Dynamic simulations of traditional masonry materials at different loading rates using an enriched damage delay: Theory and practical applications

Piani, T. Li; Weerheijm, J.; Sluys, L.J.

doi:10.1016/j.engfracmech.2019.106576

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…where σ is the stress, ε is the corresponding strain, and a 0-2 are material constants calibrated for adobe as in Figure 13b. In fact, as a quasi-brittle material, the mechanical performance of adobe has been found to be dependent on the applied loading rate and quantitative assessments of the rates of changes in the main mechanical properties were experimentally tested and numerically simulated [25], [27]. DIF functions in eq.…”

Section: Standardmentioning

confidence: 99%

Critical Review on the Material Characterization of Adobe Elements

Piani¹,

Weerheijm²,

Sluys³

2022

Journal of Green Building

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Adobe is a traditional masonry made of sundried earthen bricks and mud mortar. Despite a millennial history of buildings of architectural value, adobe still connotes a so called ‘not engineered’ construction type. Namely, the material and structural properties of adobe are still not entirely addressed, resulting in an equally uncertain normative framework for adobe buildings design. However, over the last ten years, a large research program has been conducted in the Netherlands to qualify the material and structural properties of this sustainable building technology. In this paper, a critical analysis of the current normative body for the material characterization of adobe is addressed. Guidelines, prescriptions and requirements related to test methods, materials selection and properties contained in the available building codes for adobe around the world are assessed. A critical normative review is performed using the most recent literature produced on adobe, with particular regards to the results of experimental tests and numerical simulations performed by the authors. On the basis of these findings, some issues have been identified in relation to the knowledge currently condensed in the norms for adobe. A series of programmatic guidelines is aimed at orienting future research on adobe as well as fostering the process of updating its current normative body.

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Section: Standardmentioning

confidence: 99%

Critical Review on the Material Characterization of Adobe Elements

Piani¹,

Weerheijm²,

Sluys³

2022

Journal of Green Building

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“…The lower sensitivity of strength to high strain rates exhibited by adobe samples containing fibres is interpreted by linking principles of fracture mechanics to hypotheses on the specific heterogeneity level of fiber enriched mixtures of adobe [10]. Given the failure processes depicted in Par.…”

Section: Fig 8 Dif Functions For Type a And Type Bmentioning

confidence: 99%

Size Dependence and Dynamic Properties of Adobe Masonry Bricks tested at high strain rates

et al. 2021

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Masonry is a construction technique which typically reacts in compression. Characterization of its material properties in compression is thus of paramount importance. This especially counts for adobe bricks because their material properties are still unknown to a large extent. This traditional masonry, made of locally available soil and fibres, is spread in areas currently involved in military conflicts, where also European forces operate. Therefore, not only its static properties in compression, but even more the dynamic strength is a relevant parameter. Laboratory characterization of material properties still pose several challenges, among which so-called size dependence is one of the most controversial topics. This entails the possible variation of material properties values from tests on specimens of different size and shape. Several factors may concur to its determination and a well-founded theory does not exist yet. This counts for statics and even more in dynamics. Addressing the properties in compression of bricks at high strain rates is rare, namely no studies of size dependence on masonry bricks in dynamic regimes are published. Lately, a series of experimental campaigns were conducted by the authors at the Joint Research Centre of the European Commission. In these campaigns, a series of compression tests were performed on several types of adobe bricks. Different soil mixtures were used to produce cylindrical samples of different sizes. Compressive tests from 2e-5 s-1 to 10 s-1 and 100 s-2 were executed using hydraulic machines as well as split Hopkinson bars. Next, the static as well as the dynamic material properties as calculated from tests on specimens of different sizes and material compositions have been qualitatively and quantitatively compared and interpreted. In this paper, the experimental program is presented, next the material properties in strength and ductility as well as the dynamic increase factors are investigated.

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“…This is achieved by dividing the rates of the equivalent strains by a strain rate dependent factor which is equal to one for quasi-static loading and increases with increasing strain rate. This way to model the rate dependence of strength is a simplified version of the often used damage delay approach [74][75][76]. A visco-elastic model to describe the rate dependence of the elastic response as used, for instance, in [75,77] was not considered in this study.…”

Section: Concrete Constitutive Modelmentioning

confidence: 99%

On the dynamic response of reinforced concrete beams subjected to drop weight impact

Leppänen

Johansson

Grassl

2020

Finite Elements in Analysis and Design

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To improve the impact resistance of reinforced concrete structures, a detailed understanding of the dynamic response is required. This study investigates this impact resistance using experiments in combination with 3D non-linear finite element (FE) simulations. The experiments made use of high-speed photography and digital image correlation (DIC), while a damage-plasticity constitutive model for concrete was used in the FE simulations. Drop weight impact tests of simply supported reinforced beams made of plain concrete and fibre reinforced concrete were made, and it was shown that the addition of fibres reduced crack spacing, crack widths and mid-point deflections. For the FE approach, tetrahedral elements were shown to be well suited for capturing inclined shear cracks and the structural response obtained in experiments and analyses agreed very well. The FE analyses showed that the reinforcement strains were more localised for concrete with fibres, and hence predicted an increased risk of reinforcement rupture.

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Dynamic simulations of traditional masonry materials at different loading rates using an enriched damage delay: Theory and practical applications

Cited by 4 publications

References 35 publications

Critical Review on the Material Characterization of Adobe Elements

Critical Review on the Material Characterization of Adobe Elements

Size Dependence and Dynamic Properties of Adobe Masonry Bricks tested at high strain rates

On the dynamic response of reinforced concrete beams subjected to drop weight impact

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