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Reza Attarnejad

Bio: Reza Attarnejad is an academic researcher from University of Tehran. The author has contributed to research in topics: Finite element method & Beam (structure). The author has an hindex of 17, co-authored 67 publications receiving 1040 citations. Previous affiliations of Reza Attarnejad include University College of Engineering & University of Kashan.


Papers
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Journal ArticleDOI
TL;DR: In this article, the free vibration and stability analysis of axially functionally graded tapered Timoshenko beams is studied through a finite element approach, where exact shape functions for uniform homogeneous Timoshenko beam elements are used to formulate the proposed element.
Abstract: Free vibration and stability analysis of axially functionally graded tapered Timoshenko beams are studied through a finite element approach. The exact shape functions for uniform homogeneous Timoshenko beam elements are used to formulate the proposed element. The accuracy of the present element is considerably improved by considering the exact variations of cross-sectional profile and mechanical properties in the evaluation of the structural matrices. Carrying out several numerical examples, the convergence of the method is verified and the effects of taper ratio, elastic constraint, attached mass and the material non-homogeneity on the natural frequencies and critical buckling load are investigated.

253 citations

Journal ArticleDOI
TL;DR: In this paper, a beam element is proposed which takes advantage of the shape functions of homogeneous uniform beam elements, and the effects of varying cross-sectional dimensions and mechanical properties of the functionally graded material are included in the evaluation of structural matrices.
Abstract: Structural analysis of axially functionally graded tapered Euler-Bernoulli beams is studied using finiteelement method. A beam element is proposed which takes advantage of the shape functions of homogeneous uniform beam elements. The effects of varying cross-sectional dimensions and mechanical properties of the functionally graded material are included in the evaluation of structural matrices. This method could be used for beam elements with any distributions of mass density and modulus of elasticity with arbitrarily varying cross-sectional area. Assuming polynomial distributions of modulus of elasticity and mass density, the competency of the element is examined in stability analysis, free longitudinal vibration and free transverse vibration of double tapered beams with different boundary conditions and the convergence rate of the element is then investigated.

101 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of the nonlinear finite element (FE) method to evaluate the load carrying capacity and failure mode of simply supported castellated steel beams is discussed. And the numerical results indicate that the best accuracy associates with the adaptive neuro-fuzzy inference system and the neural network models provide better accuracy than the proposed equations.

77 citations

Journal ArticleDOI
TL;DR: In this paper, a novel method based on mechanical/structural principles is introduced for free vibration analysis of arbitrarily tapered Timoshenko beams in preference to primarily mathematically based methodologies.

60 citations

Journal ArticleDOI
TL;DR: In this paper, structural analysis of axially functionally graded tapered beams is studied from a mechanical point of view using a finite element method using the concept of basic displacement functions (BDFs).
Abstract: In this article, structural analysis of axially functionally graded tapered beams is studied from a mechanical point of view using a finite element method. Introducing the concept of basic displacement functions (BDFs), it is shown that exact shape functions could be explicitly obtained in terms of BDFs via application of basic principles of structural mechanics. BDFs are obtained using the unit-dummy-load method. Carrying out static analysis, it is verified that exact results are provided by applying one or a few elements. The competency of the present element in stability and free vibration analyses is verified through several numerical examples.

49 citations


Cited by
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Journal ArticleDOI

[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Book ChapterDOI
01 Jan 1997
TL;DR: This chapter introduces the finite element method (FEM) as a tool for solution of classical electromagnetic problems and discusses the main points in the application to electromagnetic design, including formulation and implementation.
Abstract: This chapter introduces the finite element method (FEM) as a tool for solution of classical electromagnetic problems. Although we discuss the main points in the application of the finite element method to electromagnetic design, including formulation and implementation, those who seek deeper understanding of the finite element method should consult some of the works listed in the bibliography section.

1,820 citations

BookDOI
26 Sep 2018

415 citations

01 Jan 2016
TL;DR: In this article, the seismic design of reinforced concrete and masonry buildings was downloaded from the Internet and it was found to be harmful for reading a good book with a cup of coffee in the afternoon.
Abstract: Thank you very much for downloading seismic design of reinforced concrete and masonry buildings. As you may know, people have look hundreds times for their chosen novels like this seismic design of reinforced concrete and masonry buildings, but end up in harmful downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they cope with some infectious virus inside their laptop.

345 citations

Journal ArticleDOI
TL;DR: In this article, the vibration response of non-homogenous and non-uniform microbeams is investigated in conjunction with Bernoulli-Euler beam and modified couple stress theory, where boundary conditions of the microbeam are considered as fixed at one end and free at the other end.

321 citations