Site effects and soil-foundation-structure interaction: derivation of fragility curves and comparison with Codes-conforming approaches for a masonry school

Brunelli, Andrea; Silva, Filomena de; Cattari, Serena

doi:10.1016/j.soildyn.2021.107125

Cited by 19 publications

(19 citation statements)

References 54 publications

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“…It is worth noting that soil-foundation-structure (SFS) interaction was neglected in this study, while in other works (e.g. Brunelli et al 2022b) it was highlighted that SFS interaction combined with site-effect can also have a potential bene cial effect with respect to the only site-effect in terms of fragility curve. Therefore, only for greater completeness, it is reported in Fig.…”

Section: Site Ampli Cation Effects On Both Global and Local Behaviourmentioning

confidence: 85%

“…In particular, a soil pro le representative of the central valley area corresponds to that under the Visso's school (see Figure 2), already in-depth studied by Brunelli et al (2021Brunelli et al ( , 2022b. The other soil pro le characterizes the historical center area (see Brunelli et al 2022a) and was characterized through two boreholes and a HVSR (Horizontal to Vertical Spectral Ratio) test (MZS3 2018).…”

Section: Topographic and Soil Stratigraphic Features Of Visso's Munic...mentioning

confidence: 99%

“…This pro le is made of clayey silt for the rst 4 m, overlaying a 11 m thick sandy gravel layer. The lack of exhaustive information about the soil stiffness necessitated the use of correlation functions between SPT data done for the Visso's School and the shear wave velocity (V S ) of each layer of soil pro le (see Brunelli et al 2021aBrunelli et al , 2022b. In particular, V S =162 m/s was obtained for the clayey silt soil and V S =337 m/s for gravel layer.…”

Section: Topographic and Soil Stratigraphic Features Of Visso's Munic...mentioning

confidence: 99%

“…In particular, the multiscale approach originally proposed in (Lagomarsino and Cattari 2015) and then further developed in (Sivori et al 2022, Brunelli et al 2022b) was adopted to assign a speci c damage level to the building compatible with the EMS98 scale (i.e. from DL1 to DL5).…”

Section: Global In-plane Responsementioning

confidence: 99%

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Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Angiolilli

Brunelli

Cattari

2022

Preprint

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Masonry buildings in aggregate are largely diffused within the existing Italian and European building stock, especially in historical centres. Their seismic evaluation represents a difficult and open task that has not been exhaustively investigated so far. The study proposes a procedure aimed at evaluating the potential impact of the combination of local mechanisms and site-amplification in terms of fragility curves on an existing masonry aggregate. The latter consists of five adjacent structural units mutually interacting with each other during seismic sequences. The aggregate is inspired by the unreinforced masonry (URM) built heritage of the historic centre of Visso struck by the Central Italy 2016/2017 earthquakes. It was proved to be negatively affected especially by the site-amplification phenomena. The in-plane (IP) response of URM buildings was simulated through nonlinear dynamic analyses performed on a 3D equivalent frame model of the structure, whereas out-of-plane (OOP) mechanisms were analysed by adopting the rigid-block assumption but assuming as seismic input the floor accelerations derived from the post-processing of data derived from the global 3D model. Also an innovative procedure considering the pounding effect to the global response of the building was presented. Two soil conditions were assumed with (freefield) and without (bedrock case) site amplification. In the first case, a site response analysis based on a 1D soil model aimed to reproduce the actual soil profile under the examined aggregate has been carried out. The results showed that site effects strongly affected the seismic vulnerability of the aggregate, also possibly altering the combination between IP and OOP mechanisms with respect to what expected on basis of evidence from other historical centres. More specifically, for bedrock condition, the overall seismic response of the buildings in aggregate was strongly affected by such a combination, especially for medium-high damage levels where local mechanisms were prevailing with respect to the IP response. Conversely, for freefield condition, IP mainly governed the overall behaviour for all the damage levels, consistently with the field evidence. The result appears also affected by the architectural configuration of such buildings, characterized by quite large openings at ground floor.

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Section: Site Ampli Cation Effects On Both Global and Local Behaviourmentioning

confidence: 85%

Section: Topographic and Soil Stratigraphic Features Of Visso's Munic...mentioning

confidence: 99%

Section: Topographic and Soil Stratigraphic Features Of Visso's Munic...mentioning

confidence: 99%

Section: Global In-plane Responsementioning

confidence: 99%

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Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Angiolilli

Brunelli

Cattari

2022

Preprint

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“…Site ampli cation is generally shown to have a negative impact, while SSI may play a bene cial role in the resulting fragility curves enhanced by soil hysteresis (Brunelli et al, 2022). Some literature efforts (Tomeo et al, 2018;Karapetrou et al, 2015) compared fragility curves obtained by employing the decoupled approach for xed-base structures subjected to free-eld motions and the results from the direct method.…”

Section: Introductionmentioning

confidence: 99%

Urban scale risk assessment including SSI and site amplification

Amendola

Pitilakis

2022

Preprint

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Large-scale risk analysis is typically performed considering existing fragility curves, calculated in most cases without adequately accounting for local site amplification (SA) and soil-structure interaction (SSI) effects. Nevertheless, foundation flexibility and local site effects may lead to a substantial margin of fragility or loss estimates, especially for structures resting on soft soil. Including these effects on the city-scale vulnerability analysis is challenging due to the entailed complexity of defining the whole interacting urban system. We propose a novel framework for the fragility assessment of structures considering the influence of SSI and local site amplification effects, suitable for large-scale applications. The applicability of the proposed approach is based on globally available data regarding the soil, the foundation, and the building portfolio. Site amplification is considered directly in the resulting fragility curves using site response analyses. An improved taxonomy is adopted to make the approach implementable in the OpenQuake software, introducing VS,30 as a proxy for the site and SSI effects. Finally, following the performance-based earthquake engineering framework, the outcomes of the methodological framework are adopted to estimate the nominal probability of failure for selected building classes belonging to the majority of structural types of the city of Thessaloniki, Northern Greece. The main findings demonstrate that the conventional way of calculating fragility curves may lead to an incorrect seismic risk evaluation, especially in soft soil formations.

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The Influence of Soil-Foundation-Structure Interaction on the Seismic Performance of Masonry Buildings

Silvestri

Silva²,

Parisi³

et al. 2022

Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 202

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Site effects and soil-foundation-structure interaction: derivation of fragility curves and comparison with Codes-conforming approaches for a masonry school

Cited by 19 publications

References 54 publications

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Fragility curves of masonry buildings in aggregate accounting for local mechanisms and site effects

Urban scale risk assessment including SSI and site amplification

The Influence of Soil-Foundation-Structure Interaction on the Seismic Performance of Masonry Buildings

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