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Dissertation
Travail de Fin d'Etudes : Contribution to the implementation of robustness in European design recommendations for steel and composite structures
Authors: --- --- --- ---
Year: 2020 Publisher: Liège Université de Liège (ULiège)

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Abstract

At present, Eurocode 1 Part 1-7 presents different strategies to deal with the problem of robustness. However, for each of these strategies, the content is limited to the statement of general principles. Consequently, in recent years, several researches have been carried out to develop calculation and design tools for robustness. Thanks to these researches, many new tools and works are available to practitioners, but the lack of comprehensive approaches limits their scope and use.

In this work, approaches for handling the robustness problem in steel and composite structures are developed for the strategies presented in the Eurocode, and based on the tools currently available. For each of the approaches developed, the tools it requires to use, the limitations it presents and the analysis and verification steps to be followed are presented in detail. In addition, all this information is summarized in a global flowchart proposed to deal with the robustness problem.

This first task highlights several inconsistencies concerning the prescriptive tying method currently proposed by the Eurocode. Proposals for improvements have actually already been made recently.

Therefore, in a second step, this thesis focuses more specifically on this tying method. To assess the relevance of the rules currently proposed by the Eurocode regarding the tying method and the degree of robustness which these rules allow to reach, a study of a braced structure undergoing the loss of a column is carried out. In the context of this study, the beam-column joints of the structure first have the resistance specified by the tying method. Subsequently, different joint configurations are studied. By comparing the results obtained, several conclusions are drawn about the tying method. Also, this study shows that simple joints such as header plate connections have a too low degree of robustness, and that it is more advantageous to use semi-rigid/rigid joints such as flush end-plate connections.


Dissertation
Robustness of steel structures - study of the applicability of innovative methods on real structures
Authors: --- --- --- --- --- et al.
Year: 2021 Publisher: Liège Université de Liège (ULiège)

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Abstract

The request for robustness of structures is a recent topic aiming at ensuring the structural integrity of a structure in case of exceptional events. General design recommendations are provided in modern codes and standards but they are far from being satisfactory as it has been demonstrated that the respect of these recommendations do not necessarily allow to guarantee a sufficient robustness to a structure. It is the reason why research activities are still ongoing in this field in view of (i) mastering the response of structures when subjected to exceptional events and, on this basis, (ii) to derive rules for practitioners. This master thesis takes place in this context.

The objective of this master thesis is to study and apply methods for steel building structures allowing to reach an appropriate level of robustness. These research will be performed in the framework of an ongoing European RFCS project entitled "FailNoMore". 

In particular, a 3D steel structures, initially designed by a German design office for “classical” loading conditions, will be studied in view of (i) characterising its behaviour when subjected to a specific exceptional event, i.e. the loss of a supporting member, and of (ii) investigating the efficiency of existing design methods for robustness. At the end of the work, a critical analysis of the results obtained with the different methods will be provided in view of making recommendations for practice. 

These objectives will be achieved using numerical and analytical approaches. The numerical investigations will be realised using the FINELG software. 

This master thesis will show that the tying method, such as it is present in the Eurocode, does not make it possible to ensure a sufficient robustness in the case of the scenario considered of the loss of a column.
It is also shown that, following a numerical study, the weakness of the structure is in the connections. A structure with hinged connections is not robust when column loss is considered.
By using partially resistant connections, and by means of an innovative analytical approach, it is shown that the considered structure can be robust under the exceptional scenario of column loss by slightly modifying the properties of the structure.

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