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Effective stress method to be used in beam finite elements to take local instabilities into account
Franssen, Jean-Marc; Cowez, Baptiste; Gernay, Thomas
2014In Fire Safety Science 11
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Keywords :
structures in fire; local buckling; beam finite elements; bernoulli; slender cross-section; numerical modeling; steel
Abstract :
[en] In the fire situation, Bernoulli beam finite elements are the workhorse used in numerical calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class 1 (stocky) sections whatever the slenderness of the plates that make the section, allowing the development of a full plastic stress distribution in the section which leads to complete plastic redistribution along the members in the structure. This type of element is thus not adapted for modeling structures that contain slender sections of class 2, 3 or 4. This document presents a new approach to take into account local instabilities in slender sections using beam finite elements. The new approach is based on an effective constitutive law of steel. The effective law is not symmetrical with respect to tension and compression because, in tension, the stress-strain relationship is not modified whereas, in compression, the stress-strain relationship is modified.
Disciplines :
Civil engineering
Author, co-author :
Franssen, Jean-Marc  ;  Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Cowez, Baptiste;  Université de Liège - ULiège > ArGEnCo > Structural Engineering
Gernay, Thomas ;  Université de Liège - ULiège > ArGEnCo > Structural Engineering
Language :
English
Title :
Effective stress method to be used in beam finite elements to take local instabilities into account
Publication date :
February 2014
Event name :
11th International Symposium on Fire Safety Science
Event organizer :
University of Canterbury
Event place :
Christchurch, New Zealand
Event date :
February 10 - 14, 2014
Audience :
International
Main work title :
Fire Safety Science 11
Pages :
544-557
Peer reviewed :
Peer reviewed
Commentary :
Please donwload the erratum
Available on ORBi :
since 23 January 2014

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