References of "Coméliau, Ludivine"
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See detailRobustness of steel and composite buildings suffering the dynamic loss of a column
Coméliau, Ludivine ULg; Rossi, Barbara ULg; Demonceau, Jean-François ULg

in Structural Engineering International (2012), 22(3), 323-329

In case a vehicle impacts a building frame, one or several columns may be damaged or even completely destroyed. Nowadays, it is a concern to mitigate the risk of progressive collapse of the whole ... [more ▼]

In case a vehicle impacts a building frame, one or several columns may be damaged or even completely destroyed. Nowadays, it is a concern to mitigate the risk of progressive collapse of the whole structure further to such a localised exceptional event. Although this robustness requirement is part of several design codes, very few precise practical guidelines are provided, especially as far as dynamic failures are concerned. The present research focuses on building frames suffering the loss of one internal column. The dynamic response is more specifically investigated, with the aim to understand this behaviour in order to eventually derive simplified procedures for robustness assessment. This paper first briefly presents the main previous achievements related to the prediction of the static response of a plane frame suffering a column loss. The investigations into the dynamic behaviour are then summarised, which constitutes the core topic of the paper. For sake of simplicity, the dynamic response is described using a basic substructure that was proved to show many similarities in behaviour with a global frame losing a column. A simplified model is finally developed for the prediction of the considered system dynamic response. [less ▲]

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See detailRobustness of car parks against localised fire - Deliverable II: Experimental tests and development of sophisticated behavioural models
Haremza, Cécile; Santiago, Aldina; Simões da Silva, Luís et al

Report (2012)

Grant Agreement Number RFSR-CT-2008-00036

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See detailRobustness of car parks against localised fire - Deliverable VI: Development of design recommendations, critical appraisal and application to a study case
Fang, Cheng; Izzuddin, Bassam; Elghazouli, Ahmed et al

Report (2012)

Grant Agreement Number RFSR‐CT‐2008‐00036

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See detailRobustness of car parks against localised fire - Deliverable III: Development of simplified behavioural models
Haremza, Cécile; Santiago, Aldina; Simões da Silva, Luís et al

Report (2012)

Grant Agreement Number RFSR-CT-2008-00036

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See detailRobustness of car parks against localised fire - Draft Final Report
Demonceau, Jean-François ULg; Huvelle, Clara ULg; Coméliau, Ludivine ULg et al

Report (2012)

Research Programme of the Research Fund for Coal and Steel Steel RTD Project carried out with a financial grant of the Research Programme of the Research Fund for Coal and Steel

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See detailInnovative bolted beam-to-column joints for seismic resistant building frames
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Dubina, Dan; Grecea, Daniel (Eds.) CONNECTIONS VII proceedings (2012)

In the present paper, innovative joint configurations leading to more economical solutions for full-strength beam-to-column joints for seismic building frames are detailed. The specificities of these ... [more ▼]

In the present paper, innovative joint configurations leading to more economical solutions for full-strength beam-to-column joints for seismic building frames are detailed. The specificities of these joints are due to the fact that (i) the column is made of high strength steel while the beam are made of mild carbon steel and (ii) the design of some components allows partially neglecting the overstrength factor. Also, methods for the characterisation of specific joint components not directly covered by the Eurocode recommendations are proposed. [less ▲]

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See detailRobustness of car parks against localised fire - Deliverable V: Practical behavioural models for car park structures towards design practice
Fang, Cheng; Izzuddin, Bassam; Elghazouli, Ahmed et al

Report (2012)

Research Programme of the Research Fund for Coal and Steel - Steel RTD Project carried out with a financial grant of the Research Programme of the Research Fund for Coal and Steel - Grant Agreement Number ... [more ▼]

Research Programme of the Research Fund for Coal and Steel - Steel RTD Project carried out with a financial grant of the Research Programme of the Research Fund for Coal and Steel - Grant Agreement Number RFSR‐CT‐2008‐00036 [less ▲]

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See detailRobustness of car parks against localised fire - Deliverable IV: Development of FEM model for car parks under localised fire
Fang, Cheng; Izzuddin, Bassam; Elghazouli, Ahmed et al

Report (2012)

Research Programme of the Research Fund for Coal and Steel - Steel RTD Project carried out with a financial grant of the Research Programme of the Research Fund for Coal and Steel - Grant Agreement Number ... [more ▼]

Research Programme of the Research Fund for Coal and Steel - Steel RTD Project carried out with a financial grant of the Research Programme of the Research Fund for Coal and Steel - Grant Agreement Number RFSR‐CT‐2008‐00036 [less ▲]

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See detailROBUSTNESS OF BUILDING STRUCTURES - Recent developments and adopted strategy
Demonceau, Jean-François ULg; Coméliau, Ludivine ULg; Jaspart, Jean-Pierre ULg

in Eurosteel 2011 - 6th European Conference on Steel and Composite Structures - Proceedings (2011, September)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most cases, no precise practical guidelines on how to achieve this goal are provided. At the University of Liège, the robustness of building frames is investigated following the so-called “alternative load path method”, with the final objective to propose design requirements to mitigate the risk of progressive collapse considering the conventional scenario “loss of a column” further to an unspecified event. In particular, a complete analytical procedure has been developed for the verification of the robustness of steel or composite plane frames. For sake of simplicity, these first works have been based on the assumption that the dynamic effects linked to the column loss were limited and could therefore be neglected. More recently, complementary works have been carried out with the objective to address the dynamic effects. Besides, the extension of the static procedure to actual 3D frames is under investigation in Liège. The present paper gives a global overview of the ongoing researches in the field of robustness at the University of Liège and, in particular, the global strategy aiming at deriving design requirements is detailed. [less ▲]

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See detailRobustness of building frames further to a column loss - Substructure approach with account of dynamic effects
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in EUROSTEEL 2011 - 6th European Conference on Steel and Composite Structures - Proceedings (2011, September)

Nowadays, it is a concern to mitigate the risk of progressive collapse of a whole structure further to exceptional events such as explosions, impacts, fire... Different general approaches are proposed in ... [more ▼]

Nowadays, it is a concern to mitigate the risk of progressive collapse of a whole structure further to exceptional events such as explosions, impacts, fire... Different general approaches are proposed in the Eurocodes and some other national design codes to ensure the robustness of structures, although very few practical guidelines are provided. In the present study, the so-called “alternative load path method” is followed and the conventional scenario “loss of a column” is considered. Investigations were conducted at the University of Liège in the last few years regarding the static behaviour of two-dimensional building frames suffering the loss of a column further to an unspecified accidental event. They resulted in the development of simplified analytical methods for the prediction of the structural response assuming a static behaviour. In particular, it was shown that a substructure composed of the double-beam overhanging directly the lost column and its beam-to-column joints is able to reproduce the response of a 2D frame when membrane forces develop in the beams after the formation of the global beam plastic mechanism induced by the column loss. The dynamic behaviour of such a substructure was more recently investigated. As a result, a simplified approach was developed for the prediction of the maximal displacement of the system and subsequently the internal forces developing in the substructure, permitting the definition of ductility and resistance requirements for robustness. In the present paper, the whole analytical procedure is applied to a particular substructure. First, the static response is determined. Then the proposed model is used to predict the dynamic behaviour of the substructure as a function of the load initially supported by the failing column and the duration of its removal. In this paper, analytical approaches developed at the University of Liège are applied to predict the response of the considered substructure and the results are compared to numerical simulations; but the development of these methods and the observed phenomena are not detailed. [less ▲]

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See detailNon-dissipative joints in seismic resistant building frames - Bolted beam-to-column joints
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in EUROSTEEL 2011 - 6th European Conference on Steel and Composite Structures - Proceedings (2011, September)

According to Eurocode 8, earthquake resistant steel building frames shall be designed following either the “low dissipative structural behaviour concept” or the “dissipative structural behaviour concept” ... [more ▼]

According to Eurocode 8, earthquake resistant steel building frames shall be designed following either the “low dissipative structural behaviour concept” or the “dissipative structural behaviour concept”. In the second concept, the capability of parts of the structure to resist earthquake actions through inelastic behaviour is taken into account: energy is dissipated in plastic mechanisms. In such a design, it has to be ensured that the dissipative zones form where they are intended to and that they yield before other zones leave the elastic range. In particular, moment resisting frames are designed in such a way that plastic hinges develop at the extremities of the beams. These dissipative zones can be located either in the beams or in the beam-to-column joints. In this paper, non-dissipative bolted beam-to-column connections are considered. They must be sufficiently resistant to remain in elastic range while cyclic yielding develops in the dissipative zones located in the beams. Besides, the possibility that the actual yield strength of the beam is higher than the nominal value has to be taken into account by a material overstrength factor. Such an approach generally leads to very strong and thus expensive joints. In the present paper, a design strategy leading to more economical solutions for full-strength beam-to-column joints is detailed. This study was conducted within the framework of an RFCS project called HSS-SERF (High Strength Steel in Seismic Resistant Building Frames). The considered moment-resisting joints are part of seismic resistant building frames made of high strength steel composite columns and mild carbon steel beams. The columns are either partially-encased wide-flange columns (H columns) or concrete-filled rectangular hollow-section columns (RHS columns). The proposed joint configuration uses hammer-heads extracted from the beam profile. To fulfil the resistance requirement taking account of the possible overstrength of the beam, the resistant moment of the joint is decomposed in the contributions of the different components involved. Then, no overstrength factor needs to be considered for the components related to the beam itself and to the hammer-heads. This approach is in full accordance with the basic principles of Eurocode 8 and can decrease much the required resistance of the joints provided some conditions are fulfilled, meaning lower costs. [less ▲]

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See detailRobustness of steel and composite building structures
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg; Coméliau, Ludivine ULg

in 7th National conference on steel structures proceedings (2011, September)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most cases, no precise practical guidelines on how to achieve this goal are provided. At Liège University, the robustness of building frames is investigated with the final objective to propose design requirements to mitigate the risk of progressive collapse considering the conventional scenario “loss of a column” further to an unspecified event. In particular, a complete analytical procedure has been developed for the verification of the robustness of steel or composite plane frames. For sake of simplicity, these first works have been based on the assumption that the dynamic effects linked to the column loss were limited and could therefore be neglected. More recently, complementary works have been carried out with the objective to address the dynamic effects. Besides, the extension of the static procedure to actual 3D frames is under investigation in Liège. The present paper gives a global overview of the ongoing researches in the field of robustness at Liège University and, in particular, the global strategy aiming at deriving design requirements is detailed. [less ▲]

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See detailRobustness of building structures - recent developments and adopted strategy
Demonceau, Jean-François ULg; Coméliau, Ludivine ULg; Jaspart, Jean-Pierre ULg

in Steel Construction (2011), 4/2011

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most cases, no precise practical guidelines on how to achieve this goal are provided. At the University of Liège, the robustness of building frames is investigated following the so-called “alternative load path method”, with the final objective to propose design requirements to mitigate the risk of progressive collapse considering the conventional scenario “loss of a column” further to an unspecified event. In particular, a complete analytical procedure has been developed for the verification of the robustness of steel or composite plane frames. For sake of simplicity, these first works have been based on the assumption that the dynamic effects linked to the column loss were limited and could therefore be neglected. More recently, complementary works have been carried out with the objective to address the dynamic effects. Besides, the extension of the static procedure to actual 3D frames is under investigation in Liège. The present paper gives a global overview of the ongoing researches in the field of robustness at the University of Liège and, in particular, the global strategy aiming at deriving design requirements is detailed. [less ▲]

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See detailRobustness of steel structures - Exercise: Application of different robustness approaches to a frame building structure
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Learning material (2011)

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at ... [more ▼]

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at a corner of two roadways and thus the perimeter columns adjacent to these roads are likely to be impacted by a car or a lorry. Besides, the ground floor is a parking area (accessible to cars only) so that any internal column could also be damaged. The different approaches proposed in the Eurocodes will be applied and discussed. These methods consist for example in increasing the column resistance in such a way they can resist the impact or designing the structure so that it remains globally stable despite the loss of the damaged column. However, in such a case, a static removal of the column will be assumed (for sake of simplicity, no dynamic effect due to the failure of the column will be taken into account in this exercise). [less ▲]

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See detailRobustness of steel structures - Exercise SOLUTION: Application of different robustness approaches to a frame building structure
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Learning material (2011)

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at ... [more ▼]

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at a corner of two roadways and thus the perimeter columns adjacent to these roads are likely to be impacted by a car or a lorry. Besides, the ground floor is a parking area (accessible to cars only) so that any internal column could also be damaged. The different approaches proposed in the Eurocodes will be applied and discussed. These methods consist for example in increasing the column resistance in such a way they can resist the impact or designing the structure so that it remains globally stable despite the loss of the damaged column. However, in such a case, a static removal of the column will be assumed (for sake of simplicity, no dynamic effect due to the failure of the column will be taken into account in this exercise). [less ▲]

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See detailRobustness of steel structures - Homework: Application of different robustness approaches to a frame building structure
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Learning material (2011)

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at ... [more ▼]

The aim of this exercise is to investigate different ways of ensuring the robustness of a frame building structure considering a vehicle impact on a column of the ground floor. The building is located at a corner of two roadways and thus the perimeter columns adjacent to these roads are likely to be impacted by a car or a lorry. Besides, the ground floor is a parking area (accessible to cars only) so that any internal column could also be damaged. The different approaches proposed in the Eurocodes will be applied and discussed. These methods consist for example in increasing the column resistance in such a way they can resist the impact or designing the structure so that it remains globally stable despite the loss of the damaged column. However, in such a case, a static removal of the column will be assumed (for sake of simplicity, no dynamic effect due to the failure of the column will be taken into account in this exercise). [less ▲]

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See detailRobustness of steel and composite building structures
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg; Coméliau, Ludivine ULg

in 7th National conference on steel structures (2011)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most cases, no precise practical guidelines on how to achieve this goal are provided. At Liège University, the robustness of building frames is investigated with the final objective to propose design requirements to mitigate the risk of progressive collapse considering the conventional scenario “loss of a column” further to an unspecified event. In particular, a complete analytical procedure has been developed for the verification of the robustness of steel or composite plane frames. For sake of simplicity, these first works have been based on the assumption that the dynamic effects linked to the column loss were limited and could therefore be neglected. More recently, complementary works have been carried out with the objective to address the dynamic effects. Besides, the extension of the static procedure to actual 3D frames is under investigation in Liège. The present paper gives a global overview of the ongoing researches in the field of robustness at Liège University and, in particular, the global strategy aiming at deriving design requirements is detailed. [less ▲]

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See detailRobustness of steel and composite buildings under impact loading
Coméliau, Ludivine ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Batista, E.; Vellasco, P.; de Lima, L. (Eds.) Proceedings of the SDSS'Rio 2010 conference (2010, September)

In case of a vehicle impact against a building frame, one or more columns may be damaged or even fully destroyed. In such an exceptional event, the risk of progressive collapse of the whole structure has ... [more ▼]

In case of a vehicle impact against a building frame, one or more columns may be damaged or even fully destroyed. In such an exceptional event, the risk of progressive collapse of the whole structure has to be mitigated. Several approaches potentially exist to face this problem. In the present study, the so-called alternative load path method is followed. In two recent PhD studies at Liège University, a complete analytical procedure was developed permitting the prediction of the structural response of steel or composite plane frames further to the loss of a column. For sake of simplicity, these first works were based on the assumption of static behaviour. More recently, complementary research was carried out with the objective to address the dynamic effects. As a result, an original procedure for the appraisal of the structural robustness of plane building frames was proposed. The present paper presents this work. [less ▲]

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See detailNew simplified analytical method for the Prediction of global stability of steel and composite sway frames
Demonceau, Jean-François ULg; Ly, Dong Phuong Lam ULg; Coméliau, Ludivine ULg et al

in Proceedings of the annaual stability conference, 2010 (2010, May)

Eurocode 4 is the European design code for composite construction; in its so-called EN 1994-1-1 version, the design of “non-sway buildings” is mainly covered. As a result, EC4 focuses on the check of ... [more ▼]

Eurocode 4 is the European design code for composite construction; in its so-called EN 1994-1-1 version, the design of “non-sway buildings” is mainly covered. As a result, EC4 focuses on the check of structural elements like beams, columns, slabs and joints. However, in the last years, the construction of taller buildings and larger industrial halls without wind bracing systems tends to make global instability a relevant failure mode, which is not well covered by Eurocode 4. Recently, intensive experimental, numerical and theoretical investigations have been carried out at Liège University. The latter aimed at improving the knowledge in the field of sway composite building frames and at developing appropriate design rules. The rotational behavior of the beam-to-column composite joints is one of the key aspects of the problem to which a special attention has been paid. This paper reflects investigations carried out at Liege University on this topic. In particular, an innovative simplified analytical method to predict the ultimate loading factor and the associated collapse mode of both steel and composite frames subjected to static loadings is presented. [less ▲]

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See detailEffets du comportement dynamique des structures de bâtiments en acier suite à la ruine accidentelle de l'une des colonnes portantes
Coméliau, Ludivine ULg

Master's dissertation (2009)

Since the Ronan Point tower partially collapsed in London in 1968, design codes of several countries of Western Europe and North America include notions of progressive collapse and robustness. Rules in ... [more ▼]

Since the Ronan Point tower partially collapsed in London in 1968, design codes of several countries of Western Europe and North America include notions of progressive collapse and robustness. Rules in this domain are intended to ensure the global integrity of structures suffering exceptional actions, and thus to avoid that a local damage associated with an extreme loading event leads to the collapse of the whole building or of a great part of it. Particularly, Eurocode 1 demands that structures be designed and built so that they wouldn’t suffer disproportionate damage compared with the initial cause : explosion, impact or consequences of human mistakes. Unfortunately, few researches have been undertaken in the domain of robustness so far, aiming to provide engineers with design strategies relatively simple in use. However, investigations have been recently conducted at ULg regarding the behaviour of building frames with several bays and storeys suffering the loss of a column further to an unspecified accidental event. The loss of a column implies redistributions of forces into the structure and the development of alternative load paths which were initially unforeseen but could lead to a final stable state provided some favourable conditions are fulfilled. These studies resulted in the development of simplified analytical methods permitting the prediction of the structural response assuming static behaviour. This hypothesis can be justified in some circumstances, for instance when the destruction of the column is associated with the very progressive diminution of the material mechanical characteristics under the effects of a localised fire. It isn’t yet valid in case of dynamic actions such as impacts or explosions. In parallel with the researches conducted at ULg, investigations were carried out at London Imperial College considering the instantaneous loss of a column and taking the associated dynamics effects into account. Amongst other things, a procedure was developed providing the maximum displacement resulting from the sudden loss of a column on the basis of the only knowledge of the static response. The present work aims to go further into the knowledge of the dynamic behaviour of building frames suffering the loss of a column. To achieve this goal, the ruin scenario considered will still be the loss of a column but it will be neither static nor instantaneous any more. Instead, the ruin will be considered taking some variable time. In particular, the influence of the latter on the structural response will be highlighted. First, the dynamic behaviour of an elementary substructure will be studied in detail. The time evolution of the displacement, the internal forces and the plastification will be described. Then, the response of a global frame further to the loss of a column will be investigated. Eventually, on the basis of the substructure, the dynamic amplification will be attempted to quantify as a function of non-dimensional parameters characterising the system geometrical and mechanical properties. [less ▲]

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