Mesoscopic study on historic masonry

Šejnoha, Jiřı́; Šejnoha, Michal; Zeman, Jan; Sýkora, Jan; Vorel, Jan

doi:10.12989/sem.2008.30.1.099

Cited by 42 publications

(20 citation statements)

References 30 publications

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“…[17,21,22] that image analysis of real, rather then artificial, material systems plays an essential role in the derivation of a reliable and accurate computational model. This issue is revisited here to get, although considerably simplified, a reasonably accurate computational model (RVE→SEPUC) representing the real microstructure of Mastic Asphalt mixtures.…”

Section: Concept Of Statistically Equivalent Periodic Unit Cellmentioning

confidence: 99%

Macroscopic Constitutive Law for Mastic Asphalt Mixtures from Multiscale Modeling

Valenta¹,

Šejnoha²,

Zeman³

2010

Int J Mult Comp Eng

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A well established framework of an uncoupled hierarchical modeling approach is adopted here for the prediction of macroscopic material parameters of the Generalized Leonov (GL) constitutive model intended for the analysis of flexible pavements at both moderate and elevated temperature regimes. To that end, a recently introduced concept of a statistically equivalent periodic unit cell (SEPUC) is addressed to reflect a real microstructure of Mastic Asphalt mixtures (MAm). While mastic properties are derived from an extensive experimental program, the macroscopic properties of MAm are fitted to virtual numerical experiments performed on the basis of first order homogenization scheme. To enhance feasibility of the solution of the underlying nonlinear problem a two-step homogenization procedure is proposed. Here, the effective material properties are first found for a mortar phase, a composite consisting of a mastic matrix and a fraction of small aggregates. These properties are then introduced in place of the matrix in actual unit cells to give estimates of the model parameters on macroscale. Comparison with the Mori-Tanaka predictions is also provided suggesting limitations of classical micromechanical models.

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Section: Concept Of Statistically Equivalent Periodic Unit Cellmentioning

confidence: 99%

Macroscopic Constitutive Law for Mastic Asphalt Mixtures from Multiscale Modeling

Valenta¹,

Šejnoha²,

Zeman³

2010

Int J Mult Comp Eng

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“…The Mohr-Coulomb interfacial element, characterized by the cohesion c, the angle of internal friction φ and the tensile strength cut-off f t , was used to simulate an imperfect bond between bricks and mortar. The elastic constants of the material model as well as the compressive and tensile strengths were determined directly from a simulated uni-axial loading by the overall strain applied in the planes of the material orthotropy; the macroscopic fracture energy was estimated by a novel procedure derived from the RILEM work-of-fracture method [32]. In order to incorporate, at least to some extent, the initial and damage-induced anisotropy typical of masonry, the parameters used in the macroscale simulations were set to the geometrical averages of the values obtained in the two directions.…”

Section: Virtual Testing Via Computational Homogenizationmentioning

confidence: 99%

“…[33]. Additional details of the procedure including a numericalexperimental verification can be found in the accompanying paper [32].…”

Section: Virtual Testing Via Computational Homogenizationmentioning

confidence: 99%

Pragmatic multi-scale and multi-physics analysis of Charles Bridge in Prague

Zeman

Novák

Šejnoha

et al. 2008

Engineering Structures

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Charles Bridge in Prague is one of the most famous monuments of the European architectural heritage. As typical of complex historical structures, a realistic quantitative computational assessment of the bridge response should address multi-physics, multi-scale, time-dependent and three-dimensional aspects of the problem. In this paper, an example of such a study is reported. To keep the model complexity manageable, the analysis is executed in a fully-uncoupled format, where the outputs of individual simplified sub-problems concerning mainly transport phenomena serve as inputs for the dominant part: detailed non-linear three-dimensional and mechanicsoriented simulations of selected bridge segments. The obtained results not only provide the basis for reconstruction works currently in progress, but also demonstrate the applicability and limitations of multi-scale and multi-physics paradigms when faced with complex practical engineering problems.

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“…This is also true to asses the Representative Volume Element (RVE) for quasi periodic or random arrangements [6,7]. Moreover, the knowledge of the actual texture takes a fundamental role using the approach that involves the periodization of random media by statically equivalent periodic unit cell [8][9][10][11][12]. Eventually the texture knowledge is necessary for the homogenization residuals analysis [13].…”

Section: Introductionmentioning

confidence: 99%

Masonry elastic characteristics assessment by thermographic images

2019

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In the present paper, the elastic mechanical characteristics of masonry samples, whose texture is not visible due to plaster, are estimated by means of homogenization technique applied through thermographic images. In particular, three masonry samples with different textures have been purposely built. The textures chosen were periodic, quasi-periodic and random. The images, taken with a thermocamera, have been analyzed in order to identify the texture. An homogenization technique, based on the application of appropriate boundary conditions, has been used. The mechanical characteristics obtained using the textures identified using photographic images and thermographic images have been compared. The influence of some parameters (such as the dimensions of the structural element used in morphological operator) are analysed. The obtained results permits to point out the reliability of the masonry elastic characteristics assessment by the proposed procedure.

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Mesoscopic study on historic masonry

Cited by 42 publications

References 30 publications

Macroscopic Constitutive Law for Mastic Asphalt Mixtures from Multiscale Modeling

Macroscopic Constitutive Law for Mastic Asphalt Mixtures from Multiscale Modeling

Pragmatic multi-scale and multi-physics analysis of Charles Bridge in Prague

Masonry elastic characteristics assessment by thermographic images

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