Joanna Nseir

Joanna Nseir
University of Applied Sciences Fribourg, Switzerland

Doctor of Engineering
Associate Professor, Haute Ecole d'ingénieurs et d'architectes de Fribourg

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26
Publications
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112
Citations

Publications

Publications (26)
Preprint
Full-text available
We extend the problem of finding an optimal structure with maximum load-bearing capacity to the case of multiple materials. We first consider a reinforcement optimization case where the structure consists of a fixed background matrix material with given strength properties and optimize the reinforcement topology within this material. We discuss the...
Article
Full-text available
The present work addresses the problem of maximizing a structure load-bearing capacity subject to given material strength properties and a material volume constraint. This problem can be viewed as an extension to limit analysis problems which consist in finding the maximum load capacity for a fixed geometry. We show that it is also closely linked t...
Article
The present paper focuses on the rotational capacity of H.S.S. steel sections; in particular, the influence of local buckling is accounted for by means of a new generalized cross-sectional slenderness parameter, which is used to characterize the cross-sectional rotational capacity, and, by extension, the available deformation capacity. Careful shel...
Article
The present paper focuses on a new, alternative design philosophy: the Overall Interaction Concept (O.I.C.). This concept, based on the well-established resistance-instability interaction and the definition of a generalised relative slenderness, was thought and built to i) improve actual design practice, ii) increase accuracy, iii) advance simplici...
Article
This paper presents a series of twelve buckling tests on rectangular and circular hollow section beam-column of nominal steel grade S355. The columns were fabricated by either the hot-rolling or the cold-forming process, and were subjected to different load cases through the application of eccentric compression: mono-axial bending (My) or bi-axial...
Article
Present paper details bending tests on rectangular hollow sections (RHS) and square hollow sections (SHS). The tests primarily aimed at providing data on ultimate load carrying capacities as well as rotations and curvatures in the inelastic range at plastic hinges locations. These bending tests were designed to investigate reserve capacities and pl...
Article
The present paper investigates the cross-sectional resistance of cold-formed tubes; in particular, attention is paid to the influence of various material laws on the carrying capacity. Owing to the fabrication process, coupons from cold-formed tubes usually exhibit a rounded stress-strain relationship, whose shape is known to be influenced by many...
Article
The present paper focuses on the rotational capacity of H-shaped steel sections; in particular, the influence of local buckling is accounted for by means of a generalized cross-sectional slenderness, which is used as a new parameter to characterize the cross-sectional rotational capacity, and, by extension, the available deformation capacity. Caref...
Conference Paper
This paper deals with the application of the Overall Interaction Concept (O.I.C.) to the practical design of hollow structural shapes. More precisely, the concern here is to demonstrate the ability of the O.I.C. to accurately account for the influence of local buckling on the cross-sectional carrying capacity. In this respect, detailed investigatio...
Conference Paper
With the introduction of the Eurocodes, a new design philosophy for the design of cylindrical shells against buckling was made available to structural engineers in Europe: the "Overall Method", which makes use of the so-called "Overall Slenderness" of the shell to determine the appropriate (local) buckling reduction factor. There is a certain simil...
Conference Paper
Hot-rolled structural steel hollow sections typically display largely homogeneous material properties around the cross-section with low residual stresses, due to the uniform cooling pattern associated with the production of uniform sections of constant thickness. This leads to a stress-strain response with a clearly defined yield stress and an exte...
Conference Paper
This paper reports the results of an analytical, numerical and experimental investigation dealing with I-section steel members acted by a combination of major-axis bending and axial ("beams subjected to tension"), which is relatively rare in practice and, therefore, has received little attention in the past. In particular, there are no guidelines f...
Conference Paper
The Overall Interaction Concept (O.I.C.) stands as a new design approach that aims at a straightforward design check of the stability and resistance of steel members. It was developed in response to the expansion of high strength steel products, where instability has more influence and deserves specific attention, especially at the cross-sectional...
Article
The behaviour of so-called 'cellular members' against lateral torsional buckling is investigated. These beams comprise regularly spaced web openings, and are especially used for their high resistance-to-weight ratio, the possibility of integrating service pipes within their height, and for aesthetic reasons. Such profiles usually exhibit a complex...
Conference Paper
Full-text available
Present paper deals with the behavior of so-called cellular members against lateral torsional buckling. These beams comprising regularly-spaced web openings are especially used for their high resistance-weight ratio, the possibility to integrate service pipes within their height, and aesthetics. Such profiles usually exhibit a complex behavior, sin...

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Project (1)
Project
Dear Colleagues, I invite you to submit an abstract to the Symposium Risk analysis and Safety of Technical Systems organized by Technical Committee 12 “Risk analysis and Safety of Large Structures and Components (RAS TC 12)” of the European Structural Integrity Society within the framework of the 22nd European Conference on Fracture - ECF22 to be held in Belgrade, Serbia, 26-31 August 2018 (see http://www.ecf22.rs/). The deadline for the abstracts is 31 January 2018. This Symposium is intended to be a forum of discussion of the recent advances in maintenance, safety, risk analysis, management and life-cycle performance of a wide range of infrastructures, such as, engineering technical systems, bridges, buildings, dams, railways, underground constructions, wind and transmission towers, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, airplanes and other types of structures including aerospace and automotive structures are considered. It is expected contributions from engineers, metallurgists, material scientists, among others, allowing a very multidisciplinary discussion. All contributions in the form of extended abstracts will be peer reviewed by the members of ESIS TC12 Technical Committee. A selection of papers presented at this Symposium will be published in a Special Issue on associated ESIS journals (International Journal of Fatigue, Engineering Failure Analysis, Engineering Fracture Mechanics, Theoretical and Applied Fracture Mechanics). The ESIS technical committee “TC12 - Risk Analysis and Safety of Large Structures and Components” supports the Minisymposium. The annual meeting of the TC12 will be performed during the conference event. IMPORTANT: 1) When submitting your abstract please mention the name of Symposium - “Risk analysis and Safety of Technical Systems”. 2) Please inform us about your submission/intention to submit so that we could plan Symposium’s sessions (jacorreia@inegi.up.pt) With best regards, José Correia, Vladimir Moskvichev and Aleksandar Sedmak ESIS TC12 Chairs