Uses and limits of the Equivalent Frame Model on existing unreinforced masonry buildings for assessing their seismic risk: A review

Quagliarini, Enrico; Maracchini, Gianluca; Clementi, Francesco

doi:10.1016/j.jobe.2017.03.004

Cited by 150 publications

(78 citation statements)

References 106 publications

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“…Regarding the experimental investigations, ambient vibration tests are the main methods for assessing the seismic behavior of full-scale structures Clementi et al, 2017Clementi et al, , 2018Ubertini et al, 2017Ubertini et al, , 2018. Obtained results have been used as the basis for implementing different non-linear analysis methods Brando et al, 2017;Quagliarini et al, 2017). Mostly, more accurate results have been obtained through the use of Finite Element (FE) models.…”

Section: Introductionmentioning

confidence: 99%

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Formisano

Vaiano

Fabbrocino

2019

Front. Built Environ.

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Italian buildings are mainly represented by unreinforced masonry (URM) constructions, which were mostly built before 1970, often without respecting seismic design criteria. The main objective of Italian designers is, therefore, to retrofit these buildings in order to improve their safety under earthquake, as well as to preserve the memory of the ancient building art. In addition, the assessment of the building energetic efficiency is nowadays a very pressing need for designers and practitioners. Energetic efficiency represents the capacity to optimize the consumption of energy resources in order to reach prefixed requirements for the environment protection . This paper shows both seismic and energetic retrofitting interventions on a residential URM building typical of the constructive practice in the South Italy. Initially, the building characterization under geometrical and structural viewpoints is done. Subsequently, the seismic vulnerability verification is performed with unsatisfactory results, so requiring upgrading or retrofitting interventions. Moreover, with the aim to increase living comfort and energy efficiency, energetic upgrading interventions, aimed at decreasing the building transmittance, are proposed. Seismic and energetic interventions are then computed from the economic point of view in order to evaluate the financial contributions foreseen by the Italian 2018 Balance Law through the Sismabonus and Ecobonus tools, respectively. Finally, the study proposes a global performance index able to take into account contemporary the seismic, energetic, and economic benefits deriving from retrofitting interventions applied on the inspected residential building.

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Section: Introductionmentioning

confidence: 99%

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Formisano

Vaiano

Fabbrocino

2019

Front. Built Environ.

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“…In addition, it requires low computational effort to simulate both linear and nonlinear lateral load behavior of practical large masonry wall panels. Detailed state-of-the-art reports can be found in [139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154].…”

Section: Modeling Masonry Using Equivalent Frame Methodsmentioning

confidence: 99%

Stochastic Vulnerability Assessment of Masonry Structures: Concepts, Modeling and Restoration Aspects

et al. 2019

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A methodology aiming to predict the vulnerability of masonry structures under seismic action is presented herein. Masonry structures, among which many are cultural heritage assets, present high vulnerability under earthquake. Reliable simulations of their response to seismic stresses are exceedingly difficult because of the complexity of the structural system and the anisotropic and brittle behavior of the masonry materials. Furthermore, the majority of the parameters involved in the problem such as the masonry material mechanical characteristics and earthquake loading characteristics have a stochastic-probabilistic nature. Within this framework, a detailed analytical methodological approach for assessing the seismic vulnerability of masonry historical and monumental structures is presented, taking into account the probabilistic nature of the input parameters by means of analytically determining fragility curves. The emerged methodology is presented in detail through application on theoretical and built cultural heritage real masonry structures. leading to a final approval (or rejection) of the decisions already taken for repair or strengthening of the existing structure. Step 8: Explanatory ReportThe last step, as a result of the proposed methodology, includes the detailed "Explanatory Report", where all the collected information, the diagnosis, including the safety evaluation, and any decision to intervene should be fully detailed. This document is essential for eventual future analyses and interventions' measures in the structure. Computational and Mathematical AspectsIn this section, the most basic analytical constitutive laws and numerical models required for the successful implementation of the proposed methodology are presented in detail. In particular, the finite element model for the macro-modeling of masonry structures, the failure criteria, the damage indices, the performance levels and the mathematical background of fragility curves are presented.

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“…On the other hand, Nakamura et al () concluded that the EF method may be nonconservative in predicting extensive building damage. In addition, the analysis accuracy relies on adequate modelling of frame behaviour (Quagliarini et al ), with the subject being an emerging research area especially for URM spandrels (Beyer and Mangalathu ). Overall, based on these limitations, it was considered appropriate to use the EF method to obtain acceleration response of the buildings in the relatively small range of PGA.…”

Section: Uncertainty In Seismic Demand Estimationmentioning

confidence: 99%

Seismic fragility assessment of nonstructural components in unreinforced clay brick masonry buildings

Derakhshan

Walsh

Ingham

et al. 2019

Earthq Engng Struct Dyn

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The results of an investigation of the probability of earthquake damage to nonstructural unreinforced masonry (URM) components are presented. The components include parapets, chimneys, and out-of-plane loaded facades typical of low-rise pre-1940 construction in Australia and New Zealand. The study is based on a street survey of component geometry, in situ data on material strength, and simplified mechanical models. Uncertainties in capacity and demand were quantified based on, respectively, stochastic and deterministic approaches. The damage probabilities were compared with relevant guidelines and empirical damage data from three earthquakes. The study established a link between the qualitative damage states reported in existing guidelines and the quantitative URM component damage states. While some median damage state thresholds correlated well with the data from the guidelines, a larger dispersion value was found in the current study due to the large variations in component properties. Comparisons with empirical data suggest that the developed fragility data provide a realistic estimate of nonstructural component damage that occurred in similar buildings, with a reasonable level of conservatism. The outcome is useful in rapid assessment of the seismic risks due to nonstructural component collapse in URM precincts. K E Y W O R D Schimney, clay brick, HAZUS, nonstructural, parapet, seismic risk, rapid assessment, unreinforced masonry

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Uses and limits of the Equivalent Frame Model on existing unreinforced masonry buildings for assessing their seismic risk: A review

Cited by 150 publications

References 106 publications

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Stochastic Vulnerability Assessment of Masonry Structures: Concepts, Modeling and Restoration Aspects

Seismic fragility assessment of nonstructural components in unreinforced clay brick masonry buildings

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