TASEFTASEF - A computer code for calculating temperature in structures exposed to fire
TASEF (Temperature Analysis of Structures Exposed to Fire) is a special purpose program for calculating temperatures in structures exposed to fire. The program is a tool for structural fire safety design and product development as well as for research and educational purposes. It can also be used to predict and extrapolate test results.
The temperature distribution is obtained by a numerical scheme based on the finite element method. Nonlinearities due to boundary conditions and material properties varying with temperature are considered. Two-dimensional and axisymmetrical structures comprised of one or more materials as well as voids may be analysed.
TASEF is internationally well known and has been used in several countries by consulting engineers, designers and research engineers.
TASEF has been developed specifically to calculate heating of assemblies exposed to fire conditions
Special features for fire problems include:
- Fire boundaries are easily described.
- Heat exchange by convection and radiation between surfaces around voids can be calculated.
- Problems with materials having latent heat due to evaporation water can be analysed.
- A computational scheme that yields short execution times even for large problems is employed.
- Temperatures of fluids inside pipes can be calculated.
Prescribed boundary temperature, heat flow and convective and radiative heat transfer can be specified. The temperature of boundary nodes or the surrounding gas can be defined as constant or time dependent. The fire exposure is expressed as time-temperature relationships. The ISO 834 or EN1363-1 standard fire curve as well as parametric fire curves coded into the program and may be specified using simple input commands.
Material properties may vary with temperature. The influence of latent heat due to water evaporation may be accurately considered.
Input data to TASEF is specified using either a menu based prepocessor INTASEF or a windows based graphical interface PreTasef.
Automatic mesh generator
Rectangular finite element meshes are generated automatically with a minimum of input. Grid lines are automatically generated at the faces of specified sub-regions. Additional specified mesh lines can easily be added to the mathematical mesh. Grid refinement is easily made using simple commands. Voids and cut outs may be defined and triangular elements may be added. Also right angle triangular elements may be used.
Results are easily interpreted
Computed nodal temperatures are printed at specified times in such a way that their positions are easily identified and a good general view of the results is readily obtained.
Time-temperature curves for different nodes, isothermal lines and temperature fields at certain times can then be graphically illustrated.
TASEF is coded in Visual FORTRAN 90/95 and it is available for use on PCs under Windows2000, Windows95/98 and Windows NT. Other versions are presently not available.
The user manuals contain comprehensive instructions for running the program with worked examples. The meanings of input parameters are thoroughly clarified and their units provided in the manuals.
Examples of structures that have been analysed by TASEF
Hollow core slab
Concrete slab on beam
Insultated steel column
Example of references reporting applications of TASEF
- Milke, J. A. "Analytical methods for Determining Fire Resistance of Concrete Members", SFPE Handbook of Fire Protection Engineering, Second Edition, National Fire Protection Assoociation, Quincy, Massachusetts and Society of Fire Protection Engineers, Boston, Massachusetts, 1995.
- Wickström, U. and Pålsson, J. " Scheme for Verification of Computer Codes for Calculating Temperature in Fire Exposed Structures", SP Swedish Testing and Research Institute, SP REPORT 1999:36, Borås 1999.
- Thomas, G. C., "Fire Resistance of Light Timber Framed Walls and Floors", Fire Engineering Research Report 97/7 (Chapter 3), School of Engineering, University of Canterbury, New Zealand, 1997.
- Gerlich, J. T. C., Collier, P. C. R. and Buchanan, A. H., "Design of Light Steel-framed Walls for Fire Resistance", Fire and Materials, vol. 20, pp 79 - 96, (1996).
- Wickström, U., "Calculation of heat transfer to structures exposed to fire - shadow effects", Interflam 2001. Edinburgh, UK, 2001.
- Wickström, U. and Tuovinen H., "Calculation of Fluid Temperature in Circular Tubes Using Tube-TASEF", SP Swedish Testing and Research Institute, SP REPORT 1997:29, BORÅS 1997.