Naslov
Numerical model for predicting the behaviour of structures under fire

Autori
Torić, Neno ; Peroš, Bernardin ; Harapin, Alen ; Boko, Ivica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
5th International Conference on Advanced Computational Engineering and Experimenting (ACE-X 2011) : abstracts / - , 2011

Skup
International Conference on Advanced Computational Engineering and Experimenting (5 ; 2011)

Mjesto i datum
Vilamoura, Portugal, 03.07.2011. - 06.07.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
fire; numerical model; heat transfer; finite element; steel

Sažetak
The paper presents a numerical model and a computer program for predicting the behaviour of structures under the influence of high temperatures (fire). Behaviour of the structure or a structural element under fire depends on factors such as the time-temperature curve as a representation of fire action, the development and spread of heat in the structure over time, the level of mechanical stress in the structure (load level), the mechanical properties of the material at high temperatures and the restraint conditions at the supports. All of these factors need to be included in the model to obtain a clear insight of the physical processes that occur during the fire. The calculation procedure is based on an iterative process that is repeated for each time-step. At each time-step the structure is sectioned based on the temperature distribution so that the stiffness for each element/cross-section can be determined. Element/cross-section stiffness is based on temperature dependant stress-strain curves taken from literature as well as those determined by experiments. The adjusted stiffness is used to calculate the global 3D system for external load and check (the change in) the global displacement vector. The developed model consists of three complementary parts (modules). The first part (first module) is a standard linear model for the calculation of inner forces of 3D beam structures under external static forces. The second part (second module) represents a 3D transient, nonlinear heat transfer model that calculates the temperature distribution along the beam element, as well as the temperature distribution in the cross-section of the beam. The third part represents a module that calculates the stress and strain components for each of the cross sections, as well as section stiffness. Finally, a simple numerical example of a simply supported steel beam model is presented to show the efficiency and the accuracy of the developed algorithm and software.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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