Close-range Blast Response Prediction of Hollow Circular Concrete Columns with Varied Hollowness Ratio, Arrangement of Compression Steel, and Confining Stirrups’ Spacing

Anas, S.M.; Alam, Mehtab

doi:10.1007/s40996-022-00951-5

Cited by 21 publications

(9 citation statements)

References 94 publications

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“…MAT_CDP makes use of tabulated EOS to define the connection between p and 𝜇. A comprehensive and detailed explanation of MAT_CDP is also given in recent publications by the authors [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. CDP parameters details can also be found in [1].…”

Section: 𝜎 𝑐0mentioning

confidence: 99%

Widely Employed Constitutive Material Models in Abaqus FEA Software Suite for Simulations of Structures and Their Materials: A Brief Review

Anas,

Tahzeeb,

Al-Dala’ien

et al. 2024

E3S Web Conf.

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The structural response of masonry/concrete structures depends upon the load-carrying mechanism and subsequently deformations produced by loads carried. In masonry/concrete structures, identification of the stress/strain imposing stress conditions and strain hardening/softening makes the structural response more complicated. Elastic damage models or elastic-plastic constitutive laws are inadequate to simulate masonry/concrete response under high strain-rate loadings. Further, irreversible or plastic strain cannot be realized using the elastic damage model. Several constitutive damage models are available in the literature. In this article, a concise explanation of the functioning of different material models in the Abaqus software package has been provided. These models include concrete damage plasticity for concrete and masonry, traction separation constitutive laws for brick-mortar interface, Hashin's criteria for CFRP, Johnson-Cook plasticity for steel, and crushable foam plasticity hardening for metallic foams. Researchers frequently utilize these models for numerical simulations and modeling of infrastructural elements and their respective materials when subjected to various structural loads. Besides, this paper presents a discourse on problem-solving methods and a comparison between explicit and implicit analysis. The research provides valuable input to researchers and practitioners in the field of structural engineering for an in-depth understanding of the functioning of Abaqus' pre-existing material models.

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Section: 𝜎 𝑐0mentioning

confidence: 99%

Widely Employed Constitutive Material Models in Abaqus FEA Software Suite for Simulations of Structures and Their Materials: A Brief Review

Anas,

Tahzeeb,

Al-Dala’ien

et al. 2024

E3S Web Conf.

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“…To implement this approach, the concrete damage plasticity model (CDP), initially developed by [30] and expanded upon by [31], has been incorporated into the Abaqus code. The CDP model presents a versatile capability for analyzing concrete structures subjected to a broad spectrum of loading conditions, encompassing both static and dynamic scenarios [33][34][35][36][37][38][39][40][41]. The model incorporates the influence of strain rate by integrating dynamic increase coefficients, as detailed in the referenced study [14].…”

Section: Model Setupmentioning

confidence: 99%

“…The model incorporates the influence of strain rate by integrating dynamic increase coefficients, as detailed in the referenced study [14]. The simulation of the steel reinforcement's behavior is carried out by employing the Johnson Cook dynamic failure model [14][15][33][34][35][36][37][38][39][40][41]. This particular model considers the influence of strain rate not only on the strength of the material, but also on its ductility.…”

Section: Model Setupmentioning

confidence: 99%

Effect of Impactor's Taper Angle on the Response of a Square Slab to a Falling Mass

Anas,

Al-Dala’ien,

Alam

et al. 2024

E3S Web Conf.

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Reinforced concrete (RC) slabs during their service life experience falling mass impacts which are significantly different from quasi-static loading on account of short-term load transference and higher strain rate. Slab being a thin flexural member is prone to short-term dynamic loadings susceptible to irreparable damage or even collapse. Considerable research has been done with round impacting mass, however, the impacting mass needs not necessarily be round and may have a different geometry such as a rolling boulder or fragmented rock mass. To simulate the practical impacting geometries of the falling mass, eight different variations of the geometries varying from flat of 300mm diameter followed by 40mm flat with tapering from 90° to 0° in increments of 15° keeping the material characteristics and drop height of the falling mass constant across all the eight cases, have been considered herein to investigate the influence of impactor’s taper angle on the anti-impact response of the validated square slab in Abaqus Explicit package program. A comparison of several response parameters including displacement, damage, stress distribution, and plastic dissipation energy has been done with the validated model, and the geometries of the impactor causing the maximum and minimum damages are identified. A key finding from this study is that all considered impacting geometries lead to bond failure in the lower layer of the re-bars, however, the impactors having the geometry with taper angles below 45° possess the capacity to induce bond failure in the re-bars of the upper layer too, beyond the impacted region.

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“…During strain rate loading, many factors affect the behavior of the material which includes the Stefan effect, body inertia, specimen dimensions, and the resistance between specimen and loading apparatus. Numerous research effects were performed in the past to study the behavior of concrete under dynamic loading (related explicitly to blast (Anas and Alam, 2022;Anas et al, 2021aAnas et al, , 2021b); however, due to complexity, the characterization is still an open issue for the research. The frictional and inertial effect, rather than other factors, like the existence of microcracks, free water, or the viscoelastic properties of the hardened concrete samples, are the main causes of the increase in Dynamic Increase Factor at medium to high strain rates.…”

Section: Strain Ratementioning

confidence: 99%

A comprehensive experimental review of strain rate, size effect, creep and confinement in concrete: Part III

Ahmed

Park

Voyiadjis

2023

International Journal of Damage Mechanics

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A comprehensive review of destructive testing techniques to understand concrete behavior is presented in this work. The main objective of this article is to summarize the literature from the last three decades related to the following topics: 1) the size effect in plain and reinforced concrete, 2) the crack estimation and propagation in concrete under various loading conditions, 3) the determination of material properties of concrete using triaxial testing techniques, 4) the behavior of concrete under creep and early age shrinkage which eventually affect the properties of concrete and lastly 5) the strain rate effect in concrete using various experimental techniques such as Split Hopkinson pressure bar, impact loading, drop hammer and the literature related to cyclic loading on concrete. The scope of the presented work is limited to destructive testing related to the topics defined above. To completely understand the behavior of material, at least three aspects must be required: the material’s theoretical basics, experimental validation, and numerical implementation. The authors presented the review articles related to theoretical basics and numerical implementation in parts I and II of this article. The presented work is part III, which is related to experimental work. In the upcoming section, the research related to specific topics is presented, and a summary is provided at the end of each section. Finally, the future works and the research directions are shown in the conclusion section.

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Close-range Blast Response Prediction of Hollow Circular Concrete Columns with Varied Hollowness Ratio, Arrangement of Compression Steel, and Confining Stirrups’ Spacing

Cited by 21 publications

References 94 publications

Widely Employed Constitutive Material Models in Abaqus FEA Software Suite for Simulations of Structures and Their Materials: A Brief Review

Widely Employed Constitutive Material Models in Abaqus FEA Software Suite for Simulations of Structures and Their Materials: A Brief Review

Effect of Impactor's Taper Angle on the Response of a Square Slab to a Falling Mass

A comprehensive experimental review of strain rate, size effect, creep and confinement in concrete: Part III

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