Static Behavior of Cob: Experimental Testing and Finite-Element Modeling

Miccoli, Lorenzo; Silva, Rui André Martins; Oliveira, Daniel V.; Mueller, Urs

doi:10.1061/(asce)mt.1943-5533.0002638

Cited by 14 publications

(4 citation statements)

References 47 publications

(49 reference statements)

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“…(Jiménez Rios and O'Dwyer, 2020d) presented a study on the simulation of cob's nonlinear monotonic behavior using ANSYS and ABAQUS. The results were validated against the experimental outcomes reported by Miccoli et al (2019) and the pros and cons of different available constitutive models were identified and discussed. The results showed that Concrete and Concrete Damaged Plasticity were the best constitutive material models to reproduce cob's nonlinear monotonic behavior in ANSYS and ABAQUS, respectively.…”

Section: Cobmentioning

confidence: 95%

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Computational methods applied to earthen historical structures

Rios

Ruiz-Capel

Plevris

et al. 2023

Front. Built Environ.

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Earthen structures have an important representation among the UNESCO World Heritage List sites as well as among the built environment in general. Unfortunately, earthen heritage structures are also numerous within the UNESCO List of World Heritage in Danger whereas other existing common earthen structures are extremely vulnerable to seismic and climate change events. Within the field of heritage conservation, structural analysis contributes to the safety evaluation of the structure, the diagnosis of the causes of damage and decay, and to the validation of interventions. Thus, the need to develop effective and accurate computational methods suitable for the study of both monumental and vernacular earthen structures becomes evident. This paper compiles, summarizes, and highlights the latest developments and implementations of computational methods for the study of such structure typologies. The literature has been explored following the PRISMA-S checklist methodology and a narrative synthesis was used for the presentation of results. Finally, future trends, opportunities, and challenges are discussed.

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Section: Cobmentioning

confidence: 95%

“…Numerical modeling of cob has been undertaken by Miccoli et al (2019) using a FEM macro-modeling approach in DIANA. They assumed plane stress, homogeneity, and continuity of material.…”

Section: Cobmentioning

confidence: 99%

Computational methods applied to earthen historical structures

Rios

Ruiz-Capel

Plevris

et al. 2023

Front. Built Environ.

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“…Miccoli et al have utilised a mixture that contained 18% gravel and sand, 61% silt, and 21% clay [22,23,26]. Ben-Alon et al have used 257 kg of clay-rich soil with a 50% clay content for one square metre of cob and a thickness of 457 mm [3].…”

Section: 1mentioning

confidence: 99%

The State of the Art of Cob Construction: A Comprehensive Review of the Optimal Mixtures and Testing Methods

2023

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Earthen construction systems have potential hygrothermal, and environmental benefits over conventional building materials such as concrete. However, such systems are not yet fully optimised to be part of an energy-efficient building. Therefore, to further optimise the material, this review explores peerreviewed research articles that relate to different materials used in cob mixes and the different testing methods used to assess the produced specimen's hygrothermal performance. For data collection, a systematic keyword search was carried out on ScienceDirect, Scopus, Google scholar search engines and relevant books. The filtering of journal articles was based on studying the abstracts followed by analysing their content within the scope of the review. The results show that the soil's constituents and the added fibre ratios critically affect the percentages of clay and water added to the mixture. Fibres' impact on the mix was experimented with by multiple researchers using distinct types of plant aggregates. The percentage of fibre addition ranged between 0.9% and 3% for structural specimens and reached 25% for non-structural specimens with optimised insulation properties. However, there is no consensus and robust collated data available about the ratios of the mixes concerning the hygrothermal performance of the specimens. Therefore, a matrix for mixes and testing methods was developed with the available data to aid the progression of any future optimisation effort.

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“…In this analysis, this assumption is considered to be valid for cob as well. It is assumed that cob's tensile ultimate strength corresponds to only 13% of its compressive ultimate strength [39]. The Mohr-Coulomb stress safety tool takes direct account of this theory and is often considered to provide conservative results.…”

Section: Linear Elastic Fem Analysismentioning

confidence: 99%

Learning from the Past: Parametric Analysis of Cob Walls

Rios

2023

Applied Sciences

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In this paper, the results obtained from a series of parametric analyses, where the influence that geometric and mechanical parameters have in the structural response of existing vernacular cob walls within an Irish context, are presented. A design of experiments using central composite designs was implemented along with analysis of variance following two computational approaches, namely, the finite element method and kinematic limit analysis. As results, a series of response surfaces and parametric equations with which it is possible to compute safety factors and collapse multipliers (within the range of values studied) are provided. Based on the results obtained, it could be concluded that traditional cob walls in Ireland are very robust. Relatively high acceleration values, unlikely to happen in a low seismic hazard region such as Ireland, would be needed to start the collapse mechanisms studied or cause yielding in typical vernacular cob walls. Furthermore, the equations generated with the refined regression models can be used by practitioners as a first approach to estimate the safety levels of existing cob buildings with similar characteristics.

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Static Behavior of Cob: Experimental Testing and Finite-Element Modeling

Cited by 14 publications

References 47 publications

Computational methods applied to earthen historical structures

Computational methods applied to earthen historical structures

The State of the Art of Cob Construction: A Comprehensive Review of the Optimal Mixtures and Testing Methods

Learning from the Past: Parametric Analysis of Cob Walls

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