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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 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 detail“State-of-problem report prepared for the TC11 meeting held in Valencia on October 2012”
Demonceau, Jean-François ULg; Hjiaj, Mohammed; Aribert, Jean-Marie et al

Report (2012)

The present document summarises recent studies and developments investigating the behaviour of composite frames, for discussion within TC11 Committee. Also, possible aspects to be investigated in future ... [more ▼]

The present document summarises recent studies and developments investigating the behaviour of composite frames, for discussion within TC11 Committee. Also, possible aspects to be investigated in future are identified. The document is organised as follows: • First, the global frame behaviour is considered in § 2; • Then, the structural members which can be met in a composite structure, i.e. the composite slabs, the composite beams, the composite columns and the composite joints, are considered in separate paragraph from § 3 to § 6; • A specific paragraph is also dedicated to the possible long term effects on composite members (§ 7); • Finally, a conclusion is drawn in § 8, summarising recent improvements in the knowledge about composite frame design and possible further developments. A first draft of this document was presented at the TC11 meeting held in Liège on March 2010. The present document is an updated draft to be discussed at the TC11 meeting held in Valencia on october 2012. Remark: the aspects related to the response of composite structures subjected to seismic or fire actions are not reported here as they are covered by other more “transversal” technical committees of ECCS (TC3 for the fire and TC13 for the seismic action). [less ▲]

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See detailAnforderungen an Stahl- und Verbundknoten bei Stützenausfall in einem Rahmentragwerk
Kuhlmann, Ulrike; Rölle, Lars; Jaspart, Jean-Pierre ULg et al

in Stahlbau (2010), 8(August 2010), 565-579

Local failure in a structure (e.g. sudden column loss due to impact or explosion) could lead to progressive collapse propagation of the global structural system resulting in a total collapse. To avoid ... [more ▼]

Local failure in a structure (e.g. sudden column loss due to impact or explosion) could lead to progressive collapse propagation of the global structural system resulting in a total collapse. To avoid progressive collapse initiated by local damage a redistribution of force from the damaged part of the structure has to be enabled by alternate load path. Activation of alternate load paths by change of the bearing mechanism from pure bending state to more or less pure membrane state is a measure but only possible by allowing large global deformations resulting in high de-formation requirements for the joints. In the frame of a European RFCS research project ductile joint solution have been developed to improve the robustness as characteristic of the structure. Main focus for the joint design was given to obtain the required deformation capacity for acci-dental design situations mainly from the joints and cause at the same time only less additional material and fabrication costs for the joints. As a result deformable and partial-strength joint solution has been chosen. Objective within the project was to determine requirements of the joints concerning deformation capacity as well as M-N-resistance to enable the activation of catenary action for the load case notional column removal. [less ▲]

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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 detailInteraction of global and local buckling in welded RHS compression members
Degée, Hervé ULg; Detzel, Annette; Kuhlmann, Ulrike

in Journal Of Constructional Steel Research (2008), 64(7-8), 755-765

This paper presents the results of a research project analysing some aspects of the stability failure of thin-walled compression members that are likely to exhibit combined global and local buckling. In ... [more ▼]

This paper presents the results of a research project analysing some aspects of the stability failure of thin-walled compression members that are likely to exhibit combined global and local buckling. In particular, the influence of various imperfections, namely residual stresses due to welding and local as well as global geometrical defects, on the load-carrying capacity was Subjected to detailed experimental and numerical investigations. The insights obtained into the structural behaviour led to a proposal for modification of the non-dimensional slenderness used in the global buckling verification, and to the recommendation of a shift from the Currently applied European buckling curve to a more favourable one in the case of non-stiffened members with welded box sections subjected to pure compression. (C) 2008 Elsevier Ltd. All rights reserved. [less ▲]

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See detailRobustness - Robust structures by joint ductility
Kuhlmann, Ulrike; Rölle, Lars; Jaspart, Jean-Pierre ULg et al

in Wald, F.; Mazzolani, F.; Byfield, M. (Eds.) et al Urban Habitat Constructions under Catastrophic Events (2007, March 30)

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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