Fragility curves for the seismic assessment of masonry buildings in historic centres prone to out-of-plane failure modes

Cima, Valentina; Tomei, Valentina; Grande, Ernesto; Imbimbo, Maura

doi:10.1007/s10518-023-01831-7

Cited by 5 publications

(8 citation statements)

References 53 publications

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“…Nonlinear kinematic analysis is the most suggested approach for the seismic assessment of masonry structures toward out-of-plane mechanisms (Degli Abbati et al, 2014;Simões et al, 2014;Cattari et al, 2015;Casapulla et al, 2021;Cima et al, 2022Cima et al, , 2023. The application of this approach requires particular attention to the definition of the performance levels which are strictly related to the level of expected damage (Lagomarsino & Cattari, 2015).…”

Section: Kinematic Analysis For Out-of-plane Mechanismsmentioning

confidence: 99%

Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

Cima,

Grande,

Lirer

2024

Preprint

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Medieval defensive walls are a distinctive feature of Italian cultural heritage. These structures testify the origins of historical centres and, in some cases, the consequences of the events occurred over time. The typical configuration of medieval defensive walls, generally characterized by high slenderness ratios, out-of-plumb, the absence od deep and adequate foundations, made these elements particularly vulnerable toward seismic actions. This study focused on the assessment of the seismic safety of Italian medieval defensive walls toward out-of-plane failure mechanisms induced by seismic actions. To this end, a simple approach based on the use of generalized dimensionless capacity curves is presented. These curves, derived by the Authors from a calibration process involving a set of selected real cases, allows for a rapid preliminary seismic assessment of masonry walls particularly useful for getting an initial idea of the condition of the walls with respect to seismic actions also considering the presence of pre-existing out-of-plumb configurations. The proposed approach has been applied in the paper to the real case study of medieval walls of Cittadella, a town in northern Italy, considering the pre-existing out-of-plumb configuration. The obtained results have shown the vulnerability of these walls in case of occurrence of masonry disaggregation and, consequently, the importance of performing specific surveys finalized to investigate this phenomenon. The application of the proposed approach has clearly shown its feasibility and usefulness for the seismic evaluation. Moreover, the comparison with the corresponding results obtained by using the actual capacity curves, rather than the generalized ones, has underlined its good level of reliability.

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Section: Kinematic Analysis For Out-of-plane Mechanismsmentioning

confidence: 99%

Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

Cima,

Grande,

Lirer

2024

Preprint

Self Cite

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“…The proposed approach, similarly to that developed by the authors in their previous works [45,47] and referring to isolated buildings, follows the multi-step procedure outlined in Figure 7. Each step is described in detail, providing specific evidence of the contribution of the aggregate effect.…”

Section: Fragility Curves For Urm Buildings Considering the Aggregate...mentioning

confidence: 99%

“…Figure 12 shows the typical buildings representative of the two typologies. For a more detailed characterization, refer to [45].…”

Section: Case Studymentioning

confidence: 99%

“…The present paper aims to introduce the aggregate effect in the derivation of fragility curves for URM buildings in aggregate configuration prone to out-of-plane overturning mechanisms of their façade walls. In particular, this study proposes a new approach that, starting from a previous proposal of the authors [45][46][47], specifically takes into account the aggregate effect. This is achieved by considering, in the analysis of the mechanisms, the different friction actions that may occur at the intersections between the façade wall of the building under consideration and the walls of the adjacent buildings.…”

Section: Introductionmentioning

confidence: 99%

“…The derived total dispersion incorporating both the model variability [69] and the record-to-record variability. The latter is estimated using the 84th and the 16th percentiles of the selected spectra [45,70].…”

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The Influence of the Aggregate Configuration on the Seismic Assessment of Unreinforced Masonry Buildings in Historic Urban Areas

Cima,

Tomei,

Grande

et al. 2024

Sustainability

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Unreinforced masonry (URM) buildings in historic urban areas of European countries are generally clustered in an aggregate configuration and are often characterized by façade walls mutually interconnected with adjacent ones. As a result, the seismic performance of buildings in an aggregate configuration can be affected by the mutual interaction between the adjacent units. This interaction, often called the aggregate effect, could significantly influence the level of the seismic vulnerability of URM buildings in aggregate configuration toward in-plane and out-of-plane mechanisms, the latter being the object of the present paper. Traditional methods for assessing the seismic vulnerability of URM buildings neglect the interactions between adjacent buildings, potentially underestimating the actual vulnerability. This study aims to derive fragility curves specific for UMR buildings in aggregate configuration and proposes an innovative methodology that introduces the aggregate effect into an analytical approach, previously developed by the authors for isolated URM buildings. The aggregate effect is modeled by accounting for the friction forces arising among adjacent facades during the development of out-of-plane overturning mechanisms by considering different scenarios, based on how façade walls interact with neighboring structures (e.g., whether they are connected to transverse and/or lateral coplanar ones). The proposed approach is applied to a real case study of an Italian historical center. The obtained results demonstrate that the aggregate effect significantly influences the fragility curves of URM buildings arranged in aggregate configurations. This highlights the importance of considering this effect and the usefulness of the proposed approach for large-scale assessments of seismic vulnerability in historic urban areas, contributing to sustainable disaster risk prevention.

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Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

Cima,

Grande,

Lirer

2024

Bull Earthquake Eng

View full text Add to dashboard Cite

Fragility curves for the seismic assessment of masonry buildings in historic centres prone to out-of-plane failure modes

Cited by 5 publications

References 53 publications

Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

The Influence of the Aggregate Configuration on the Seismic Assessment of Unreinforced Masonry Buildings in Historic Urban Areas

Proposal for an expeditious seismic vulnerability evaluation of the Italian medieval defensive walls

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