References of "Zaharia, Raul"
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See detailNumerical analysis of partially fire protected composite slabs
Zaharia, Raul; Vulcu, Christian; Vassart, Olivier et al

in Steel and Composite Structures (2013), 14(1), 21-39

The paper presents a numerical investigation, done with the computer program SAFIR, in order to obtain simpler finite element models for representing the behaviour of the partially protected composite ... [more ▼]

The paper presents a numerical investigation, done with the computer program SAFIR, in order to obtain simpler finite element models for representing the behaviour of the partially protected composite steel concrete slabs in fire situation, considering the membrane action. Appropriate understanding and modelling of the particular behaviour of composite slabs allows a safe approach, but also substantial savings on the thermal insulation that has to be applied on the underlying steel structure. The influence of some critical parameters on the behaviour and fire resistance of composite slabs such as the amount of reinforcing steel, the thickness of the slab and the edge conditions is also highlighted. The numerical models are calibrated using the results of three full scale fire tests on composite slabs that have been performed in recent years. [less ▲]

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See detailValidation of the Advanced Calculation Model SAFIR Through DIN EN 1991-1-2 Procedure
Zaharia, Raul; Gernay, Thomas ULg

in Proceedings of the 10th International Conference ASCCS 2012 (2012, July 03)

The validation of advanced calculation models for the fire design is an important issue for computer code developers, designers and authorities. One approach consists in the comparison with experimental ... [more ▼]

The validation of advanced calculation models for the fire design is an important issue for computer code developers, designers and authorities. One approach consists in the comparison with experimental results, which are not always available or are not always useful, due to the lack of details about the input data or the results, or uncertainties about the boundary conditions. This paper presents the validation of the special purpose computer program SAFIR (2005) for structural fire analysis, through DIN EN1991-1-2 procedure (2010), which represents an alternative to the validation through fire tests. [less ▲]

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See detailAnalytical calculation of the bending capacity of slim floor beams under ISO fire
Zaharia, Raul; Franssen, Jean-Marc ULg

in Steel and Composite Structures (2012)

The calculation of fire resistance for a composite structural element comprises the calculation of the temperature within its cross-section and of the load bearing capacity, considering the evolution of ... [more ▼]

The calculation of fire resistance for a composite structural element comprises the calculation of the temperature within its cross-section and of the load bearing capacity, considering the evolution of the steel and concrete mechanical properties, function of the temperature. The paper proposes a method to calculate the bending capacity under ISO fire, for Slim Floor systems using asymmetric steel beams, with a wider lower flange or a narrow upper flange welded onto a half hot-rolled profile. The temperatures in the cross-section are evaluated by means of empirical formulas determined through a parametrical analysis, performed with the special purpose non-linear finite element program SAFIR. Considering these formulas, the bending capacity may be calculated, using an analytical approach to determine the plastic bending moment, for different fire resistance demands. The results obtained with this simplified method are validated through numerical analysis. [less ▲]

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See detailSimplified Fire Design for Slim Floor Beams
Zaharia, Raul; Duma, Diana Maria ULg; Vassart, Olivier et al

in Dunai, Laszlo (Ed.) Proceedings of the 6th European Conference on Steel and Composite Structures (2011, September 02)

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See detailSimplified method for the temperature distribution in slim floor beams
Zaharia, Raul; Duma, Diana Maria ULg; Vassart, Olivier et al

in Wald, F.; Horova, K.; Jirku, J. (Eds.) Proceedings of International Conference Applications of Structural Fire Engineering (2011, April 29)

From extensive numerical thermal simulations made with SAFIR, simple design equations have been derived that allow calculating the temperature in slim floor sections subjected to an ISO 834 fire.

Detailed reference viewed: 643 (12 ULg)
See detailEvaluarea rezistentei la foc a planseelor compuse protejate partial
Zaharia, Raul; Dubina, Dan; Pintea, Dan et al

Book published by Orizonturi Universitare (2011)

Detailed reference viewed: 35 (6 ULg)
See detailValidarea unui model de calcul avansat pentru analiza structurilor solicitate la actiunea focului
Zaharia, Raul; Dubina, Dan; Duma, Diana Maria ULg

Scientific conference (2010, November 26)

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See detailNumerical modelling of membrane action of composite slabs in fire situation
Vulcu, Cristian; Gernay, Thomas ULg; Zaharia, Raul et al

in Kodur, Venkatesh; Franssen, Jean-Marc (Eds.) Proceedings of the Sixth International Conference Structures in Fire (2010, June)

Membrane action in fire is now an intensively researched area, for which more improvement is always necessary. The paper presents some numerical simulations, done with the SAFIR program, in order to ... [more ▼]

Membrane action in fire is now an intensively researched area, for which more improvement is always necessary. The paper presents some numerical simulations, done with the SAFIR program, in order to derive more simple models for representing the partially protected composite floors in fire situation. The numerical models are calibrated using the results of three full scale tests that have been performed in recent years. [less ▲]

Detailed reference viewed: 148 (23 ULg)
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See detailDesigning Steel Structures for Fire Safety
Franssen, Jean-Marc ULg; Kodur, Venkatesh; Zaharia, Raul

Book published by Taylor & Françis Ed. (2009)

In this book the information relevant to fire design of steel structures is presented in a systematic way in seven chapters. Each Chapter begins with an introduction of various concepts to be covered and ... [more ▼]

In this book the information relevant to fire design of steel structures is presented in a systematic way in seven chapters. Each Chapter begins with an introduction of various concepts to be covered and follows with detailed explanation of the concepts. The calculation methods as relevant to code provisions (in Europe, North America or other continents) are discussed in detail. Worked examples relevant to calculation methodologies on simple structural elements are presented. For the case of complete structures guidance on how analysis can be carried out is presented. Chapter 1 of the book is devoted to providing relevant background information to codes and standards and principles of fire resistance design. The chapter discusses the fire safety design philosophies, prescriptive and performance-based design fire safety design issues. Chapter 2 deals with basis of design and mechanical loads. The load combinations to be considered for fire design of structures, as per European and North American codes and standards, are discussed. Chapter 3 discusses the detailed steps involved in establishing the fire scenarios for various cases. Both Eurocode and North American temperature-time relationships are discussed. Procedures in this section allow the designer to establish the time-temperature relationships or heat flux evolutions under a specified design fire. Chapter 4 deals with steps associated in establishing the temperature history in the steel structure, resulting from fire temperature. The various approaches for undertaking thermal analysis by simple calculation models are discussed. Chapter 5 presents the steps associated for establishing the mechanical response of a structure exposed to fire. The possibilities for analysis at different levels: member level, sub-structure level and global level are discussed. Full details related to simple calculation methods for undertaking strength analysis at member level are presented. Chapter 6 is devoted to fire resistance issues associated with design of joints. The steps associated with the fire resistance of a bolted or a welded joint through simplified and detailed procedure are discussed. Chapter 7 deals with thermal and mechanical analysis through advanced calculation models. The procedures involved in the sub-structure analysis or global structural analysis under fire exposure is fully discussed. Case studies are presented to illustrate the detailed fire resistance analysis of various structures. Chapter 8 presents four design examples showing how a complex structure can be designed using the concept of element or sub-structure analysis. The book concludes with two Annexes which present some of the design information related to material properties and temperature profiles. Annex 1 focuses on thermal properties of structural steel and commonly used insulation materials and resulting temperature profiles in steel. Annex 2 focuses on mechanical properties of structural steel. [less ▲]

Detailed reference viewed: 180 (5 ULg)
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See detailCalculul Constructiilor Metalice la Actiunea Focului
Franssen, Jean-Marc ULg; Zaharia, Raul

Book published by Editura Orizonturi Universitare (2008)

Detailed reference viewed: 122 (2 ULg)
See detailDesign of Steel Structures subjected to Fire. Background and Design Guide to Eurocode 3. 2nd édition
Franssen, Jean-Marc ULg; Zaharia, Raul

Book published by Les édtions de l'Université de Liège (2006)

The information that is necessary to perform the fire design of a structure made of a particular material, say a steel structure, is: a) The bases of design, stated in EN 1990. b) The mechanical actions ... [more ▼]

The information that is necessary to perform the fire design of a structure made of a particular material, say a steel structure, is: a) The bases of design, stated in EN 1990. b) The mechanical actions, i.e. the forces, acting on the structure in the fire situation. Some information is found in EN 1991-1-2, but explicit reference is also made to EN 1991-1-1 that is therefore also necessary. c) The thermal actions, i.e. the fire and the heat flux induced in the elements by the fire. The information is in EN 1991-1-2. d) The rules for determining the temperatures in the structure during the course of the fire. They are given in the fire part of the relevant material eurocode, e.g. EN 1993-1-2 for a steel structure. e) The rules for determining the structural stability. They are given in the fire part of the relevant material Eurocode, e.g. EN 1993-1-2 for a steel structure, but reference is often made to the cold part of the same material Eurocode, EN 1993-1-1 for a steel structure. This layout is valid in general but some exceptions do exist: the structural stability of timber elements, for example, does not necessarily require the determination of the temperatures in the element and step d) may be omitted; the same holds if the fire resistance is determined from tabulated data, for concrete elements for example. The rest of this book is organised according to this layout, see Fig. 1-2: Chapter 2 deals with bases of design and mechanical loads. Chapter 3 deals with thermal attack from the fire. Chapter 4 deals with thermal analysis by simple calculation model. Chapter 5 deals with mechanical analysis by simple calculation model. Chapter 6 deals with the design of joints. Chapter 7 deals with thermal and mechanical analysis by the advanced calculation model. Chapter 8 gives four design examples showing how a complete and sometimes complex structure can be designed using the concept of element or substructure analysis. [less ▲]

Detailed reference viewed: 203 (1 ULg)
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See detailDesign of Steel Structures subjected to Fire. Background and Design Guide to Eurocode 3.
Franssen, Jean-Marc ULg; Zaharia, Raul

Book published by Les Éditions de l'Université de Liège (2005)

The information that is necessary to perform the fire design of a structure made of a particular material, say a steel structure, is: a) The bases of design, stated in EN 1990. b) The mechanical actions ... [more ▼]

The information that is necessary to perform the fire design of a structure made of a particular material, say a steel structure, is: a) The bases of design, stated in EN 1990. b) The mechanical actions, i.e. the forces, acting on the structure in the fire situation. Some information is found in EN 1991-1-2, but explicit reference is also made to EN 1991-1-1 that is therefore also necessary. c) The thermal actions, i.e. the fire and the heat flux induced in the elements by the fire. The information is in EN 1991-1-2. d) The rules for determining the temperatures in the structure during the course of the fire. They are given in the fire part of the relevant material eurocode, e.g. EN 1993-1-2 for a steel structure. e) The rules for determining the structural stability. They are given in the fire part of the relevant material Eurocode, e.g. EN 1993-1-2 for a steel structure, but reference is often made to the cold part of the same material Eurocode, EN 1993-1-1 for a steel structure. This layout is valid in general but some exceptions do exist: the structural stability of timber elements, for example, does not necessarily require the determination of the temperatures in the element and step d) may be omitted; the same holds if the fire resistance is determined from tabulated data, for concrete elements for example. The rest of this book is organised according to this layout, see Fig. 1-2: Chapter 2 deals with bases of design and mechanical loads. Chapter 3 deals with thermal attack from the fire. Chapter 4 deals with thermal analysis by simple calculation model. Chapter 5 deals with mechanical analysis by simple calculation model. Chapter 6 deals with the design of joints. Chapter 7 deals with thermal and mechanical analysis by the advanced calculation model. Chapter 8 gives four design examples showing how a complete and sometimes complex structure can be designed using the concept of element or substructure analysis. [less ▲]

Detailed reference viewed: 182 (2 ULg)
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See detailBehaviour of steel pallet rack structures under exceptional loading conditions - partial report
zaharia, raul; Franssen, Jean-Marc ULg

Report (2000)

In this report, the general context of steel storage rack systems subjected to fire is first introduced. The second section of the report is dedicated to the numerical finite element modelling of the ... [more ▼]

In this report, the general context of steel storage rack systems subjected to fire is first introduced. The second section of the report is dedicated to the numerical finite element modelling of the resistance and stability behaviour of a system in a particular building under static loading at ambient temperature. [less ▲]

Detailed reference viewed: 55 (0 ULg)