References of "Jaspart, Jean-Pierre"
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See detailHigh strength steel in seismic resistant building frames - HSS-SERF - Final report
Dubina, Dan; Vulcu, Cristian; Stratan, Aurel et al

Report (in press)

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 ▲]

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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)

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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)

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailRobusimpact - Design report of the specimens for all the experimental analyses - Deliverable 4.1
Hoffman, Nadine; Kuhlmann, Ulrike; Huvelle, Clara ULg et al

Report (2014)

The present report focuses on the design of the experimental analysis that are going to be performed within the ROBUSTIMPACT project (Grant Agreement Number: RFSR-CT-2012-00029). The project focuses on ... [more ▼]

The present report focuses on the design of the experimental analysis that are going to be performed within the ROBUSTIMPACT project (Grant Agreement Number: RFSR-CT-2012-00029). The project focuses on the behavior of composite steel and concrete framed buildings against accidental actions. Within the project, several experimental analyses are going to be performed spanning from the local to the global behavior. [less ▲]

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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 ▲]

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See detailProposal of a simplified analytical approach for the characterisation of the end-plate component in circular tube connection
Hoang, Van Long ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Journal of Constructional Steel Research (2013), 90

This paper presents a study realised at Liège University on the behaviour of the rectangular end-plate in bending and the bolt in tension components met in circular tube-to- circular tube connections and ... [more ▼]

This paper presents a study realised at Liège University on the behaviour of the rectangular end-plate in bending and the bolt in tension components met in circular tube-to- circular tube connections and in circular tubular column bases. Analytical formulas for the mentioned components are firstly proposed considering different yield line patterns for the end-plate. Then the results predicted through the proposed analytical approach are validated through comparisons to experimental and finite element results. Finally, the application of the proposed approach for the prediction of the strength of tube-to-tube joints and also for the prediction of the bolt force of column bases is demonstrated. [less ▲]

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See detailINNOVATIVE BOLTED BEAM-TO-COLUMN JOINTS IN MOMENT RESISTANT BUILDING FRAME: FROM EXPERIMENTAL TESTS TO DESIGN GUIDELINES
Hoang, Van Long ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Dubina, Dan; Landolfo, Raffaele; Stratan, Aurel (Eds.) et al Application of High Strength Steels in Seismic Resistant Structures (2013)

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See detailA NEW SIMPLIFIED ANALYTICAL DESIGN METHOD FOR STEEL AND COMPOSITE SWAY FRAMES
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Journal of Constructional Steel Research (2013)

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 Liège 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 detailBehaviour of bolted flange joints in tubular structures under monotonic, repeated and fatigue loadings I: Experimental tests
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Journal of Constructional Steel Research (2013), 85

This paper presents a test program on bolted flange plate connections used in circular tubular structures. In the tested joints, the connected tubular elements are made of high strength steel (TS590 ... [more ▼]

This paper presents a test program on bolted flange plate connections used in circular tubular structures. In the tested joints, the connected tubular elements are made of high strength steel (TS590) whilst normal steel grade (S355) is used for the flanges. The tests were performed under monotonic loadings to obtain the mechanical properties of the connections and under cyclic loadings to characterise the behaviour of these connections for low cycle and high cycle fatigue. The test results are first presented herein, including a critical analysis of the latter; then, designmethods available in literature are applied for the tested configurations with the objective to investigate the accuracy of these methods through comparisons with the experimental results. [less ▲]

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See detailRobustness of steel building structures following a column loss
Huvelle, Clara ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in IABSE Workshop Helsinki 2013 "Safety, Failures and Robustness of Large Structures" Report (2013, February)

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See detailComposite joints under M-N at elevated temperatures - Experimental investigations and analytical model
Demonceau, Jean-François ULg; Haremza, Cécile; Jaspart, Jean-Pierre ULg et al

in Proceeding of the Composite Construction VII conference (2013)

The Eurocodes recognise robustness as a way to ensure the structural integrity of a building frame subjected to an unforeseen event and therefore to avoid a so-called “progressive failure” mode in extreme ... [more ▼]

The Eurocodes recognise robustness as a way to ensure the structural integrity of a building frame subjected to an unforeseen event and therefore to avoid a so-called “progressive failure” mode in extreme loading situations. However few practical guidelines exist nowadays which would allow a designer to design a structure accordingly. Within the European RFCS ROBUSTFIRE project, the behaviour of steel and composite car parks subjected to localised fire leading to a column loss was investigated. Under such a scenario, the beam-to-column joints play a key role in the global structural response. Indeed, these joints, initially loaded in bending, may be subjected to elevated temperatures and to combined axial load “N” and bending moment “M”. In this paper, a methodology to predict the mechanical response of bolted composite beam-to-column joints at elevated temperatures under M-N is presented and validated through comparison to experimental tests conducted at the University of Coimbra. [less ▲]

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See detailA "new" design requirement: the mitigation of the progressive collapse of buildings under exceptional loading
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Proceedings of the First International Conference of Civil Engineering (2012, November)

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 that, 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; in particular, the global strategy to derive design requirements is detailed. [less ▲]

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See detailGap analysis on robustness of tubular structures
Jaspart, Jean-Pierre ULg; Huvelle, Clara ULg; Demonceau, Jean-François ULg

Report (2012)

Recent events such as natural catastrophes (tsunami, hurricane, …) or terrorism attacks have highlighted the necessity of ensuring the structural integrity of buildings under exceptional events with the ... [more ▼]

Recent events such as natural catastrophes (tsunami, hurricane, …) or terrorism attacks have highlighted the necessity of ensuring the structural integrity of buildings under exceptional events with the objective to save the life of the occupants and of the safety services (fireman, ambulance man, …) and also to avoid collateral damages to the adjoining buildings. The partial collapse of the Ronan Point Tower in 1968 in UK is considered as the starting point of the interest in the structural integrity of buildings but more recent catastrophes in the last decade such as the terrorist attack of the World Trade Center towers in 2001 or the earthquake/tsunami in Fukushima in 2011 have increased the interest of the engineering community and also of the population in this topic. According to different national and international 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. In the present report, some definitions are first given. Existing codes and standards are then reviewed and main conclusions are drawn on their adequacy to the present needs of practitioners. From this analysis, general and specific research needs within CIDECT are identified. These ones are detailed in two dedicated sections respectively on buildings and trusses. A summary table draws the main conclusions in terms of future required CIDECT investments. Finally some references to literature are listed. [less ▲]

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