New special finite elements for modeling reinforcement and steel‐concrete interface

Khalil, Ali; Fawzy, Tarek M.; Taher, Salah El‐Din F.; Abdellah, Galal Abdel-Hamid

doi:10.1108/02644409910277979

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…For example, Mehrabi and Shing (1997) noted that the bond‐slip characteristics between steel and concrete was found insignificant in analysis of infilled frames. Steel reinforcement may be modeled by the smeared approach with distributed properties (Khalil et al , 1999). However, the most important property is the material nonlinearity of the homogenized media that accounts the elasto‐plastic behavior.…”

Section: Micro‐ To Macro‐scale Homogenizationmentioning

confidence: 99%

“…As far as micro‐modeling is concerned, the special steel‐concrete interface element and steel boom element are used (Khalil et al , 1999). Elasto‐plastic behavior with isotropic hardening is considered for reinforcement according to von Mises criterion where the onset of yielding is assumed to take place when the octahedral shearing stress reaches a critical value k , k =( J 2 ) 0.5 , as followswhere σ y is the yield stress from uniaxial tests.…”

Section: Micro‐ To Macro‐scale Homogenizationmentioning

confidence: 99%

“…For both micro‐ and macro‐modeling, the frame‐masonry interface is one of the most influencing parameters (Taher, 2000). The interface is modeled as non‐integral continuum material with no tensile capacity and brittle behavior in compression using an appropriate interface element (Khalil et al , 1999).…”

Section: Micro‐ To Macro‐scale Homogenizationmentioning

confidence: 99%

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Statistically equivalent nonlinear finite element model for infilled R. C. framed systemsThe present work is an extension to the thesis of the first author for the Master of Science degree.

Afefy

Taher

Khalil

et al. 2002

Engineering Computations

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The most simple equivalent frame system with reduced degrees of freedom is proposed for handling multi‐story multi‐bay infilled frames. The system is composed of homogenized continuum for the reinforced concrete members braced with unilateral diagonal struts for each bay, which are only activated in compression. Identification of the equivalent system characteristics and nonlinear material properties are accomplished from the concepts of inverse analysis approach along with statistical tests of hypotheses is employed to establish the appropriate filtering scheme and the proper accuracy tolerance. The suggested system allows for nonlinear finite element static and dynamic analysis of sophisticated infilled reinforced concrete frames. Sensitivity analysis is undertaken to check the suitability of the proposed system to manipulate various structural applications.

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Section: Micro‐ To Macro‐scale Homogenizationmentioning

confidence: 99%

Section: Micro‐ To Macro‐scale Homogenizationmentioning

confidence: 99%

See 1 more Smart Citation

Statistically equivalent nonlinear finite element model for infilled R. C. framed systemsThe present work is an extension to the thesis of the first author for the Master of Science degree.

Afefy

Taher

Khalil

et al. 2002

Engineering Computations

Self Cite

View full text Add to dashboard Cite

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“…The state-of-the-art review on the existing frame models with the inclusion of shear responses is presented in Ceresa et al (2007). Although the literature presents plenty of other interesting formulation approaches based on force-based element (Valipour and Foster, 2010; Li et al , 2011; Brunesi and Nascimbene, 2014; Brunesi et al , 2015; Feng et al , 2016; Yu et al , 2016; Brunesi and Parisi, 2017) or displacement-based element (Khalil et al , 1999; Stramandinoli and La Rovere, 2012; Zivaljic et al , 2013; Li et al , 2016; Lezgy-Nazargah, 2018), there is still a lack for methods that consider bond-slip behaviors based on a finite strain-description. However, several beam ﬁnite elements have been proposed by many researchers in large displacement problems with finite strain implementation (Yang et al , 2002; Valipour and Foster, 2010).…”

Section: Introductionmentioning

confidence: 99%

A multi-fiber approach with directional stiffness matrix in reinforced concrete structures

Yousefi

Esfahani

Tavakkolizadeh

2020

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Purpose This paper aims to develop a new multi-fiber element for predicting the structural behavior of planar-reinforced concrete (RC) members. Design/methodology/approach In this work, an exact multi-directional stiffness matrix is analytically derived based on the post-cracking bond-slip interaction between concrete and steel bars. The approach is also extended for large displacement analysis using Green–Lagrange finite strain tensor. In the proposed formulation, the weak form of governed differential equations is approximated by a trial-function expansion based on a finite strain-description and an additional degree of freedom for steel bars. Findings The findings provide a realistic description of cracking in the concrete structure. Numerical studies are conducted to examine the accuracy of the suggested approach and its capability to predict fairly complex responses of RC models. The findings prove that the proposed element can evaluate local and global responses of RC members, and it can be used as a reliable tool to reflect bond-slip effects in large displacement level. This leads to a robust and precise model for non-linear analysis of RC structures. Originality/value The methodology is capable of simulating coupled inelastic shear-flexural behavior of RC members through local stress field theory and Timoshenko beam model.

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A precise splice-length model for reinforced concrete structures

Rezaiee‐Pajand

Karimipour

Attari

2022

Proceedings of the Institution of Civil Engineers - Structures

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Various mathematical expressions have been proposed to evaluate or check the lapped length in spliced bars subjected to tension in reinforced concrete members. In this work, 284 tests on spliced bars were assessed in an attempt to improve the previous formulas, with the aim of proposing a new model to predict the lapped length, the transverse reinforcement spacing and the bond stress distribution in concrete beams with different compressive strengths. A genetic algorithm was used to optimise the proposed formulation. For both normal- and high-strength concrete, different bond-stress profiles were developed to predict the resistance provided by bonded embedment. The results clearly show that the proposed bond stress profiles lead to a more accurate evaluation of the lapped length in spliced bars than the expression proposed by the American Concrete Institute.

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New special finite elements for modeling reinforcement and steel‐concrete interface

Cited by 3 publications

References 3 publications

Statistically equivalent nonlinear finite element model for infilled R. C. framed systemsThe present work is an extension to the thesis of the first author for the Master of Science degree.

Statistically equivalent nonlinear finite element model for infilled R. C. framed systemsThe present work is an extension to the thesis of the first author for the Master of Science degree.

A multi-fiber approach with directional stiffness matrix in reinforced concrete structures

A precise splice-length model for reinforced concrete structures

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