Analytical versus observational fragilities: the case of Pettino (L’Aquila) damage data database

Luca, Flavia De; Verderame, Gerardo Mario; Manfredi, Gaetano

doi:10.1007/s10518-014-9658-1

Cited by 36 publications

(26 citation statements)

References 29 publications

(56 reference statements)

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“…The seismic intensity in this study is characterized by PGA derived from the ShakeMap (Michelini et al 2008) for L'Aquila's main event. De Luca et al (2015) and Del Gaudio et al (2016) derived empirical fragility curves based on a database of post-earthquake building surveys conducted on 131 RC buildings located in the town of Pettino after the 2009 L'Aquila Earthquake. The EMS-98 compatible damage levels were deducted from the standard Italian survey sheet AeDES (Baggio et al 2007) and seismic intensity was expressed in terms of PGA contours of the L'Aquila main event ShakeMap.…”

Section: A Brief History Of Empirical Fragility Assessment For Buildimentioning

confidence: 99%

Empirical fragility assessment using conditional GMPE-based ground shaking fields: application to damage data for 2016 Amatrice Earthquake

Miano

Jalayer

Forte

et al. 2020

Bull Earthquake Eng

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Recent earthquakes have exposed the vulnerability of existing buildings; this is demonstrated by damage incurred after moderate-to-high magnitude earthquakes. This stresses the need to exploit available data from different sources to develop reliable seismic risk components. As far as it regards empirical fragility assessment, accurate estimation of ground-shaking at the location of buildings of interest is as crucial as the accurate evaluation of observed damage for these buildings. This implies that explicit consideration of the uncertainties in the prediction of ground shaking leads to more robust empirical fragility curves. In such context, the simulation-based methods can be employed to provide fragility estimates that integrate over the space of plausible ground-shaking fields. These ground-shaking fields are generated according to the joint probability distribution of ground-shaking at the location of the buildings of interest considering the spatial correlation structure in the ground motion prediction residuals and updated based on the registered ground shaking data and observed damage. As an alternative to the embedded coefficients in the ground motion prediction equations accounting for subsoil categories, stratigraphic coefficients can be applied directly to the ground motion fields at the engineering bedrock level. Empirical fragility curves obtained using the observed damage in the aftermath of Amatrice Earthquake for residential masonry buildings show that explicit consideration of the uncertainty in the prediction of ground-shaking significantly affects the results.

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Section: A Brief History Of Empirical Fragility Assessment For Buildimentioning

confidence: 99%

Empirical fragility assessment using conditional GMPE-based ground shaking fields: application to damage data for 2016 Amatrice Earthquake

Miano

Jalayer

Forte

et al. 2020

Bull Earthquake Eng

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“…Statistics about geometrical, typological and morphological characteristics, as well as for what concerning the damage of the buildings object of this study. The 131 buildings selected are all regular in plan and elevation and fully infilled according to data reported in post-earthquake inspection forms by Italian National Civil Protection (Polidoro [11], De Luca et al [4]).…”

Section: Damage Databasementioning

confidence: 99%

“…Seismic fragility evaluated on horizontal soil type B is used. Indeed soil type of a station of the National Accelerometric Network (Rete Accelerometrica Nazionale, RAN) in the area was classified according to cross-hole test results as type B, see (De Luca et al [4], Chioccarelli et al [3]) for more details.…”

Section: Comparison Between Observed and Predicted Earthquake Damage mentioning

confidence: 99%

Observed and predicted earthquake damage scenarios: the case study of L’Aquila municipality

Gaudio

Ricci

Verderame

2015

WIT Transactions on the Built Environment

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A simplified analytical method for the seismic vulnerability assessment of reinforced concrete buildings on a large scale is presented. The approach followed is based on the capacity spectrum method (CSM) to evaluate seismic capacity and approximate IDA curves to define PGA capacity starting from damage states' characteristic displacement capacity for structural and non-structural elements. Damage states are defined according to the observational-based damage states provided by the European Macroseismic Scale EMS-98. A database consisting of 131 reinforced concrete buildings located at the Municipality of L'Aquila is presented, which after the earthquake of 2009 have been charged to post-earthquake usability assessment procedure. The specific interpretation of damage data allowed carrying out fragility curves for slight, moderate, and heavy damage, (i.e., DS1, DS2, and DS3), defined according to EMS 98 macroseismic scale. The damage scenario deriving from the application of such a procedure is compared with that collected from the post-earthquake usability assessment procedure.

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“…In the past, extensive damage observed on structures located in NF regions has been associated to pulse-like ground motions. Examples include events such as the 1999 M7.6 Chi-Chi earthquake (Shin and Teng 2001), the 1994 M6.7 Northridge earthquake (Jones et al 1994), and most recently, the 2009 M6.3 L'Aquila (De Luca et al 2015), and the 2011 M6.1 Christchurch (Bannister and Gledhill 2012) earthquakes. The distinct features of these ground motions and their (potentially) devasting impact on structures have boosted various studies addressing the effects of pulse-like ground motions both on the seismic demands and the capacity of various structural systems; a comprehensive overview of these past research is outside the scope of this paper, but some key findings are briefly reviewed here.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

Accounting for directivity-induced pulse-like ground motions in building portfolio loss assessment

Gentile

Galasso

2020

Bull Earthquake Eng

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Earthquake-induced pulse-like ground motions are often observed in near-source conditions due to forward-directivity. Recent worldwide earthquakes have emphasised the severe damage potential of such pulse-like ground motions. This paper introduces a framework to quantify the impact of directivity-induced pulse-like ground motions on the direct economic losses of building portfolios. To this aim, a simulation-based probabilistic risk modelling framework is implemented for various synthetic building portfolios located either in the fault-parallel or fault-normal orientations with respect to a case-study strike–slip fault. Three low-to-mid-rise building typologies representative of distinct vulnerability classes in the Mediterranean region are considered: non-ductile moment-resisting reinforced concrete (RC) frames with masonry infills, mainly designed to only sustain gravity loads (i.e. pre-code frames); moment-resisting RC infilled frames designed considering seismic provisions for high ductility capacity (i.e. special-code frames); special-code steel moment-resisting frames. Monte Carlo-based probabilistic seismic hazard analysis is first performed, considering the relevant modifications to account for the pulse-occurrence probability and the resulting spectral amplification. Hazard curves for sites/buildings located at different distances from the fault are obtained, discussing the spatial distribution of the hazard amplification. A set of pulse-like ground motions and a set of one-to-one spectrally-equivalent ordinary records are used to perform non-linear dynamic analysis and derive fragility relationships for each considered building typology. A vulnerability model is finally built by combining the derived fragility relationships with a (building-level) damage-to-loss model. The results are presented in terms of intensity-based and expected annual loss for synthetic portfolios of different sizes and distribution of building types. It is shown that, for particularly short-period structures (e.g. infilled RC frames), the influence of near-source directivity can be reasonably neglected in the fragility derivation while kept in place in the hazard component. Overall, near-source directivity effects are significant when estimating losses of individual buildings or small portfolios located very close to a fault. Nevertheless, the impact of pulse-like ground motions on losses for larger portfolios can be considered minimal and can be neglected in most of the practical large-scale seismic risk assessment applications.

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Analytical versus observational fragilities: the case of Pettino (L’Aquila) damage data database

Abstract: A damage data database of 131 reinforced concrete (RC)

Cited by 36 publications

References 29 publications

Empirical fragility assessment using conditional GMPE-based ground shaking fields: application to damage data for 2016 Amatrice Earthquake

Empirical fragility assessment using conditional GMPE-based ground shaking fields: application to damage data for 2016 Amatrice Earthquake

Observed and predicted earthquake damage scenarios: the case study of L’Aquila municipality

Accounting for directivity-induced pulse-like ground motions in building portfolio loss assessment

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