Discrete Element Analysis of the Shear Resistance of Planar Walls with Different Bond Patterns

Ferenc, Szakály; Hortobágyi, Zsolt; Bagi, Katalin

doi:10.2174/1874836801610010220

Cited by 18 publications

(11 citation statements)

References 14 publications

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“…Technical details of the applied 3DEC code are described in several papers, books and manuals, for example, in Lemos (2016), Lengyel and Bagi (2015), or Szakaly, Hortobagyi and Bagi (2016).…”

Section: The Applied Methodsmentioning

confidence: 99%

Horizontal reaction components of pointed vaults

Lengyel

Bagi

2016

IJMRI

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Abstract:The magnitude of horizontal reactions under self-weight are analysed for pointed barrel vaults with different eccentricities. The magnitude is expressed as the function of the eccentricity (deviation of the pointed generator curve from the circle). Vaults with fixed supports and with increasing outwards support displacements are considered. An analytical model based on continuous Timoshenko beam theory is suggested for barrel vaults and then checked with computer-simulated experiments. The results show that with increasing support separation, the horizontal reaction tends to be at a constant value when reaching the statically determinate state. After this, the horizontal reaction varies only because of the gradual modification of the geometry due to large support displacements.

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Section: The Applied Methodsmentioning

confidence: 99%

Horizontal reaction components of pointed vaults

Lengyel

Bagi

2016

IJMRI

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“…More details on 3DEC can be found e.g. in Szakaly et al [24], Rigo & Bagi [30], Sarhosis et al [31].…”

Section: Validation Of the Theoretical Predictions With Simulated Experimentsmentioning

confidence: 99%

Crosswise tensile resistance of masonry patterns due to contact friction

Chen

Bagi

2020

Proc. R. Soc. A.

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The presented research focuses on masonry shells with dry (cohesionless) contacts. In the mechanical analysis of such structures, the material is often assumed to have zero resistance to tension. This simplification can be questioned in light of the fact that due to the frictional resistance between masonry layers compressed to each other, significant tension can be carried perpendicularly to the direction of the compression. The effect can be so considerable that the typical orange-slice cracking of masonry domes can be prevented purely by choosing a suitable brick shape and bond pattern. Based on preliminary 3DEC discrete element simulations with realistic and experimentally validated material parameters in order to understand the failure modes, the phenomenon is quantified in the present paper for the two main types of bond patterns applied in masonry shells: (i) different versions of the running bond pattern, and (ii) two versions of the herringbone pattern. The theoretically predicted failure tensile stresses are checked and validated with 3DEC discrete element simulations.

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“…Time scaling (which involves a convenient modification of loading rate) was implemented by introducing a multistepped loading history: The horizontal velocity was increased gradually, leading to a displacement of 1 mm in 0.135 seconds. Then, undertaking the approach suggested by Szakály et al an equilibrating phase followed: Velocities were set to zero, and simulation was continued until the average unbalanced nodal force resultant divided by the average load acting on the nodes became smaller than 10 5 . In the 3DEC framework, mass scaling (according to which ρ is iteratively adjusted in order to decrease v s ) is automatically performed when adaptive global damping is employed.…”

Section: The Dem For Masonry Structuresmentioning

confidence: 99%

Distinct element modelling of the in‐plane cyclic response of URM walls subjected to shear‐compression

Malomo

DeJong

Penna

2019

Earthq Engng Struct Dyn

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Summary The in‐plane capacity of unreinforced masonry (URM) elements may vary considerably depending on several factors, including boundary conditions, aspect ratio, vertical overburden, and masonry texture. Since the overall system resistance mainly relies on the in‐plane lateral capacity of URM components when out‐of‐plane modes are adequately prevented, the structural assessment of URM structures could benefit from advanced numerical approaches able to account for these factors simultaneously. This paper aims at enhancing and optimising the employment of the distinct element method, currently confined to the analysis of local mechanisms of reduced‐scale dry‐joint blocky assemblies, with a view to simulate the experimentally observed responses of a series of URM full‐scale specimens with mortared joints subjected to quasi‐static in‐plane cyclic loading. To this end, a mesoscale modelling approach is proposed that employs a simplified microscale modelling approach to effectively capture macroscale behaviour. Dynamic relaxation schemes are employed, in combination with time, size, and mass‐scaling procedures, to decrease computational demand. A new methodology for numerically describing both unit, mortar and hybrid failure modes, also including masonry crushing due to high‐compression stresses, is proposed. Empirical and homogenisation formulae for inferring the elastic properties of interface between elements are also verified, enabling the proposed approach to be applied more broadly. Using this modelling strategy, the interaction between stiffness degradation and energy dissipation rate was accounted for numerically. Although the models marginally underestimate the energy dissipation in the case of slender piers, a good agreement was obtained in terms of lateral strength, hysteretic response, and crack pattern.

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Discrete Element Analysis of the Shear Resistance of Planar Walls with Different Bond Patterns

Cited by 18 publications

References 14 publications

Horizontal reaction components of pointed vaults

Horizontal reaction components of pointed vaults

Crosswise tensile resistance of masonry patterns due to contact friction

Distinct element modelling of the in‐plane cyclic response of URM walls subjected to shear‐compression

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