A probabilistic simplified seismic model of masonry buildings based on ambient vibrations

Spina, Daniele; Acunzo, Gianluca; Fiorini, N.; Mori, Federico; Dolce, Mauro

doi:10.1007/s10518-018-0481-y

Cited by 20 publications

(24 citation statements)

References 23 publications

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“…The results of the validation carried out slightly underestimated the probability of closure due to the damage accumulated after the main shock. In order to evaluate the operational efficiency of the emergency management system identified by the LCE analysis through a network of nodes and arcs, it is therefore possible to associate for each node the fragility curve defined for the building (for example using the SMAV methodology [26,27]), and for each urban arc, the fragility curve constructed with the proposed methodology.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…If in a road network segment there are also other causes of mobility disruption related, for example, to the damage to bridges, retaining walls, etc., the relevant fragility curves can be assumed to work in series. This implies that the probability of opening (or closure) of the generic road segment is based on the product among the probabilities of opening (or closure) of the various fragility curves In order to evaluate the operational efficiency of the emergency management system identified by the LCE analysis through a network of nodes and arcs, it is therefore possible to associate for each node the fragility curve defined for the building (for example using the SMAV methodology [26,27]), and for each urban arc, the fragility curve constructed with the proposed methodology.…”

Section: Discussionmentioning

confidence: 99%

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Fragility Curves of the Urban Road Network Based on the Debris Distributions of Interfering Buildings

2020

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Fragility curves are essential tools to quantitatively assess the physical vulnerability of structures and infrastructures at risk for a given seismic hazard. They describe the probability of exceeding a given performance level under earthquake excitation, and are usually defined by a lognormal probability distribution function. Although debris from damaged buildings adjacent to road edges is the main cause of urban mobility disruption, studies on the fragility curves development for infrastructures subject to seismic actions focus on geotechnical effects, and do not analyze this type of road blockage. The article proposes an analytical procedure to construct fragility curves for urban road networks. It is based on the construction of debris graphs and the use of an appropriate fitting technique. For a given seismic intensity measure level, the developed fragility curves express the probability that the road is open or closed to the transit of emergency vehicles after debris fall. Therefore, the performance level is defined in terms of the width of the road pavement that remains free after the debris fall, or the width of the debris heap on the road pavement. Finally, the proposed framework is tested with real data of the main street in Amatrice, and the results are presented and discussed.

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Section: Discussion Of the Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fragility Curves of the Urban Road Network Based on the Debris Distributions of Interfering Buildings

2020

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“…Each portion of the beam represents a building inter-storey, whose shear and torsional stiffness are initially approximately evaluated according to a geometric reference model. Once the beam-like model of the entire building is defined, it can be calibrated on a reduced number of modal properties that can be easily identified through structural dynamic identification techniques such as Operational Modal Analysis OMA [21].…”

Section: The Beam-like Modelmentioning

confidence: 99%

“…In order to identify the best values of kx, ky, kc, appearing in Equation 4 The optimal values of the stiffness coefficients kx, ky, kc, to be adopted for the non-uniform beamlike model equivalent to the given 3D frame structure are those that minimize the objective function defined in Equation (21). The latter optimization problem is solved with an iterative solution procedure by means of the Linear Constrained Minimization Pattern search algorithm [22].…”

Section: Shear and Torsional Beam Stiffness Optimizationmentioning

confidence: 99%

An Equivalent Non-uniform Beam-like Model for Dynamic Analysis of Multi-storey Irregular Buildings

Greco¹,

Fiore²,

Occhipinti³

et al. 2020

Preprint

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Dynamic analyses and seismic assessments of multi-storey buildings at urban level require large-scale simulations and computational procedures based on simplified but accurate numerical models. At this aim the present paper propos-es an equivalent non-uniform beam-like model, suitable for the dynamic analysis of buildings with asymmetric plan and non-uniform vertical distribution of mass and stiffness. The equations of motion of this beam-like model, which pre-sents only shear and torsional deformability, are derived through the application of Hamilton’s principle. The linear dy-namic behaviour is evaluated by discretizing the continuous non-uniform model according to a Rayleigh-Ritz approach based on a suitable number of modal shapes of the uniform shear-torsional beam. In spite of its simplicity, the model is able to reproduce the dynamic behaviour of low- and mid-rise buildings with a significant reduction of the computa-tional burden with respect to that required by more general models. The efficacy of the proposed approach has been tested, by means of comparisons with linear FEM simulations, on three multi-storey buildings characterized by different irregularities. The satisfactory agreement, in terms of natural frequencies, modes of vibration and seismic response, proves the capability of the proposed approach to reproduce the dynamic response of complex spatial multi storey frames.

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“…OMA is nowadays widely used in engineering applications, ranging from the field of damage assessment [6] to that of the seismic response prediction [7,8].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of a Strengthened Barrel Vault

Primio¹,

Fiorini²,

Spina³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Structural monitoring and vibration-based identification methods are fundamental tools to help assessing the conditions of the structural state, in particular as it concern the conservation of historical buildings and the support to civil protection strategies. Although a large part of the Italian and European historical heritage is composed by masonry and vaulted structures, in the literature, comparatively few papers are targeted to the study of the dynamic behaviour of vaulted systems. The present work originates by a spontaneous collaboration between the Chieti/Pescara University and the Italian Civil Protection Department and focuses on the study of the dynamic behaviour of a barrel vault of the Bussi Castel located in Province of Pescara. The barrel vault suffered some damage as a consequence of the 2009 L'Aquila earthquake. Environmental vibration tests were carried out both in the damaged state and after repair and strengthening. In either conditions, the modal parameters of the vault were identified using operational modal analysis techniques. The comparison of the dynamic behaviour in the two states clearly indicates an improvement in the seismic behaviour of the consolidated vault. The results confirm the validity of structural monitoring for the evaluation of the effectiveness of the structural conditions of vaulted masonry systems.

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A probabilistic simplified seismic model of masonry buildings based on ambient vibrations

Cited by 20 publications

References 23 publications

Fragility Curves of the Urban Road Network Based on the Debris Distributions of Interfering Buildings

Fragility Curves of the Urban Road Network Based on the Debris Distributions of Interfering Buildings

An Equivalent Non-uniform Beam-like Model for Dynamic Analysis of Multi-storey Irregular Buildings

Monitoring of a Strengthened Barrel Vault

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