Empirical fragility functions and loss curves for Italian business facilities based on the 2012 Emilia-Romagna earthquake official database

Rossi, Leonardo; Stupazzini, Marco; Parisi, Davide; Holtschoppen, Britta; Ruggieri, Gabriella; Butenweg, Christoph

doi:10.1007/s10518-019-00759-1

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…As far as the seismic fragility of precast RC buildings is concerned, several recent studies proposed models using either observational damage data (Buratti et al 2017;Ongaretto et al 2019;Rossi et al 2020) or the results of numerical simulations (Casotto et al 2015;Babic et al 2016). Fragility models are used in several types of probabilistic analyses, such as loss, damage, and risk assessment (Ramirez and Miranda 2009;FEMA 2018), which can be performed with different levels of detail, spanning from small-scale analyses on single building, to large-scale assessments at regional or national level.…”

Section: Introductionmentioning

confidence: 99%

Large-scale seismic damage scenario assessment of precast buildings after the May 2012 Emilia earthquake

Praticò

Bovo

Buratti

et al. 2022

Bull Earthquake Eng

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In May 2012, two strong earthquakes hit the northern Italy revealing the significant seismic vulnerability of precast reinforced concrete structures and causing severe damage and many collapses, and high economic losses. After the lesson learnt from these events, more reliable seismic design criteria have been established for the design of new structures and different approaches have been proposed for the seismic assessment of the existing structures. In this context, the paper presents the results of a first application of the PRESSAFE-disp method, recently proposed by the authors, allowing to define the fragility curves of precast RC buildings at various limit states, including collapse. A stock of 91 precast buildings in the industrial area of San Felice sul Panaro (Modena) was selected as a benchmark case study to verify the reliability of the method in assessing seismic damage scenarios. In particular, with reference to the 2012 seismic ground-motion, two large-scale stochastic models are outlined to predict the number of the buildings collapsed in the area. The first one is based on a Monte Carlo simulation which incorporates the evaluation of the uncertainties, while the second one is a direct simplified calculation. Comparative considerations on the outcomes of the two methods for different seismic intensities are discussed, including the directionality effect of the ground-motion. To test the soundness of the simulations, the results of the two methods are compared with the real data collected through in-situ surveys. The procedures proposed here result, on average, in good agreement with the observed damage scenario. It is worth noting that, due to the inherent simplicity of the methods, they could be implemented to perform scenario-based seismic loss assessments to estimate the financial consequences of an earthquake affecting one or more industrial areas, and to drive the decision-making process for the seismic retrofit of existing precast RC buildings.

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Section: Introductionmentioning

confidence: 99%

Large-scale seismic damage scenario assessment of precast buildings after the May 2012 Emilia earthquake

Praticò

Bovo

Buratti

et al. 2022

Bull Earthquake Eng

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“…After Emilia earthquakes, the Italian Civil Protection Department prepared a summary (WG 2012) [5] of the main deficiencies of the precast industrial building structural performance. In this regard, it is worth also mentioning the study by Rossi et al [6] about longspan-beam structure, which proposed a damage characterization to construct empirical fragility functions, cost and loss ratio curves referring to precast RC industrial buildings.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Assessment of Isolation Seismic Device for Retrofit of Industrial Existing Shed

Mari¹,

Quaglini²,

Pettorruso³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Prefabricated industrial sheds featured a high seismic vulnerability during the 2012 Emilia earthquake (Italy). The buildings typically exhibited a rigid collapse mechanism that was a consequence of the lack of connection between columns, beams and roof elements. The study presents an experimental and numerical assessment of a novel isolation device which has been designed to improve the seismic performance of industrial sheds. The device, which is placed on the top of the column, exploits the movement of a rigid body on a sloped surface to provide horizontal stiffness and control the lateral displacement of the beam. Biaxial tests are performed to investigate the effect of the vertical load, the velocity of sliding and the number of cycles on the force -displacement response of the device. To cope with the capacity of the testing equipment, the experimental campaign is carried out on a scaled model of the device, and the protocol is designed accounting for similarity requirements. The backbone curve of the tested prototype is eventually derived from the experimental data. In the second part of the study, a 3D finite element model of the prototype is formulated in Abaqus and used to switch the backbone curve from the scaled model to the full-scale device. A parametric study is conducted to evaluate the influence of the inclination of the sloped surface and the coefficient of friction on the output force of the system.

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“…Given the high vulnerability of friction-based connections and the economic significance of prefabricated RC structures, many strengthening solutions have been proposed in the literature [6,8,17,18,19]. The reduction of damage and collapses due to seismic events for this type of structures, becomes even more strategical since a high economic impact due to industrial business interruption has to be taken in account, in addition to the direct economic losses [20,21,22]. All the strengthening solutions are typically based on the introduction of steel ties, plates, or cable restraints, to avoid sliding of the beams and therefore unseating failures.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

Praticò¹,

Pollini²,

Sonda³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The seismic vulnerability of existing precast RC buildings not designed against seismic actions is a well-known issue nowadays, as emerged from the aftermath of the seismic events that affected many productive areas in the Emilia region (north Italy) in 2012. This is a consequence of the lack of structural redundancy and the widespread adoption of friction-based connections, which can lead to collapses and significant damage to contents. Thus, the necessity of identifying suitable intervention strategies has been widely recognized by researchers, which proposed different retrofit techniques. One of the most diffused approaches is to introduce mechanical connectors between columns and roof elements, resulting in an increase of the base shear and the need to strengthen the columns. To prevent this phenomenon, dissipative devices based on Carbon-Wrapped Steel Tubes (CWST) are introduced herein for the retrofit of existing precast RC structures, aiming at reducing the forces transmitted to columns, and providing a suitable connection between columns and beams. To this regard, this paper discusses the seismic retrofit of an existing precast building equipped with CWSTs. Linear and non-linear time history analyses have been conducted on two different models of the structure, one with hinged beam-column connections, and on the one with CWSTs. The yielding and the ultimate rotations of the plastic hinges at the base of the columns as well as the cyclic shear resistance depending on the ductility demand on each element, are defined according to Eurocode 8 prescriptions. The paper discusses the effects of the introduction of the CWSTs in the connections in terms of forces and proposes equivalent behavior factor values for the two structures.

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Empirical fragility functions and loss curves for Italian business facilities based on the 2012 Emilia-Romagna earthquake official database

Cited by 12 publications

References 25 publications

Large-scale seismic damage scenario assessment of precast buildings after the May 2012 Emilia earthquake

Large-scale seismic damage scenario assessment of precast buildings after the May 2012 Emilia earthquake

Experimental and Numerical Assessment of Isolation Seismic Device for Retrofit of Industrial Existing Shed

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

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