Article (Scientific journals)
Hybrid fire testing in a non-linear environment using a proportional integral controller
Mergny, Elke; Gernay, Thomas; Drion, Guillaume et al.
2019In Journal of Structural Fire Engineering, 10 (2), p. 245-258
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Keywords :
Hybrid fire testing; Stability; Control system stability; Controllers; Convergence of numerical methods; Equations of state; Fires; Linear control systems; Steel construction; Steel testing; Stiffness; Structural frames; System theory; Two term control systems; Control problems; Design/methodology/approach; General stabilities; Proportional controller; Proportional integral controllers; Stability condition; Stiffness changes; Varying stiffness; Process control
Abstract :
[en] Purpose: The purpose of this paper is to propose a new framework based on linear control system theory and the use of proportional (P) controller and proportional integral (PI) controller to address identified stability issues and control the time properties in hybrid fire testing. Design/methodology/approach: The paper approaches hybrid fire testing as a control problem. It establishes the state equation to give the general stability conditions. Then, it shows how P and PI controllers can be incorporated in the system to maintain stability. A virtual hybrid fire testing is performed on a 2D steel frame for validation and to compare the performance of the controllers. Findings: Control system theory provides an efficient framework for hybrid fire testing and rigorously formulate the stability conditions of the system. The use of a P-controller stabilises the process, but this controller is not suitable for continuous change of stiffness of the substructures. In contrast, a PI-controller handle the stiffness changes. The results of a virtual hybrid fire testing of a 2D steel frame shows that the PI-controller succeeds in reproducing the global behaviour of the frame, even if the surrounding structure is non-linear and subjected to fire. Originality/value: The paper provides a rigorous formulation of the general problem of hybrid fire testing and shows the interest of a PI controller to control the process under varying stiffness. This methodology is a step forward for hybrid fire testing because it allows capturing the global behaviour of a structure, including where the numerical substructure behaves nonlinearly and is subjected to fire. © 2019, Emerald Publishing Limited.
Disciplines :
Civil engineering
Author, co-author :
Mergny, Elke ;  Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Gernay, Thomas ;  Johns Hopkins University > Department of Civil and Systems Engineering
Drion, Guillaume ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation
Franssen, Jean-Marc  ;  Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Language :
English
Title :
Hybrid fire testing in a non-linear environment using a proportional integral controller
Publication date :
2019
Journal title :
Journal of Structural Fire Engineering
ISSN :
2040-2317
Publisher :
Emerald Group Publishing Ltd.
Volume :
10
Issue :
2
Pages :
245-258
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 May 2020

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