References of "Jaspart, Jean-Pierre"
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See detailRobustness of steel structures subjected to a column loss scenario
Demonceau, Jean-François ULiege; D'Antimo, Marina ULiege; Jaspart, Jean-Pierre ULiege

in Caspeele, Robby; Taerwe, Luc; Frangopol, Dan (Eds.) Life-Cycle Analysis and Assessment in Civil Engineering: towards an integrated vision (2018, 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 modern design ... [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 modern design codes, the struc-tural integrity of civil engineering structures should be ensured through appropriate measures but, in most cas-es, no precise practical guidelines on how to achieve this goal are provided. The Eurocode dealing with this topic is Eurocode 1, Part 1-7. For the above mentioned reason, this Eurocode is presently under revision with the objective of providing improved general recommendations to ensure an appropriate structural robustness in case exceptional events. In this framework, the robustness of steel and composite steel-concrete building frames is investigated at the University of Liege for many years following the so-called “alternative load path method”. The present paper gives a global overview of the ongoing researches in the field of robustness at the University of Liège. [less ▲]

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See detailBehaviour of an innovative joint solution under impulsive loading
D'Antimo, Marina ULiege; Demonceau, Jean-François ULiege; Jaspart, Jean-Pierre ULiege

in Caspeele, Robby; Taerwe, Luc; Frangopol, Dan (Eds.) Life-Cycle Analysis and Assessment in Civil Engineering: towards an integrated vision (2018, September)

In the framework of the European project “FREEDAM”, an innovative joint solution, able to act as damper for seismic action, is proposed. The proposed joint can withstand high rotational demand associated ... [more ▼]

In the framework of the European project “FREEDAM”, an innovative joint solution, able to act as damper for seismic action, is proposed. The proposed joint can withstand high rotational demand associated to seismic events, without suffering of almost any damage. This is achieved by activating friction components at the joint level, which are acting as fuses, in case of seismic action, which are tailored to keep their mechanical properties constant. The University of Liège is in charge of investigating the structural robustness of buildings equipped with friction dampers and their response under impulsive loading. Consequently, double-sided beam-to-column connections were tested by means of a dropping mass. To track the deformation of some elements during the test, Digital Image Correlation (DIC) have been used. The outcome of the experimental campaign is the characterization of the joint behaviour under impulsive loading; some preliminary results of the experimental campaign are detailed hereinafter. [less ▲]

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See detailAnalysis of the behaviour of semi rigid steel end plate connections
Bahaz, A.; Amara, S.; Jaspart, Jean-Pierre ULiege et al

in 2nd international congress on materials and structural stability (CMSS-2017) (2018, February 14)

The analysis of steel-framed building structures with full strength beam to column joints is quite standard nowadays. Buildings utilizing such framing systems are widely used in design practice. However ... [more ▼]

The analysis of steel-framed building structures with full strength beam to column joints is quite standard nowadays. Buildings utilizing such framing systems are widely used in design practice. However, there is a growing recognition of significant benefits in designing joints as partial strength/semi-rigid. The design of joints within this partial strength/semi-rigid approach is becoming more and more popular. This requires the knowledge of the full nonlinear moment-rotation behaviour of the joint, which is also a design parameter. The rotational behaviour of steel semi rigid connections can be studied using the finite element method for the following three reasons: i) such models are inexpensive; ii) they allow the understanding of local effects, which are difficult to measure accurately physically, and iii) they can be used to generate extensive parametric studies. This paper presents a three-dimensional finite element model using ABAQUS software in order to identify the effect of different parameters on the behaviour of semi rigid steel beam to column end plate connections. Contact and sliding between different elements, bolt pretension and geometric and material non-linearity are included in this model. A parametric study is conducted using a model of two end-plate configurations: flush and extended end plates. The studied parameters were as follows: bolts type, end plate thickness and column web stiffener. Then, the model was calibrated and validated with experimental results taken from the literature and with the model proposed by Eurocode3. The procedure for determining the moment–rotation curve using finite element analysis is also given together with a brief explanation of how the design moment resistance and the initial rotational stiffness of the joint are obtained. [less ▲]

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See detailBearing strength of shear connections for tubular structures: An analytical approach
Latour, Massimo ULiege; Rizzano, Gianvittorio; D'Antimo, Marina ULiege et al

in Thin-Walled Structures (2018), 127

This work deals with the prediction of the bearing resistance of elementary shear connections constituted by gusset plates and square hollow sections fastened with long bolts. The research is motivated by ... [more ▼]

This work deals with the prediction of the bearing resistance of elementary shear connections constituted by gusset plates and square hollow sections fastened with long bolts. The research is motivated by the lack of specific rules in international codes for this particular configuration. In fact, while in lap shear connections, single or double-sided, the holes are always confined out of plane, in case of connections with long bolts and gusset plates (typical of tubular structures), the holes are constrained out of plane outwards, but they are free to buckle inwards, providing a reduction of the bearing strength. Within this framework, the paper is aimed at the development of an analytical formulation for the prediction of the bearing resistance of connections with long bolts and square hollow sections (SHS). The proposal is based on the calculation of the post-buckling load of the tube plate subjected to bearing at the bolt hole, combining the Winter's formula (originally developed to predict the post-buckling strength of steel plates accounting for geometrical and mechanical imperfections) with a simplified FE model developed in SAP 2000. The procedure developed is presented in detail proposing a design equation for connections with long bolts, based on a formula suggested recently by Može (2014, 2016) suitable for the inclusion in code provisions such as EC3. The accuracy of the design equation is checked on the experimental data reported in a previous work of the same authors properly extended with parametric FE simulations to cope for variation of geometrical parameters. [less ▲]

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See detailEQUALJOINTS PLUS - Documento pre-normativo e linee guida per il progetto sismico dei nodi trave-colonna prequalificati
Landolfo, Raffaele; D'Aniello, Mario; Tartaglia, Roberto et al

Book published by ECCS (2018)

Detailed reference viewed: 9 (1 ULiège)
See detailEQUALJOINTS PLUS - Volume informativo sui nodi pre-qualifcati per le applicazioni sismiche
Landolfo, Raffaele; D'Aniello, Mario; Costanzo, Silvia et al

Book published by ECCS (2018)

Detailed reference viewed: 9 (1 ULiège)
See detailEQUALJOINTS PLUS - Semmelband mit pränormativen bemessungsempfehlungen für seismisch qualifizierte stahlanschlüsse
Landolfo, Raffaele; D'Aniello, Mario; Tartaglia, Roberto et al

Book published by ECCS (2018)

Detailed reference viewed: 8 (0 ULiège)
See detailEQUALJOINTS PLUS - Sammelband mit informationsbroschüren für 4 seismisch qualifizierte anschlüsse
Landolfo, Raffaele; D'Aniello, Mario; Costanzo, Silvia et al

Book published by ECCS (2018)

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See detailPreliminary Study on Beam-To-Column Joints Under Impact Loading
D'Antimo, Marina ULiege; Latour, Massimo; Rizzano, Gianvittorio et al

in The Open Construction and BuildingTechnology Journal (2018), 12

Detailed reference viewed: 13 (4 ULiège)
See detailEQUALJOINTS PLUS - Volume with information borchures for 4 seimsically qualified joints
Landolfo, Raffaele; D'Aniello, Mario; Costanzo, Silvia et al

Book published by ECCS (2018)

Detailed reference viewed: 37 (0 ULiège)
See detailEQUALJOINTS PLUS - Volume with pre-normative design recommendations for seismically qualified steel joints
Landolfo, Raffaele; D'Aniello, Mario; Tartaglia, Roberto et al

Book published by ECCS (2018)

Detailed reference viewed: 21 (0 ULiège)
See detailEQUALJOINTS PLUS Recommandations pré-normatives pour le calcul parasismique d'assemblages pré-qualifiés en construction métallique
Landolfo, Raffaele; D'Aniello, Mario; Tartaglia, Roberto et al

Book published by ECCS (2018)

Detailed reference viewed: 21 (0 ULiège)
See detailEQUALJOINTS PLUS - Descritptif de 4 types d'assemblages préqualifiés pour la construction parasismique
Landolfo, Raffaele; D'Aniello, Mario; Costanzo, Silvia et al

Book published by ECCS (2018)

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See detailOn the robustness of earthquake-resistant moment-resistant frames: influence of innovative beam-to-column joints
Bianca Francavilla, Antonella; Latour, Massimo; Rizzano, Gianvittorio et al

in Open Construction and Building Technology Journal (2018), 12

Background: The deformation capacity of beam-to-column connections strongly influences the robustness of earthquake-resistant Moment Resistant Frames (MRFs) when subjected to a loss-of column scenario. As ... [more ▼]

Background: The deformation capacity of beam-to-column connections strongly influences the robustness of earthquake-resistant Moment Resistant Frames (MRFs) when subjected to a loss-of column scenario. As a consequence, with the aim of foresee the structural response up to the failure, an accurate modelling of the ultimate behaviour of the joints is needed. Objective: In this paper, the influence of the connections on the behaviour of MRFs under a loss-of-column scenario has been analysed considering an accurate modelling of the joints. Method: In addition, in order to achieve this goal, different beam-to-column joints designed for seismic actions and tested at the Salerno University, have been modelled and introduced in a case-study structure, whose response has been evaluated by means of push-down analyses. In particular, the connections analysed and modelled are of three different types: a dog-bone connection, a partial strength Double Split Tee (DST) joint and a partial strength connection with friction dampers. Results / Conclusion: The results of pushdown analyses performed by means of SAP2000 computer software have been examined with the aim to determine the Residual Reserve Strength Ratio (RRSR) index that, combined with the energy balance method proposed by Izzudin etal. (2008), allow to assess the structural ro-bustness [less ▲]

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See detailPreliminary Finite Element Analyses on Seismic Resistant FREE from DAMage Beam to Column Joints under Impact Loading
D'Antimo, Marina ULiege; Zimbru, Mariana; D'Aniello, Mario et al

in Key Engineering Materials (2018), 763

Detailed reference viewed: 44 (7 ULiège)
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See detailA component method for cold-formed steel beam-to-column bolted gusset plate joints
Bucmys, Zilvinas; Daniunas, Alfonsas; Jaspart, Jean-Pierre ULiege et al

in Thin-Walled Structures (2018), 123

Cold-formed steel elements are being used more frequently on construction sites because of the good strength-to-cost ratio. However, insufficient studies are published examining the properties of these ... [more ▼]

Cold-formed steel elements are being used more frequently on construction sites because of the good strength-to-cost ratio. However, insufficient studies are published examining the properties of these constructions. This paper presents a study of cold formed steel bolted gusset plate connections. A “three springs” mechanical model to calculate joint stiffness is presented. Then the results predicted through the proposed model are validated through comparisons to experimental and finite element results. [less ▲]

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See detailExperimental and theoretical analysis of shear bolted connections for tubular structures
D'Antimo, Marina ULiege; Demonceau, Jean-François ULiege; Jaspart, Jean-Pierre ULiege et al

in Journal of Constructional Steel Research (2017), 138

In this paper, numerical and experimental investigations devoted to the evaluation of the bearing resistance of tubular members with gusset plates and through-all long bolts are presented. Unlike lap ... [more ▼]

In this paper, numerical and experimental investigations devoted to the evaluation of the bearing resistance of tubular members with gusset plates and through-all long bolts are presented. Unlike lap shear joints, the analysed connection evidences a reduced confinement of the bearing area associated to the use of long bolts and the presence of a gap in the member, which can lead, consequently, to a reduction of the bearing resistance. In order to investigate the behaviour of shear connections made up of thin and thick SHS (Square Hollow Section) profiles and long bolts, an experimental test campaign including 24 specimens and FE simulations have been conducted. Both experimental and FE results have confirmed the influence of local instability on the hole in bearing resistance of thin profiles and the poor accuracy of the available standards for this particular joint typology. In particular, the performed comparisons have shown that, for thin profiles, EC3 model is likely to overestimate the resistance, while for higher thickness of the SHS conservative predictions are obtained. The present paper presents the conducted experimental and numerical investigations, highlighting at the end the need for a proper formulation able to account for the local instability effect on the bearing resistance. [less ▲]

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See detailPRELIMINARY STUDY ON BEAM-TO-COLUMN JOINTS UNDER IMPACT LOADING
D'Antimo, Marina ULiege; Latour, Massimo; Rizzano, Gianvittorio et al

in Proceedings CTA 2017 (2017, September)

Recent catastrophic events have pointed out the necessity of ensuring the integrity for structures under “exceptional” events. Since many years, the University of Liège is involved in different activities ... [more ▼]

Recent catastrophic events have pointed out the necessity of ensuring the integrity for structures under “exceptional” events. Since many years, the University of Liège is involved in different activities and projects mainly related to the robustness assessment of structures. The robustness of a structure is the capacity of the system to remain globally stable after events not directly ac- counted for in the design, like impact, fire or consequences of a human error, leading to a reason- able damage when compared to the original cause. Particular attention has been dedicated to the loss of column scenario with analytical and numerical investigations. As a contribution to differ- ent European projects (FREEDAM and ROBUSTIMPACT), experimental campaigns have been carried out or are currently undergoing, with the aim of understanding the behaviour of different joint typologies under impact loads. The experimental campaigns have the goal to underline the influence of the strain-rate of the joint components on the behaviour of the tested connections. In the present paper, an overview on the design criteria for the ongoing experimental campaign, on the preliminary results and findings is given and critically analysed. Particularly, an application in the field of the FREEDAM project is presented. [less ▲]

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See detailBeam-to-column joints, column bases and joint components under impact loading
Demonceau, Jean-François ULiege; Vanvinckenroye, Hélène ULiege; D'Antimo, Marina ULiege et al

in Proceeding of Eurosteel 2017 conference (2017, September)

Recent events such as natural catastrophes or terrorist attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the ... [more ▼]

Recent events such as natural catastrophes or terrorist attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the University of Liege is strongly involved in researches on the response of structures further to such exceptional events through participations to national or European research projects. In particular, the University of Liege has contributed very recently to a European research project entitled ROBUSTIMPACT investigating the behaviour of steel or steel-concrete composite building structures subjected to impact loading and proposing simplified procedures to predict the response of such structures under the considered scenario. As a contribution to this research project, an experimental test campaign was realised in Liège; the objective was to study the behaviour of beam-to-column joints, of column bases and of most of their constitutive components under impact loading and, in particular, to highlight the influence of the strain rate effects on the response of the studied joints and components. The proposed paper first describes the conducted test campaign with all the required details about the tested specimens and the testing setup; then the analysis of the so-obtained experimental results is presented. Finally authors’ views on how to account for the strain rate effects in analytical approaches for joint design is briefly expressed. [less ▲]

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See detailInfluence of beam-to-column joints on the robustness of earthquake-resistant moment-resistant frames
Francavilla, Antonella; Latour, Massimo; Rizzano, Gianvittorio et al

in Proceeding of Eurosteel 2017 conference (2017, September)

Robustness of Moment Resistant Frames (MRFs) designed according to current seismic codes and subjected to a loss-of-column scenario is strictly linked to the deformation capacity of beam-to-column ... [more ▼]

Robustness of Moment Resistant Frames (MRFs) designed according to current seismic codes and subjected to a loss-of-column scenario is strictly linked to the deformation capacity of beam-to-column connections, which are usually subjected to combined axial and bending loads. In the seismic design of steel frames, once avoided the yielding of columns, a global dissipative collapse mechanism has to be ensured by imposing the formation of plastic hinges at the ends of the beams or in the connections and guarantying, provided that the elements involved in plastic range have an adequate energy dissipation capacity. Within this framework, the aim of this paper is to analyse the influence of the response of the connections designed for seismic application on the global behaviour of MRFs under a loss-of-column scenario providing an accurate modelling of connections subjected to combined axial and bending loads. To this scope four different beam-to-column joints designed for seismic actions, previously tested under cyclic load history at the STRENGTH laboratory of Salerno University, have been modelled and introduced in a case-study structure, whose response has been assessed by means of push-down analyses. The performances of the analysed frames have been analysed and is compared using the Residual Reserve Strength Ratio (RRSR) index combined with the energy balance method. [less ▲]

Detailed reference viewed: 39 (6 ULiège)