Evaluation of building dynamic properties through in situ experimental techniques and 1D modeling: The example of Catania, Italy

Panzera, Francesco; Lombardo, Giuseppe; Muzzetta, I.

doi:10.1016/j.pce.2013.04.008

Cited by 21 publications

(16 citation statements)

References 25 publications

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“…Mucciarelli 1998;Rodriguez and Midorikawa 2002;Maresca et al 2003) have questioned the existence of simple direct correlation between HVNR spectral amplitude values and the site amplification. The HVNR from ambient vibrations are sometimes ''non-informative'', particularly in the case of significant lateral heterogeneity giving rise to 2D/3D effects and velocity inversion that influence the vertical component of motion (Di Giacomo et al 2005;Castellaro and Mulargia 2009;Panzera et al 2013). Indeed, when a velocity inversion takes place, the estimate of the mean value of shear wave velocity over the first 30 m (V S,30 ), which is used to classify soils into a small number of classes (Eurocode8 2003), undergoes relevant limitations (Di Giacomo et al 2005;Panzera et al 2013).…”

Section: Forewordsmentioning

confidence: 99%

“…The HVNR from ambient vibrations are sometimes ''non-informative'', particularly in the case of significant lateral heterogeneity giving rise to 2D/3D effects and velocity inversion that influence the vertical component of motion (Di Giacomo et al 2005;Castellaro and Mulargia 2009;Panzera et al 2013). Indeed, when a velocity inversion takes place, the estimate of the mean value of shear wave velocity over the first 30 m (V S,30 ), which is used to classify soils into a small number of classes (Eurocode8 2003), undergoes relevant limitations (Di Giacomo et al 2005;Panzera et al 2013). For this reason, an alternative to V S,30 -based classes was recently proposed (Zhao et al 2006;Di Alessandro et al 2012) and founded only on the site predominant period inferred from HVSR.…”

Section: Forewordsmentioning

confidence: 99%

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Seismic site effects observed on sediments and basaltic lavas outcropping in a test site of Catania, Italy

et al. 2015

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Ambient noise measurements and a set of 44 moderate magnitude earthquakes were used to study the role of local geology and morphology on the site response of a small hill in the northern part of Catania, on top of which the University Astronomical Observatory is located. The study area has a gentle topography with a flat surface at the top, and it is characterized by a complex sedimentary sequence lying between a clayey basement and an upper volcanic formation. The recorded data were processed through standard spectral ratio and horizontal-to-vertical spectral ratio techniques. Directional effects were also investigated by computing the spectral ratios after rotating the horizontal components of motion and performing polarization analysis. Results of noise and earthquakes analysis, although showing significant differences in amplitude, are comparable in frequency, especially in the sedimentary terrains. On the lava flows, spectral ratios show significant amplification of the vertical component, which appear related to a higher P velocity contrast with underlying soft sediments. Directional effects were identified in two frequency bands (0.2-0.4 and 1.0-10.0 Hz). The effects observed at the lower frequency interval are rather stable, and it spreads out in all the studied area. At higher frequencies, directional effects are variable and mostly observed on the slopes rather than at the hill top. Our findings appear linked to the complex wave field generated by the lithologic heterogeneities existing in the area which seem to be related to the alternation of sediments and basaltic lavas.

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Section: Forewordsmentioning

confidence: 99%

Section: Forewordsmentioning

confidence: 99%

Seismic site effects observed on sediments and basaltic lavas outcropping in a test site of Catania, Italy

et al. 2015

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“…The comparison between building and site frequencies was then used as a tool to put into evidence the potential presence of resonance between site and structure during a seismic event. It has to be remembered that the presence of lava flows at the surface could imply the existence of possible velocity inversions with the underlying soft sediments, which could give rise to a HVSR amplitude lower than one unit [51][52][53]. Panzera et al [44] tested the influence of lava thickness on the HVSR amplitude, in the frequency range 1.0-10.0 Hz.…”

Section: Ambient Vibration Measurementsmentioning

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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“…Etna by adopting the commonly used horizontal to vertical spectral ratio techniques that evaluate the site response properties using both earthquake (HVSR) and ambient noise (HVNR) as input signals (Nogoshi and Igarashi, 1971;Nakamura, 1989;Lermo and Chavez-Garcia, 1993). Although these methodologies are commonly applied in areas showing strong impedance contrast or minor lateral heterogeneities, they have been widely applied with valuable results in volcanic areas characterized by a complex geologic setting (e.g., Lombardo et al, 2006;Panzera et al, 2013Panzera et al, , 2016Panzera et al, , 2017Rahpeyma et al, 2016).…”

Section: Accounting For Site-specific Responsementioning

confidence: 99%

When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy – Part 2: Computational implementation and first results

Peruzza

Azzaro

Gee

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper describes the model implementation and presents results of a probabilistic seismic hazard assessment (PSHA) for the Mt. Etna volcanic region in Sicily, Italy, considering local volcano-tectonic earthquakes. Working in a volcanic region presents new challenges not typically faced in standard PSHA, which are broadly due to the nature of the local volcano-tectonic earthquakes, the cone shape of the volcano and the attenuation properties of seismic waves in the volcanic region. These have been accounted for through the development of a seismic source model that integrates data from different disciplines (historical and instrumental earthquake datasets, tectonic data, etc.; presented in Part 1, by Azzaro et al., 2017) and through the development and software implementation of original tools for the computation, such as a new ground-motion prediction equation and magnitude-scaling relationship specifically derived for this volcanic area, and the capability to account for the surficial topography in the hazard calculation, which influences source-to-site distances. Hazard calculations have been carried out after updating the most recent releases of two widely used PSHA software packages (CRISIS, as in Ordaz et al., 2013; the OpenQuake engine, as in Pagani et al., 2014). Results are computed for short-to mid-term exposure times (10% probability of exceedance in 5 and 30 years, Poisson and time dependent) and spectral amplitudes of engineering interest. A preliminary exploration of the impact of sitespecific response is also presented for the densely inhabited Etna's eastern flank, and the change in expected ground motion is finally commented on. These results do not account for M > 6 regional seismogenic sources which control the hazard at long return periods. However, by focusing on the impact of M < 6 local volcano-tectonic earthquakes, which dominate the hazard at the short-to mid-term exposure times considered in this study, we present a different viewpoint that, in our opinion, is relevant for retrofitting the existing buildings and for driving impending interventions of risk reduction.

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Evaluation of building dynamic properties through in situ experimental techniques and 1D modeling: The example of Catania, Italy

Cited by 21 publications

References 25 publications

Seismic site effects observed on sediments and basaltic lavas outcropping in a test site of Catania, Italy

Seismic site effects observed on sediments and basaltic lavas outcropping in a test site of Catania, Italy

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

When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy – Part 2: Computational implementation and first results

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