a large number of buildings. We analysed the data with the abovementioned methods to obtain the two main translational frequencies in orthogonal directions and their relative damping for 80 buildings in the urban areas of Potenza and Senigallia (Italy). The frequencies determined with different techniques are in good agreement. We do not have the same satisfactory results for the estimates of damping: the NonPaDAn provides estimates that are less dispersed and grouped around values that appear to be more realistic. Finally, we have compared the measured frequencies with other experimental results and theoretical models. Our results confirm, as reported by previous authors, that the theoretical period-height relationships overestimate the experimental data.

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Section: Methodologiesmentioning

confidence: 99%

“…[11,12]), but again these detailed approaches can be used only for a limited number of selected buildings. Hans et al [13] demonstrated that impacts, forced vibration and ambient noise yield the same values for fundamental periods of building in Lyon, France.…”

Section: Introductionmentioning

confidence: 99%

Empirical estimate of fundamental frequencies and damping for Italian buildings

Gallipoli

Mucciarelli

Vona

2008

Earthq Engng Struct Dyn

110

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“…The radiated energy is visible also in the vertical component because the building-radiated wave field is a mix of body and Rayleigh waves (Guèguen et al, 2000, Mucciarelli et al, 2003Gallipoli et al, 2006).…”

Section: Building-soil Interactionmentioning

confidence: 99%

“…et al, 2004;Cornou C. et al, 2004), or snap-back test on both models (Guéguen. et al, 2002) and real buildings (Mucciarelli et al, 2003;Gallipoli et al, 2006;Ditommaso et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Monitoring the response and the back-radiated energy of a building subjected to ambient vibration and impulsive action: the Falkenhof Tower (Potsdam, Germany)

Ditommaso

Parolai

Mucciarelli

et al. 2009

Bull Earthquake Eng

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The response of the soil-structure system near the Falkenhof Tower, Potsdam, Germany, has been monitored during the controlled explosion of a bomb dating to World War II. We installed eight 3-component velocimetric stations within the building and three in the surrounding area. We recorded several hours of seismic noise before and after the explosion, allowing the dynamic characterization of the structure both with ambient noise and forced vibration. We then compared the frequencies values and modal shapes of the structural modes evaluated both by analysing in the frequency domain the transfer functions and in the time-domain the different signals.Moreover, we carried out an interferometric analysis of the recorded signals in order to study the structural behaviour and to characterize the soil-structure interaction.Furthermore, we used normalized Short Time Fourier Transform (STFT) for the continuous monitoring of the structural response, in order to highlight possible frequency variations of the structural mode of vibration, and therefore of the structure's behaviour.To assess structural frequencies and to compare them with those evaluated by transfer functions, we used azimuth-dependent Fourier spectra. We also verified the suitability of the Horizontal-to-Vertical Spectral Ratio (HVSR) for estimating the dynamic characteristics of buildings when only single station seismic noise measurements are available.Regarding the structure-soil interaction, we identified the presence of a wave field back-radiated from the structure within the low amplitude seismic noise signal. In fact, in the free-field seismic noise recording spectra, peaks at frequencies consistent with those of the first two modes of the structure were recognized.

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“…In addition, the spectral ratios between the ambient vibrations Fourier spectra of horizontal components (HHSR), which are evaluated at the base and the different building levels, were used to determine the dynamical properties of this structure. These kinds of studies are important in investigating the possible soil-structure resonance effects that can arise when the fundamental frequency of a building shares the same range as that observed in the foundation soil [33][34][35]. …”

Section: Introductionmentioning

confidence: 99%

Ambient Vibrations Measurements and 1D Site Response Modelling as a Tool for Soil and Building Properties Investigation

et al. 2018

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Abstract:The safety of historic buildings heritage is an important task that becomes more substantial when it is directed to educational purposes. The present study aims at evaluating the dynamic features of the Benedettini complex, a historic monastery located in downtown Catania, which is at present the headquarters of the humanistic studies department of the University of Catania. Both the building's complex response to a seismic input and the soil-structure interaction were investigated using ambient noise recordings. The results point out a multiple dynamic behaviour of the monastery structure that shows several oscillation modes, whereas the identification of a single natural frequency can be observed in some sites where the structure can more freely oscillate. This observation is also confirmed by the variability of computed damping values that appear linked to the different rigidity of the structure, as a function of the either the longitudinal or transversal orientation of the investigated structural elements. Moreover, the comparison between the building's fundamental period and spectral ratios frequencies, which were obtained from free field ambient noise measurements located outside the monastery, outline the presence of potential resonance effects between the site and structure during a seismic event. Numerical modelling of the local seismic response confirms the obtained experimental site frequencies, setting into evidence that higher amplification factors are reached in the same frequency range characterizing the building.

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Buildings as a Seismic Source: Analysis of a Release Test at Bagnoli, Italy

Cited by 24 publications

References 13 publications

Empirical estimate of fundamental frequencies and damping for Italian buildings

Empirical estimate of fundamental frequencies and damping for Italian buildings

Monitoring the response and the back-radiated energy of a building subjected to ambient vibration and impulsive action: the Falkenhof Tower (Potsdam, Germany)

Ambient Vibrations Measurements and 1D Site Response Modelling as a Tool for Soil and Building Properties Investigation

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