A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Termisk analys av brandutsatta tunnelkonstruktioner med olika ytegenskaper
Tunnels are constructed to withstand a fire during a designed time period.In Sweden tunnels are dimensioned according to the Hydrocarbon (HC)temperature curve during 180 minutes. Fires in tunnels are different fromfires in compartments; the temperatures in a tunnel are more severe. Thegas temperatures may be higher than fires in compartments, which mayaffect the tunnel construction. A worst case scenario is that it may collapse.This will have a devastating outcome both for the tunnel owners and thefuture traffic situation. There are different ways of protecting tunnelstructures. One is to use insulation called Promatect-T boards. The productis used worldwide and used for analysis in the present study.The aim of the study is to gain knowledge about thermal impact on tunnelstructures. A finite element program called TASEF (Temperature Analysisin Structures Exposed to Fire) has been used throughout this study. InTASEF, tunnels have been dimensioned and different thermal loads hasbeen used as an input to see what temperatures are obtained in thereinforcement bars inside the concrete in the tunnel construction. Averification of a part in TASEF called TASEF-tube has been made, and ananalysis of the most optimal element size in TASEF-tube was also carriedout.During the verification of TASEF-tube, a comparison between thetemperatures at the end of the tunnel obtained from TASEF-tube and thetemperatures at the end of the tunnel obtained from an equation made fromDeWitt and Incropera was made. The length of the tunnel, the radius of thetunnel, the ventilation velocity and the heat transfer coefficient werechanged to see when the temperatures would correlate with each other.That occurred when a long tunnel and a high value of the heat transfercoefficient was used. Overall, TASEF and TASEF-tube is a quite goodprogram for dimensioning simple tubes to see the temperature flow insidethem.The optimal element size was analysed and calculated to three m, whichgave a relative error of 0.2%. Since the calculation times in TASEF are ...
Termisk analys av brandutsatta tunnelkonstruktioner med olika ytegenskaper
Tunnels are constructed to withstand a fire during a designed time period.In Sweden tunnels are dimensioned according to the Hydrocarbon (HC)temperature curve during 180 minutes. Fires in tunnels are different fromfires in compartments; the temperatures in a tunnel are more severe. Thegas temperatures may be higher than fires in compartments, which mayaffect the tunnel construction. A worst case scenario is that it may collapse.This will have a devastating outcome both for the tunnel owners and thefuture traffic situation. There are different ways of protecting tunnelstructures. One is to use insulation called Promatect-T boards. The productis used worldwide and used for analysis in the present study.The aim of the study is to gain knowledge about thermal impact on tunnelstructures. A finite element program called TASEF (Temperature Analysisin Structures Exposed to Fire) has been used throughout this study. InTASEF, tunnels have been dimensioned and different thermal loads hasbeen used as an input to see what temperatures are obtained in thereinforcement bars inside the concrete in the tunnel construction. Averification of a part in TASEF called TASEF-tube has been made, and ananalysis of the most optimal element size in TASEF-tube was also carriedout.During the verification of TASEF-tube, a comparison between thetemperatures at the end of the tunnel obtained from TASEF-tube and thetemperatures at the end of the tunnel obtained from an equation made fromDeWitt and Incropera was made. The length of the tunnel, the radius of thetunnel, the ventilation velocity and the heat transfer coefficient werechanged to see when the temperatures would correlate with each other.That occurred when a long tunnel and a high value of the heat transfercoefficient was used. Overall, TASEF and TASEF-tube is a quite goodprogram for dimensioning simple tubes to see the temperature flow insidethem.The optimal element size was analysed and calculated to three m, whichgave a relative error of 0.2%. Since the calculation times in TASEF are ...
Termisk analys av brandutsatta tunnelkonstruktioner med olika ytegenskaper
Sjödin, Veronika (author)
2014-01-01
Theses
Electronic Resource
English
DDC:
624
| TIBKAT | 1964
Apropa: Rasmus Waern om olika historier om historien
British Library Online Contents | 2004