Seismic Risk Assessment of Historic Masonry Towers: Comparison of Four Case Studies

Bartoli, Gianni; Betti, Michele; Monchetti, Silvia

doi:10.1061/(asce)cf.1943-5509.0001039

Cited by 54 publications

(21 citation statements)

References 30 publications

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“…This tower, the so-called Becci tower, shows a quite regular geometry characterized by a total height of about 38 m and an almost square cross-section sizing 6.8 × 6.9 m. The thickness of the walls ranges from 2.3 to 1.5 m; the walls are constituted by a multilayered stone masonry typology with the internal and external faces made from a soft stone. The internal core material is unknown for this particular tower, but it may be composed of heterogeneous stone blocks tied by a good mortar, like similar towers in San Gimignano [18]. The section sizes are almost constant along the height of the tower except for the lower level where larger size openings were created to allow the connection of the tower with the adjacent buildings.…”

Section: Representative Masonry Towermentioning

confidence: 99%

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A Bayesian model updating framework for robust seismic fragility analysis of non-isolated historic masonry towers

Bartoli

Betti

Marra

et al. 2019

Phil. Trans. R. Soc. A.

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Seismic assessment of existing masonry structures requires a numerical model able to both reproduce their nonlinear behaviour and account for the different sources of uncertainties; the latter have to be dealt with since the unavoidable lack of knowledge on the input parameters (material properties, geometry, boundary conditions, etc.) has a relevant effect on the reliability of the seismic response provided by the numerical approaches. The steadily increasing necessity of combining different sources of information/knowledge makes the Bayesian approach an appealing technique, not yet fully investigated for historic masonry constructions. In fact, while the Bayesian paradigm is currently employed to solve inverse problems in several sectors of the structural engineering domain, only a few studies pay attention to its effectiveness for parameter identification on historic masonry structures. This study combines a Bayesian framework with probabilistic structural analyses: starting from the Bayesian finite element model updating by using experimental data it provides the definition of robust seismic fragility curves for non-isolated masonry towers. A comparison between this method and the standard deterministic approach illustrates its benefits. This article is part of the theme issue ‘Environmental loading of heritage structures’.

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Section: Representative Masonry Towermentioning

confidence: 99%

“…Poisson's modulus has been set as a constant and equal to ν = 0.2. These values have been selected taking into account the masonry typology of the considered tower, which can be classified as Soft Stone Masonry [18,24].…”

Section: (I) Mechanical Properties Of the Masonrymentioning

confidence: 99%

A Bayesian model updating framework for robust seismic fragility analysis of non-isolated historic masonry towers

Bartoli

Betti

Marra

et al. 2019

Phil. Trans. R. Soc. A.

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“…While the structural behaviour of a new masonry construction is a relatively simple task (thanks both to the presence of standard codes and inherent literature), the prediction of the structural response of monumental buildings is a more challenging task due to different aspects ( [7], [8], [9]). At first, each monumental building is "by definition" a unique building, characterized by its own history, often resulting in a composite mixture of added or substituted structural elements, strongly interacting ( [10], [11]).…”

Section: Introductionmentioning

confidence: 99%

A Stochastic Approach for the Collapse Probability of Historic Masonry Towers

Facchini¹,

Betti²,

Gasparini³

et al. 2019

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

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A great part of the Italian built heritage is constituted of historic masonry towers. Such structures, due to their intrinsic vulnerability are prone to seismic risk and, like every historic structure, exhibit many constructive aspects which are difficult to be caught from a numerical point of view. Among the most common: the restraint conditions is not exactly clear as they are often embedded in other buildings (such as churches bell-towers); the material behavior can't be simply identified as the masonry walls are often multi-leaf walls, made of three layers, each one with different mechanical characteristics, etc. In this paper, with the aim to include most of the sources of uncertainties, to assess the seismic risk of historic masonry towers a probabilistic approach is presented. The probabilistic framework, originally introduced by Gusella (1991), is herein discussed through an illustrative case study: the Torre Grossa of San Gimignano, Italy. In a first part of the paper some experimental results, accelerations of some level of the tower under ambient noise, are employed to identify a numerical model. Subsequently the tuned numerical model is employed to perform non-linear time history analyses which constitute the basis for the evaluation of the Collapse Probability.

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“…The problem of the safety of existing masonry buildings is a matter of fundamental importance worldwide due to their high vulnerability to seismic actions [1], [2], [3], [4] and the high historical, artistic and economic value of the existing building heritage [5], [6]. Currently, one of the fundamental problems when considering a masonry building is to implement an efficient and reliable modeling strategy that takes into account the main features of the materials in use, the mutual link between bearing walls of the structure and the layering due to building history [7], [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Comparación de modelos sísmicos para un edificio histórico en mampostería

Saba

Meloni

2018

revuin

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Vol. 17, n° 2, pp. [105][106][107][108][109][110][111][112][113][114] 2018 Revista UIS Ingenierías AbstractIn this project, a historic masonry building in Sardinia, Italy has been considered as a case study for the comparison of two approaches for modeling, static and seismic analysis. Two software with different modeling approaches were employed with the purpose of comparing and discussing the results. SismiCad12 was used to simulate the structural behavior of the historic masonry building. SismiCad12 uses the Finite Element Method (FEM) that allows to model and analyze most types of 3D structures, and it is suitable for masonry structures. On the other hand, a different and innovative modeling approach called Frame Macro Elements (FME) was also applied using the 3Muri software, specially designed for assessing the linear, nonlinear, and seismic behavior of masonry structures.Assuming the same hypothesis to construct the 3D model of the structure in each code, the results of the static analysis show a different distribution of the vertical loads in the structure, which are more realistic in the FEM modeling. This different criterion of evaluation of the vertical loads carries a mechanism of "soft floor" in the pushover analysis in the FEM modeling, and therefore, a lower ultimate displacement corresponding to the collapse of the structure. On the other hand, in dynamic analyzes, FME modeling is more receptive to reality, involving a massive percentage of masses participating in the first vibration modes.Keywords: macro-elements; historic structures; pushover analysis. ResumenEn este proyecto se ha considerado como caso de estudio un edificio histórico de mampostería en Cerdeña, Italia, cuyo modelado, análisis estático y sísmico han sido desarrollados. En este estudio se han empleado dos programas informáticos con distintos enfoques de modelización con el propósito de comparar y discutir los resultados. Como primer simulador del comportamiento de la estructura en mampostería se ha elegido SismiCad12, que es una suite de Elementos Finitos (FEM, por sus siglas en inglés) que permite modelar y analizar la mayoría de los tipos de estructuras 3D y es adecuado para estructuras de mampostería. Por otro lado, se ha aplicado un método de modelado diferente e innovador denominado Frame Macro Elements (FME) con el software 3Muri, diseñado específicamente para evaluar el comportamiento lineal, no lineal y sísmico de las estructuras en mampostería.Suponiendo la misma hipótesis para construir el modelo 3D de la estructura en cada código, los resultados de los análisis estáticos muestran una diferente repartición de las cargas verticales en la estructura, las que son más realísticas en el modelado FEM. Este diferente criterio de evaluación de las cargas verticales lleva un mecanismo de "piso suave" 106M. Saba, D. Meloni en el análisis de pushover en el modelado FEM, y por lo tanto un desplazamiento ultimo inferior correspondiente al colapso de la estructura. Por lo contrario, en los análisis dinámicos el modelado FME es má...

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Seismic Risk Assessment of Historic Masonry Towers: Comparison of Four Case Studies

Cited by 54 publications

References 30 publications

A Bayesian model updating framework for robust seismic fragility analysis of non-isolated historic masonry towers

A Bayesian model updating framework for robust seismic fragility analysis of non-isolated historic masonry towers

A Stochastic Approach for the Collapse Probability of Historic Masonry Towers

Comparación de modelos sísmicos para un edificio histórico en mampostería

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