Within the usual contributions the company makes with Polytechnic University of Catalonia, there were 2 projects race to Escuela Superior de Ingenieros Industriales de Barcelona promoted by the current Vircop engineering department.
Both projects deal with the problems of metal structures under the action of fire, knowing that the new regulations and the Technical Code and the Eurocode 3 allows the use of advanced calculation methods instead of more traditional and conservative approaches, in what has become known as the Fire Safety Engineering (ISAI).
As the subject of the two projects were proposed a concept of a building consisting of terraced industrial units usable area between 150 and 250 m2 , compartmentalized by the use of precast concrete.
The first project, ' simulation using computational fluid mechanics of fire scenarios in real industrial sites ', by Adrien Dufour, a study and advanced simulation of different fire scenarios. This project examines the evolution of temperatures in an enclosure taking into account the fire load and sectorisations wall insulation, ventilation, air flows and exhaust gas among other things, and determining the actual fire curves for case 'realistic' (medium risk, intrinsic level 3, 990 MJ / m²) and one case 'critical' (medium risk, intrinsic level 5, 3400 MJ / m²).
One of the conclusions of this study is that, unlike the ISO fire curve (standard fire) when the temperature is always increasing, in real fires the temperature decreases due to lack of fire load between 60 to 90 minutes. In the case of a fire 'realistic' without the intervention of the fighting services, the temperature does not exceed 700 degrees, a temperature value slightly harmful to the metal structure, whereas in the case of a fire 'critical' temperature could reach 1200 degrees.
This study is used as a starting point of the project 'Study thermo-mechanical behavior of a steel structure under the action of fire ' by Teresa Armengou.
By using complex computational tools and simplified methods of calculation are trying to determine the structure of buildings regulatory requirements arcades, and that the collapse of any of the ships on fire did not cause the collapse of neighboring buildings.
different scenarios were analyzed considering the burning fire of a ship and a ship mid corner. The study's findings is that the housing in the worst case holds approximately 18 minutes, and that the force exerted by it on the main portal and sectorization for its collapse is very small magnitude, so that causes no drag neighboring ship. The main structure, protected by elements of passive protection measures (rock wool mortar projected fibrosilicatos, etc), hold the entire fire perfectly, even the most unfavorable for the time required by regulation.
advanced calculation models have improved the designs of ships and conclude that together behave as an industrial pillar type B shares, according to classification RSCIEI. This has been justified that the fire is contained in each bay with no possibility of spread to neighboring buildings or structural collapse in a chain.
Acknowledgements: Dr. Ing Frederic Marimon Carvajal, professor of the Department of Strength of Materials and Structural Engineering of the ETSEIB-UPC .
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