References of "Jaspart, Jean-Pierre"
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See detailNew simplified analytical method for the prediction of global stability of composite sway frames
Ly, Dong Phuong Lam ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in EUROSTEEL 2008, 5th European Conference on Steel and Composite Structures (2008, September)

In the last years, the construction of taller composite buildings and larger composite industrial halls without wind bracing systems is susceptible to make global instability a relevant failure mode. This ... [more ▼]

In the last years, the construction of taller composite buildings and larger composite industrial halls without wind bracing systems is susceptible to make global instability a relevant failure mode. This one is not yet covered by EC4 [2]. This paper reflects investigations carried out of Liege University on this topic. In particular, an innovative simplified analytical method to predict the ultimate loading factor and the associated collapse mode of composite frames is derived. [less ▲]

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See detailEffect of end connection restraints on the stability of steel beams in bending
Amara, S.; Kerdal, D. E.; Jaspart, Jean-Pierre ULg

in Advanced Steel Construction (2008)

The influence of the end restraint conditions on the lateral-torsional buckling of beams is investigated in detail using finite element method. The paper focuses on the limitation of Eurocode 3 regarding ... [more ▼]

The influence of the end restraint conditions on the lateral-torsional buckling of beams is investigated in detail using finite element method. The paper focuses on the limitation of Eurocode 3 regarding the lateral bending and torsional restraint coefficients kz and kθ of the end supports. Theoretical expressions of the coefficients kz and kθ taking into account the minor axis flexural restraint at the support and the end torsional restraint respectively are presented. The introduction of new coefficients zk and kθ representing the actual support conditions in the expression of the elastic critical moment is suggested. A comparison between the elastic critical moments for various beam cross-sections, lengths and various end restraints, obtained from the finite-element method, and those derived from EC3 ENV method, in which the proposed coefficients zk and kθ are introduced, confirms the reliability of these coefficients that model the end support conditions. [less ▲]

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See detailRecent developments on composite connections: behaviour of joints subjected to sagging bending moments and presentation of a free design dedicated software
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg; Klinkhammer, Ralf et al

in EUROSTEEL 2008, 5th European Conference on Steel and Composite Structures (2008, September)

In Eurocode 4, design rules are suggested for the evaluation of the mechanical properties of structural steel-concrete composite joints (rotational stiffness, resistance and ductility). These rules cover ... [more ▼]

In Eurocode 4, design rules are suggested for the evaluation of the mechanical properties of structural steel-concrete composite joints (rotational stiffness, resistance and ductility). These rules cover situations where the joints are subjected to moments and shear forces, but in hogging regions only. Recently, researches have been conducted on the behaviour of composite joints subjected to sagging bending moments and to combined bending moments and axial loads, types of loadings which appear in composite frame further to a column loss. In the present paper, recent developments allowing to extend the EC4 design rules to joints in sagging regions (loading which can occur, for instance, in sway composite frames) are presented and the proposed method is validated through comparisons with experimental test results. Also, an easy-to-apply design software (which will be freely available), applying the rules recommended in Eurocode 4 in a safe and easy way, is described. [less ▲]

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See detailGlobal structural behaviour of a building frame further to its partial destruction by column loss
Luu, Nguyen Nam Hai; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Ofner, Robert; Beg, Darko; Fink, Josef (Eds.) et al EUROSTEEL 2008, 5th European Conference on Steel and Composite Structures (2008, September)

In 1969, a catastrophic event occurred in UK at the Ronal Point residential building where the progressive collapse of the building, initiated by a localized gas explosion, was observed. Further to this ... [more ▼]

In 1969, a catastrophic event occurred in UK at the Ronal Point residential building where the progressive collapse of the building, initiated by a localized gas explosion, was observed. Further to this event, some codes and standards, and in particular the British Standards, impose to the designer to ensure the structural integrity of building in order to avoid the progressive collapse of the latter further to an exceptional action. In fact, the progressive collapse of a building is the result of a change in the structural system and of the load path associated to the loss of one or more main structural members. In other words, the existing load path is suddenly modified and the loads supported by the building are reported to the foundation through an alternative load path. Accordingly, the remaining structural members are overloaded by additional loads; the latter have to be able to support these loads and to possess a sufficient ductility. In the last decade, researches on this topic were initiated at the Argenco Department of Liège University. The present paper reflects part of these activities; in particular, some investigations dedicated to the investigation of the behaviour of a frame further to a column loss are presented. In another article presented by J.F Demonceau, H.N.N. Luu and J.P Jaspart within the present conference is devoted to the investigation of the behaviour of the frame when significant membranar forces developed within the structure. In particular, in this paper, a simplified substructure which is able to simulate the behaviour of a structure further to a column loss is defined. The present paper presents the analytical methods requested to define the parameters influencing the response of the simplified substructure. [less ▲]

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See detailDevelopment of membranar effects in frame beams: experimental and analytical investigations
Demonceau, Jean-François ULg; Luu, Nguyen Nam Hai; Jaspart, Jean-Pierre ULg

in EUROSTEEL 2008, 5th European Conference on Steel and Composite Structures (2008, September)

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

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. According to Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most of the cases, no precise practical guidelines on how to achieve this goal are provided. A European RFCS project called “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines allowing to ensure the structural integrity of steel and composite structures under exceptional event through an appropriate robustness. The investigations performed at Liège University, as part of this European project, are mainly dedicated to the exceptional event “Loss of a column in a steel or steel-concrete composite building frame”; the main objective is to develop a simplified analytical procedure to predict the frame response further to a column loss. The development of this simplified procedure is detailed in two complementary PhD theses: the thesis of J.-F. Demonceau and the thesis of H.N.N. Luu. The present paper describes experimental and analytical studies carried out within the first PhD thesis. In particular, a simplified analytical method allowing the prediction of the frame response with account of the membranar effects is described. [less ▲]

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See detailComposite joints in robust building frames
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

(2008, July)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional actions. Accordingly, a European RFCS ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional actions. Accordingly, a European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines for the design of steel and composite structures under exceptional actions. In this project, the importance of the structural joints has been shown; as a particular case, these ones experience additional high tying forces after the loss of a column, as a result of the development of membrane forces in the beams located just above the damaged column. Moreover a reversal of moments occurs in some joints. In this paper design models for the evaluation of the mechanical properties of joints in such extreme situations are presented. References are made to recent tests on joints in isolation and joints in frames recently achieved at Stuttgart and at Liège University in the framework of the above-mentioned RFCS project. [less ▲]

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See detailRobustness of structures - behaviour of composite joints
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Sixth International Workshop on Connections in Steel Structures (2008, June 23)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading. Accordingly, a European RFCS ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading. Accordingly, a European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines to ensure the structural integrity of steel and composite structures under exceptional loading through an appropriate robustness. In this project, the importance of the structural joints has been shown; indeed, these ones experience additional high tying forces after the loss of a column, as a result of the development of membrane forces in the beams located just above the damaged column. Moreover a reversal of moments occurs in some joints. In this paper design models for the evaluation of the mechanical properties of joints in such extreme situations are presented. References are made to recent tests on joints in isolation recently achieved in the framework of the above-mentioned RFCS project. [less ▲]

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See detailPlastic capacity of semi-compact steel sections
Lechner, A.; Kettler, M.; Greiner, R. et al

in Proceedings of the CIMS2008 - Coupled Instabilities in Metal Structures (2008, June)

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See detailDuctility requirements for the design of bolted shear connections
Henriques, José; Jaspart, Jean-Pierre ULg; Piraprez, E.

in Proceedings of the Sixth International Workshop on Connections (2008, June)

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See detailIron columns reinforced by FRP under axial compression
Ly, Dong Phuong Lam ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

Report (2008)

Slender iron column reinforced by FRP is sensitive to buckling phenomenon, taking place obviously at a cross-section within the middle segment. An equivalent FRP-iron cross-section can be used to derive ... [more ▼]

Slender iron column reinforced by FRP is sensitive to buckling phenomenon, taking place obviously at a cross-section within the middle segment. An equivalent FRP-iron cross-section can be used to derive the buckling resistance of the composite member by using buckling formulation previously defined for column members. [less ▲]

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See detailIron and FRP materials
Ly, Dong Phuong Lam ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Report (2008)

Numerical investigations are very helpful to prepare and to plan experimental investigations. The numerical investigations presented within the present section deals with the experimental tests conducted ... [more ▼]

Numerical investigations are very helpful to prepare and to plan experimental investigations. The numerical investigations presented within the present section deals with the experimental tests conducted on iron elements reinforced by FRP in tension, i.e.: - first, to determine the anchorage length requested for the FRP (zone A of the figure 1.1 1) to insure a good stress transfer from the iron member to FRP sheets through bonds without any debonding problem; - and secondly, to predict the effects of FRP sheets on iron elements in tension. [less ▲]

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See detailDevelopment of design rules for iron columns reinforced by FRP
Ly, Dong Phuong Lam ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Report (2008)

In the available literature, some techniques of reinforcement are proposed: reinforcement with the use of cables, replacement of damage elements, creation of a composite action by connecting the damage ... [more ▼]

In the available literature, some techniques of reinforcement are proposed: reinforcement with the use of cables, replacement of damage elements, creation of a composite action by connecting the damage elements to a concrete slab, etc; but few of them are applicable to the Umberto 1 gallery. The one that seems to be applicable is the FRP (Fibre Reinforcement Polymer) technique. The behaviour of composite elements composed of FRP and steel members under tension seems to be known, but little information is available as far as the behaviour of such elements in compression. Following the "Iron meeting" held in Naples on June 8th, 2006, tests on stocky elements with and without FRP are planned to be performed in tension and in compression to identify the effect of FRP on such elements. In addition, tests on slender columns will be performed with and without FRP to investigate the influence of the latter on the buckling resistance. All the tests will be accompanied by coupon tests to identify the mechanical properties of the constitutive material of the tested specimens (Liège contribution to WP7). Based on the test campaign, analytical design rules founded on an elastic approach have been developed for the computation of the resistance of iron columns reinforced by FRP; these rules are detailed in the present section and reflect the contribution of the University of Liège to WP9. [less ▲]

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See detailTests on iron materials
Ly, Dong Phuong Lam ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Report (2008)

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See detailRobust structures by joint ductility
Kuhlmann, Ulrike; Rolle, Lars; Jaspart, Jean-Pierre ULg et al

Report (2008)

In view of recent disasters and their immense economical and human consequences more and more focus is given not only on the safety of structures - to reduce the risk for the life of people by collapse ... [more ▼]

In view of recent disasters and their immense economical and human consequences more and more focus is given not only on the safety of structures - to reduce the risk for the life of people by collapse even under exceptional loading – but on minimizing the disastrous results and to enable a quick rebuilding and reuse. One crucial mean to achieve this aim is the design of redundant robust structures. Robustness prevents the collapse of the total structure when only parts of the structure are damaged or destroyed. To avoid progressive failure, redundant structures with inherent sufficient ductile behaviour allowing deformations when a local failure occurs, have to be built. Redundancy can be achieved by allowing force redistribution within a structural system. Therefore the single sections and joints have to be especially designed and optimized, not necessarily requiring additional fabrication costs. But until now no specific rules for robustness by ductile joints exist. The aim of the present project is to define general requirements for ductile joints as part of a structural system subjected to exceptional unforeseen loading. [less ▲]

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See detailNumerical, analytical and experimental investigations on the response of steel and composite buildings further the loss of a column
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg; Luu, Nguyen Nam Hai ULg

in Proceedings of the Colloquium on structural design of constructions subjected to exceptional or accidental actions (2008)

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

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. Accord-ing to Eurocodes and some different other national design codes, the structural integrity of civil engineering constructions should be ensured through appropriate measures but, in most of the cases, no precise practical guidelines on how to achieve this goal are provided. A European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines ensuring the structural integrity of steel and composite structures under exceptional events through an appropriate robustness. In particular, one substructure test simulating the loss of a column in a composite building has been performed at Liège University. Present paper describes ana-lytical, numerical and experimental investigations carried out at Liège University as part of this European project. [less ▲]

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See detailAnalysis of Semi-Continuous Composite Beams with Partial Shear Connection Using 2-D Finite Element Approach
Titoum, M.; Tehami, M.; Achour, B. et al

in Asian Journal of Applied Sciences (2008), 1(3), 185-205

In this study, a two-dimensional finite element model using ANSYS software was proposed to study the behaviour of semi-continuous composite beams allowing for the concept of partial shear connection in ... [more ▼]

In this study, a two-dimensional finite element model using ANSYS software was proposed to study the behaviour of semi-continuous composite beams allowing for the concept of partial shear connection in both sagging and hogging moment regions. Some comparisons with experimental data available in the literature were reported to validate the efficiency of the proposed model. Using the verified model, a parametric study was carried out to investigate the effects of partial shear connection, along with the effects of reinforcing ratio and the presence of column web stiffeners, on the behaviour of semi-continuous composite beams. Based on the results obtained from the finite element analysis, the concept of partial shear connection in the hogging moment regions can be accepted provided that the shear connectors are sufficiently ductile, in spite of the requirement of full shear connection specified in Eurocode 4 for continuous and semi-continuous composite beams. [less ▲]

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See detailSteel column base classification
Jaspart, Jean-Pierre ULg; Wald, F.; Weynand, K. et al

in Heron (2008), 53(1/2),

The influence of the rotational characteristics of the column bases on the structural frame response is discussed and specific design criteria for stiffness classification into semi-rigid and rigid joints ... [more ▼]

The influence of the rotational characteristics of the column bases on the structural frame response is discussed and specific design criteria for stiffness classification into semi-rigid and rigid joints are derived. The particular case of an industrial portal frame is then considered. [less ▲]

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See detailBase plate in bending and anchor bolts in tension
Wald, F.; Sokil, Z.; Jaspart, Jean-Pierre ULg

in Heron (2008), 53(1/2),

This paper describes the behaviour of the base plate in bending and the anchor bolts in tension, which are the major components of a base plate connection. An analytical model has been derived to predict ... [more ▼]

This paper describes the behaviour of the base plate in bending and the anchor bolts in tension, which are the major components of a base plate connection. An analytical model has been derived to predict the component characteristics – the resistance and the stiffness. A description is given of how the behaviour is influenced by contact between the base plate and the concrete surface. The presented analytical model has been verified by tests and a finite element simulation. [less ▲]

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See detailComponent method for steel column base plates
Wald, F.; Sokol, Z.; Steenhuis, C. M. et al

in Heron (2008), 53(1/2),

This paper presents the application of the component method to steel column bases. The decomposition of the connection into components is described. An analytical model is presented to determine the ... [more ▼]

This paper presents the application of the component method to steel column bases. The decomposition of the connection into components is described. An analytical model is presented to determine the moment resistance and the rotational stiffness of column bases under axial forces. The analytical model is verified with test results. A sensitivity study of the base plate thickness and the anchor bolt length is presented. [less ▲]

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