Simulation of damage observed on buildings in aggregate after the 2016-2017 Central Italy earthquake accounting for site effects and soil-structure interaction

Brunelli, Andrea; Alleanza, G.A.; Cattari, Serena; Silva, Filomena de; d’Onofrio, A.

doi:10.1201/9781003308867-66

Cited by 3 publications

(7 citation statements)

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“…The consequent equivalent V S up to the bedrock depth is V Seq = 272 m/s. For the Visso's school area, there is substantially no discrepancy between the punctual 1D subsoil model and the more detailed 2D analysis, while the valley-effect has resulted to be bene cial for the historical center area as shown in (Brunelli et al 2022a). In the latter study, a validation of the numerical model adopted in this paper has been provided by comparing the actual damage with the simulated one.…”

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

confidence: 93%

“…The municipality of Visso is in a valley characterized by two main soil pro les and represents an interesting case for which a detailed study on the site and soil-foundation-structure interaction effects for the P.Capuzi school (see Figure 2) was already investigated in Brunelli et al (2021Brunelli et al ( , 2022a.…”

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

confidence: 99%

“…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). This pro le is made of clayey silt for the rst 4 m, overlaying a 11 m thick sandy gravel layer.…”

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

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

confidence: 93%

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%

See 1 more Smart Citation

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

Angiolilli

Brunelli

Cattari

2022

Preprint

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show abstract

“…A detailed study on the site and soil-foundation-structure interaction effects for the P.Capuzi school, very close to the investigated aggregate (see Fig. 2), was already investigated in Brunelli et al (2021Brunelli et al ( , 2022a.…”

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

confidence: 99%

“…2), already in-depth studied by Brunelli et al (2021Brunelli et al ( , 2022b. The other soil profile characterizing the historical center area (see Brunelli et al 2022a) was classified through two boreholes and a HVSR (Horizontal to Vertical Spectral Ratio) test (MZS3 2018). This profile is made of clayey silt for the first 4 m, overlaying a 11 m thick sandy gravel layer.…”

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

confidence: 99%

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

Angiolilli

Brunelli

Cattari

2023

Bull Earthquake Eng

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The seismic evaluation of masonry buildings in aggregate, largely diffused within the existing Italian and European building stock, 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 unreinforced masonry (URM) aggregate which is made of five adjacent structural units mutually interacting with each other during seismic sequences. The case study is inspired by built heritage of the historic centre of Visso struck by the Central Italy 2016/2017 earthquakes. 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. An innovative procedure considering the pounding effect to the global response of the building is also presented. Two soil conditions were assumed with (freefield) and without (bedrock) site amplification. The results showed that site effects strongly affected the seismic vulnerability of the aggregate, also altering the combination between IP and OOP mechanisms. In fact, for bedrock condition, especially for medium–high damage levels, 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.

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Definition and validation of a valley amplification factor for seismic linear response of 2D homogeneous alluvial basins

Alleanza,

d’Onofrio,

Silvestri

2024

Bull Earthquake Eng

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The paper presents findings from a parametric study analysing geometric (e.g., shape ratio, edge inclination) and stratigraphic factors (e.g. impedance ratio) influencing ground motion in trapezoidal valleys. The study involved 2160 visco-elastic analyses, considering 180 2D models with diverse shapes and soil properties, undergoing 12 synthetic input motions. Analyses results showed that the motion at the valley centre increases with both shape and impedance ratios, while it is independent of the edge slope; on the other hand, the maximum amplification at the edges depends on their inclination and on the impedance ratio, while it is independent of the valley shape. The position and size of the zone of maximum amplification at the edges depend on all the previous parameters. A valley amplification factor (VAF) is introduced to quantify spectral acceleration increase due to 2D effects. Closed-form equations are proposed to evaluate VAF based on valley properties. The proposed VAF is then applied to predict seismic amplification in two central Italian valleys, providing results well-comparable to those obtained from 2D numerical analyses. The described approach can be easily implemented into codes of practice as a conservative design tool to estimate 2D amplification along the surface of ‘shallow valleys’ subjected to moderate seismic actions.

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Simulation of damage observed on buildings in aggregate after the 2016-2017 Central Italy earthquake accounting for site effects and soil-structure interaction

Cited by 3 publications

References 0 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

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

Definition and validation of a valley amplification factor for seismic linear response of 2D homogeneous alluvial basins

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