SAFIR is a computer program that models the behavior of building structures subjected to fire. The structure can be made of a 3D skeleton of linear elements such as beams and columns, in conjunction with planar elements such as slabs and walls. Volumetric elements can be used for analysis of details in the structure such as connections. Different materials such as steel, concrete, timber, aluminum, gypsum or thermally insulating products can be used separately or in combination in the model.

Take a look at a general presentation of SAFIR capabilities and examples of applications.

SAFIR is being developed at University of Liege by Jean-Marc Franssen and Thomas Gernay.


The gas temperatures produced by fire must be entered as input data in the program (some time-temperature curves recommended in international standards are proposed).

From these gas temperatures, SAFIR will first calculate the evolution of the temperatures in the structure. The structure can be made of different materials such as steel, concrete, timber, aluminum, gypsum or thermally insulating products, used separately or in combinations. These temperatures are stored in different files.

As an example, the video below shows the temperature evolution in a steel section HEB300 filled with concrete (courtesy eca-vaud).

The mechanical behavior of the structure is then calculated on the basis of its geometry, its support conditions, the loads that it must withstand and the strength of the materials, taking into account the progressive increase of temperature. The elevation of temperature in the materials produces thermal elongations together with a reduction of strength and stiffness. As a consequence, the displacements of the structure increase continuously during the course of the fire until collapse.

As an example, the video below shows the behavior of a composite steel concrete structure subjected to fire until collapse of one of the column (courtesy eca-vaud).

User community

Some 130 academic licenses of SAFIR have been sold to research centers and universities in 37 countries throughout the world, including 12 in the USA, whereas 80 companies use it for designing real projects. More than 500 complementary copies of a limited version have been distributed, either for evaluation or for use in masters or PhD programs.

20161202 SAFIR-Worldmap

Free Demonstration Version

A free demonstration version of the software can be obtained. Please download the order form (ORDER FORM FOR A FREE DEMONSTRATION VERSION.PDF), print it, sign it and send it to us ( Your identified copy will be sent by e-mail within a couple of days. The order form states, among other things, that we accept no liability, that you cannot transmit your copy, and that the work produced cannot be used for commercial applications.

This copy cannot be used for commercial applications. It is limited to 2D structures and has a limited number of nodes, elements, etc.


  • Paper by J.M. Franssen and T. Gernay “Modeling Structures in Fire with SAFIR®: Theoretical Background and Capabilities”, submitted to Journal of Structural Fire Engineering
  • Paper by J.M. Franssen “SAFIR. A Thermal/Structural Program Modelling Structures under Fire”, Engineering Journal, A.I.S.C., 2005, Vol 42, No. 3, 143-158.
  • Book "Design of Steel Structures subjected to Fire" by J.M. Franssen and R. Zaharia
  • Network "Secure with Steel" and

More information

Contact(s) :

For licencing, administrative and scientific matters related to SAFIR
Phone : +32 4 366 92 45, fax: +32 4 366 95 34
Mail :

University of Liège
Quartier Polytech 1
Allée de la découverte 9 - Building B52, Parking P52
B-4000 LIEGE1 (Sart Tilman)

Print version Page updated on 02/12/2016