References of "Demonceau, Jean-François"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailPressure-impulse diagram of a beam developing non-linear membrane action under blast loading
Hamra, Lotfi ULg; Demonceau, Jean-François ULg; Denoël, Vincent ULg

in International Journal of Impact Engineering (2015), 86

The p–I diagram of a frame beam subjected to blast loading is established, including the elastic lateral restraint and inertia offered by the rest of the structure, the development of nonlinear membrane ... [more ▼]

The p–I diagram of a frame beam subjected to blast loading is established, including the elastic lateral restraint and inertia offered by the rest of the structure, the development of nonlinear membrane action and also, the bending-tension (M−N) interaction that develops in the plastic hinges. The analytical procedures to compute the asymptotes in the p–I diagram as well as a parametric study on the p–I diagram are provided. A dimensional analysis of the problem reveals that, under the considered assumptions, four dimensionless parameters mainly influence the required ductility of the beam. Two of them are related to the behavior of the indirectly affected part (the lateral restraint and mass). Another one is related to the mechanical properties of the investigated beam (i.e. the ratio of the bending to axial resistance). The last parameter incorporates scales of the geometry and of the deformed configuration at the onset of the plastic mechanism. [less ▲]

Detailed reference viewed: 68 (18 ULg)
Full Text
Peer Reviewed
See detailAnalytical model for composite joints under sagging moment
Bennacer, M.A.; Berouai, A; Kriker, A et al

in Engineering Structures (2015), 101

Nowadays, modern codes and standards such as the (Eurocode 4, 2004) deal with the characterisation of steel–concrete composite joints in building structures, mainly under hogging bending moments in the ... [more ▼]

Nowadays, modern codes and standards such as the (Eurocode 4, 2004) deal with the characterisation of steel–concrete composite joints in building structures, mainly under hogging bending moments in the beam. However, in sway composite frames or when the composite structure is subjected to an accidental/exceptional event such as earthquake or column loss, the beam-to-column joint may be subjected to sagging bending moment, a loading situation which is not yet covered by the codes. This paper deals with the behaviour of composite beam-to-column external joints under sagging bending moments, mainly focusing on the specific joint component “concrete slab in compression”. Indeed, if reference is made to Eurocodes, the method recommended to characterise structural joints is the component method and the “concrete slab in compression” component has been identified as the missing component to be able to apply this method to composite joints subjected to sagging bending moment. In this article, the finite element method is used to model the slab using VecTor 2 software. Through the performed numerical simulations, the behaviour of the slab is studied in detail and an analytical model is proposed. With the proposed model, it is possible to characterise the concrete slab in compression component and so, to apply the component method to predict the mechanical properties of composite joints subjected to sagging bending moment. [less ▲]

Detailed reference viewed: 15 (0 ULg)
Full Text
See detailRobustimpact project - System design
Demonceau, Jean-François ULg

Conference (2015, June 16)

Detailed reference viewed: 17 (1 ULg)
Full Text
See detailConcept of robustness
Demonceau, Jean-François ULg

Conference (2015, June 16)

Detailed reference viewed: 24 (2 ULg)
Full Text
Peer Reviewed
See detailExtended end-plate to concrete- filled rectangular column joint using long bolts
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Journal of Constructional Steel Research (2015), 113

Detailed reference viewed: 19 (6 ULg)
Full Text
Peer Reviewed
See detailBeam to concrete-filled rectangular hollow section column joints using long bolts
Hoang, Van Long ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Proceedings of the 15th international symposium on tubular structures - ISTS15 (2015, May)

This paper presents a research on a specific type of unstiffened extended end-plate joint used to connect I-shaped beams to concrete-filled rectangular hollow section columns. The main idea is to use long ... [more ▼]

This paper presents a research on a specific type of unstiffened extended end-plate joint used to connect I-shaped beams to concrete-filled rectangular hollow section columns. The main idea is to use long bolts throughout the column to connect the beam end-plates, so avoiding intermediate connecting elements (e.g. a reverse U channel) or special bolts (e.g. blind bolts). However, the use of long bolts for beam-to-column connections is still rare in the construction and no design procedure exists in the Eurocodes; this justifies the pre-sent research. Firstly, a test program within a RFCS European project titled HSS-SERF “High Strength Steel in Seismic Resistant Building Frames”, 2009-2013 was performed. In this project, specimens subjected to sig-nificant bending moments (and shear) or to shear only was defined. Then, analytical developments based on the component approach and aimed at predicting the joint response have been carried out; their validity is demonstrated through comparisons with the tests. Finally, design guidelines have been provided. [less ▲]

Detailed reference viewed: 57 (10 ULg)
Full Text
Peer Reviewed
See detailAnalytical procedure to derive P-I diagram of a beam under explosion
Hamra, Lotfi ULg; Demonceau, Jean-François ULg; Denoël, Vincent ULg

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

The aim of this paper is to study a beam extracted from a frame and subjected to blast loading. The demand of ductility depends on six dimensionless parameters: two related to the blast loading, two ... [more ▼]

The aim of this paper is to study a beam extracted from a frame and subjected to blast loading. The demand of ductility depends on six dimensionless parameters: two related to the blast loading, two referring to the bending behaviour of the beam and two corresponding to the dynamic behaviour of the rest of the structure. We develop a full analytical procedure that provides the ductility demand as a function of these six dimensionless parameters. [less ▲]

Detailed reference viewed: 45 (17 ULg)
Full Text
Peer Reviewed
See detailRobust impact design of steel and composite building structures
Hoffman, Nadine; Kuhlmann, Ulrike; Demonceau, Jean-François ULg et al

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

Detailed reference viewed: 49 (8 ULg)
Full Text
Peer Reviewed
See detailRobust impact design of steel and composite building structures: the alternate load path approach
Hoffmann, Nadine; Kuhlmann, Ulrike; Demonceau, Jean-François ULg et al

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

Vulnerability of structures to progressive collapse and mitigation of the effects of local damages are topics widely discussed. The studies worldwide carried out allowed identifying different design ... [more ▼]

Vulnerability of structures to progressive collapse and mitigation of the effects of local damages are topics widely discussed. The studies worldwide carried out allowed identifying different design strategies. However, specific knowledge is still limited and this gap is apparent in codes of practice. A European project focusing on robustness of steel and steel and concrete composite structures regarding the effects of impact recently started combining the 2 methods of residual strength and alternate load path. In the framework of the project activities, the Authors aimed their studies on the redundancy of the structure through slab-beam-systems and ductile joint as well as on the local behaviour of the impacted members. For this analytical, numerical and experimental investigations have been planned and executed. The paper describes the experimental activities related to the investigations on the structural redundancy and presents the preliminary test outcomes. [less ▲]

Detailed reference viewed: 45 (6 ULg)
Full Text
See detailHigh strength steel in seismic resistant building frames (HSS-SERF)
Dubina, Dan; Vulcu, Cristian; Stratan, Aurel et al

Book published by Commission Européenne (2015)

The aim of “HSS-SERF” project was to investigate and evaluate the seismic performance of dual-steel building frames, realized from two different steel grades: Mild Carbon Steel (MCS) and High Strength ... [more ▼]

The aim of “HSS-SERF” project was to investigate and evaluate the seismic performance of dual-steel building frames, realized from two different steel grades: Mild Carbon Steel (MCS) and High Strength Steel (HSS). A comprehensive set of dual-steel frames (moment resisting, concentrically and eccentrically braced) were designed, which allowed the identification of realistic member sizes for both MCS and HSS components. Several practical solutions for bolted and welded beam-to-column joints were identified and designed. Further, an extensive numerical program was carried out for the seismic performance evaluation of frames. The ductility and over-strength demands, and q-factors associated with different performance levels were evaluated. Furthermore, experimental and numerical investigations were carried out on joint assemblies and components. Guidelines were elaborated for the conceptual design and PBD of dual-steel frames under seismic actions, and the technical and economic efficiency of dualsteel structures vs. conventional ones were finally evaluated. The main outcomes of the project consist in: (i) development and characterisation in terms of global ductility and over-strength demands of dual-steel frames with composite columns (innovative solutions in European context); (ii) development of design recommendations; (iii) proposal of innovative solutions for beam-to-column joints with composite columns; (iv) recommendation for weld details and appropriate component method design approaches; (v) evaluation of technical and economic efficiency of the dual-steel approach. [less ▲]

Detailed reference viewed: 140 (17 ULg)
Full Text
Peer Reviewed
See detailComplete analytical procedure to assess the response of a frame submitted to a column loss
Huvelle, Clara; Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg et al

in Engineering Structures (2015), 86

The present paper gives a global overview on recent developments performed at the University of Liege on structural robustness of buildings for the specific scenario ‘‘loss of a column’’. In particular, a ... [more ▼]

The present paper gives a global overview on recent developments performed at the University of Liege on structural robustness of buildings for the specific scenario ‘‘loss of a column’’. In particular, a complete analytical method to assess the response of a 2D frame losing statically one of its columns is presented in details. This method is based on the development of alternative load paths in the damaged structure and takes into account the couplings between the different parts of the structure which are differently affected by the column loss. Also, the validation of the developed method through comparison to experimental and numerical evidences is presented. [less ▲]

Detailed reference viewed: 64 (24 ULg)
Full Text
Peer Reviewed
See detailPressure-impulse diagram of a beam under explosion - Influence of the indirectly affected part
Hamra, Lotfi ULg; Demonceau, Jean-François ULg; Denoël, Vincent ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September 10)

The paper studies the structural response of a beam subjected to a close-field local internal blast loading. In the literature, the pressure-impulse (p-I) diagram is commonly used to design elements or ... [more ▼]

The paper studies the structural response of a beam subjected to a close-field local internal blast loading. In the literature, the pressure-impulse (p-I) diagram is commonly used to design elements or structures for a given blast loading. The p-I diagram is a spectrum representing the level sets of damage or required ductility for a given structural system, nonlinear beam in this paper. This representation is much appreciated because a simple reading for the actual pressure p and impulse I of the considered load indicates the ductility demand of the structural system. Recent works of quasi-static behaviour have indicated the crucial need to account for the membrane effects taking place in the extreme loading of frame beams. This paper will thus extend the state-of-art features, establishing thus the p-I diagram for a beam including the lateral restraints offered by the rest of the structure, the development of non-linear membrane action and also, the M-N interaction that develops in the plastic hinges. [less ▲]

Detailed reference viewed: 129 (25 ULg)
Full Text
Peer Reviewed
See detailHammer head beam solution for beam-to-column joints in seismic resistant building frames
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Journal of Constructional Steel Research (2014)

This paper presents a research on an innovative stiffened extended end-plate joint, used to connect I-shaped beams to partially-encased composite wide flange columns. In the joint, T-shaped hammer heads ... [more ▼]

This paper presents a research on an innovative stiffened extended end-plate joint, used to connect I-shaped beams to partially-encased composite wide flange columns. In the joint, T-shaped hammer heads cut from the same I-profiles than the beams are used, instead of using traditional haunches. At the joint level, the column web is strengthened by two lateral plates welded to the column flanges; these plates also reinforce the column flanges. This type of joint is proposed to use in the seismic resistance building frames, as a full-strength and a fully-rigid joint solution. Firstly, a test program carried out within a RFCS European project titled HSS-SERF “High Strength Steel in Seismic Resistant Building Frames”, 2009–2013, will be presented. Then, analytical developments based on the component approach and aimed at predicting the joint response will be described; their validity will be demonstrated through comparisons with the tests. Moreover, a new design concept for full strength joint accounting for the actual position of the plastic hinge and the possible individual overstrength factors for each component is proposed, respecting the requirements of EN1998-1-1. [less ▲]

Detailed reference viewed: 44 (12 ULg)
Full Text
Peer Reviewed
See detailBOLTED END-PLATE BEAM-TO-COLUMN JOINTS USING HAMMERHEAD BEAMS: Experimental tests and proposal of design guidelines
Demonceau, Jean-François ULg; Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September)

Detailed reference viewed: 53 (6 ULg)
Full Text
Peer Reviewed
See detailCIRCULAR TUBE COLUMNS IN HIGH STRENGTH STEEL: Economical solutions for building frames
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Landolfo, Raffaele; Mazzolani, Frederico (Eds.) Proceeding of the 7th European conference on steel and composite structures (Eurosteel 2014) (2014, September)

Detailed reference viewed: 60 (14 ULg)
Full Text
Peer Reviewed
See detailHow to check analytically the robustness of a building submitted to a column loss - A premiere
Huvelle, Clara ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Proceedings of Eurosteel 2014 conference (2014, 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 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 an exceptional event. According to Eurocodes and some other national design codes, the structural integrity of civil engineering structures should be guaranteed through appropriate measures and one way to guarantee it is to ensure an appropriate robustness of the structure, which may be defined as the ability of a structure to remain globally stable in case of exceptional event leading to local damages. However, although global design approaches are provided in modern codes and standards, no easy-to-apply practical guidelines are provided. The present paper reflects recent researches realised at the University of Liege with the scope of proposing such practical guidelines for the activation of alternative load path in the structure, design strategy generally leading to the most economical solutions. [less ▲]

Detailed reference viewed: 58 (16 ULg)
Full Text
Peer Reviewed
See detailResistance of through-plate component in beam-to-column joints with circular hollow columns
Hoang, Van Long ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Journal of Constructional Steel Research (2014), 92

A configuration of beam-to-column joint with circular hollow section columns is proposed. A vertical plate, called through-plate, passing through the column is used to support the beams. In order to ... [more ▼]

A configuration of beam-to-column joint with circular hollow section columns is proposed. A vertical plate, called through-plate, passing through the column is used to support the beams. In order to facilitate connecting the beams, two horizontal plates, each side of the column, are welded to the upper side of the through-plate. The lower flanges of the steel beams are connected to the horizontal plates by bolts, and the upper flanges are attached to the concrete slab by shear connections. The joint is considered as hinges in the construction phase while semi-rigid and partial strength can be adopted for the joint behaviour during the exploitation time. A development on the through-plate component of the joint is presented in this paper. Global behaviour of the joint under hogging moment and shear force is analysed leading to a mechanical model of the through-plate component. Using the elastic buckling theory of plates, the analytical formulas for critical stresses of the through-plate are obtained. The coefficients taking into account boundary conditions, material plasticity and geometrical imperfection are determined by finite element analysis. The proposed model is validated by experimental results showing a good accuracy. The design guideline for the component is finally provided for the practical purpose. [less ▲]

Detailed reference viewed: 108 (5 ULg)
Full Text
See detailRobustimpact - Drawings for producing the test specimens - Deliverable 4.2
Hoffman, Nadine; Kuhlmann, Ulrike; Huvelle, Clara ULg et al

Report (2014)

Within the RFCS project RobustImpact an experimental campaign, aimed at investigating the behaviour of framed steel and concrete composite structures under accidental loading conditions, was planned. The ... [more ▼]

Within the RFCS project RobustImpact an experimental campaign, aimed at investigating the behaviour of framed steel and concrete composite structures under accidental loading conditions, was planned. The residual strength of the damaged member after an impact as well as the dynamic interaction of the member with the surrounding structure will be experimentally investigated. The activation of alternate load paths will be also studied through tests on 3D slab and 2Dbeam systems. Additional tests on composite joints, beam-to-column joints, column bases and T-stub tests under high speed loading and impact loading will contribute at investigating the influences of strain rate effect on the deformation capacity of the connections.This document collects the drawings prepared by the above mentioned partners for producing the test specimens. [less ▲]

Detailed reference viewed: 45 (3 ULg)