Simplified Seismic Analysis of Disordered Masonry Towers

Facchini, Luca; Betti, Michele

doi:10.1061/ajrua6.0000856

Cited by 19 publications

(10 citation statements)

References 23 publications

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“…It is noteworthy to remember that, apart the finite element technique, other approach have been proposed, and are today available in the scientific literature, to investigate the nonlinear response of masonry towers such as the ones proposes in [20], [21], [22], [23], [24].…”

Section: Fe Numerical Modelmentioning

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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Section: Fe Numerical Modelmentioning

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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show abstract

“…The knowledge of the geometry and mechanical properties of materials is often a weakness for the structural engineer involved in structural analyses and assessment. For bell towers and masonry towers in general, an accurate structural model is mandatory, when the quantification of structural vulnerability is required, as shown in [1][2][3][4][5][6][7]. Different methods of analysis, including nonlinear dynamics are used to study the seismic response of slender masonry towers [8][9][10][11], so it is important that accurate geometrical and mechanical inputs are available, otherwise sophisticated analyses do not appear meaningful.…”

Section: Introductionmentioning

confidence: 99%

Seismic Capacity Estimation of a Masonry Bell-Tower with Verticality Imperfection Detected by a Drone-Assisted Survey

2020

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Masonry towers are considered an important part of cultural heritage due to their architectural and historical value. From a structural perspective these kind of buildings are considered slender elements, the same as a cantilever beam. In real cases it is not easy to model with high accuracy these heritage constructions, since the geometry and mechanical properties of the constituent materials are not adequately known. On the other hand, a deep knowledge of the structural and seismic vulnerability of the masonry towers is needed in order to preserve and retrofit, when necessary, their architectural and cultural value. In the present research an exhaustive study is presented, as it regards the assessment of the seismic vulnerability of a heritage masonry bell-tower, built in the 14th century. An innovative protocol of structural survey followed, and it is proposed herein. The geometry of the tower was easily obtained by digital photogrammetry assisted by a drone. The geometrical model was easily converted into a digitalized input, that was introduced into a finite element method (FEM)-based code. The 3D model was used for linear static, linear dynamic and nonlinear static (pushover) structural analyses. The vulnerability of the masonry tower was assessed and at least one kinematic was found to be not verified.

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“…The nonlinear system of equations was solved by an incremental Newton-Raphson method. Details of the T analyses are reported in [15]. If for instance the force is harmonic, then the top displacement of the cantilever beam exhibits a slight hysteretic behavior, as shown in Fig.…”

Section: Numerical Fe Modelingmentioning

confidence: 99%

“…It can be shown [15] that parameter A in eq. (1) is redundant, and hence in the following it will be considered as unitary: A=1.…”

Section: Approximation Of the Tower Response With Bouc And Wen Oscillatormentioning

confidence: 99%

An efficient Bouc & Wen approach for seismic analysis of masonry tower

Facchini

Betti

2014

Frattura Ed Integrità Strutturale

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ABSTRACT. The assessment of existing masonry towers under exceptional loads, such as earthquake loads, requires reliable, expedite and efficient methods of analysis. These approaches should take into account both the randomness that affects the masonry properties (in some cases also the distribution of the elastic parameters) and, of course, the nonlinear behavior of masonry. Considering the need of simplified but effective methods to assess the seismic response of such structures, the paper proposes an efficient approach for seismic assessment of masonry towers assuming the material properties as a stochastic field. As a prototype of masonry towers a cantilever beam is analyzed assuming that the first modal shape governs the structural motion. With this hypothesis a nonlinear hysteretic Bouc & Wen model is employed to reproduce the system response which is subsequently employed to evaluate the response bounds. The results of the simplified approach are compared with the results of a finite element model to show the effectiveness of the method.

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Simplified Seismic Analysis of Disordered Masonry Towers

Cited by 19 publications

References 23 publications

A Stochastic Approach for the Collapse Probability of Historic Masonry Towers

A Stochastic Approach for the Collapse Probability of Historic Masonry Towers

Seismic Capacity Estimation of a Masonry Bell-Tower with Verticality Imperfection Detected by a Drone-Assisted Survey

An efficient Bouc & Wen approach for seismic analysis of masonry tower

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