Studie av dimensioneringsmetoder för brandskydd av bärverk i stål: En kostnadsjämförelse
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
High temperatures reduce the yield strength of steel materials and thus the load bearing function. A building whose structures consist of steel must be protected from the heat a fire is developing in order to avoid a collapse of the structure. Special materials are mounted on the steel structure which have the capability to diminish or to delay critical heating in steel. For those protective layers the fire-insulating capacity depends on the material properties and thickness. The basis of design regulates the fire resistance of a structure. The classification depends amongst others on the building's occupancy and design. An analysis of structures exposed to fire is to verify so that the fire resistance is achieved. With the nominal fires as a fire development model, three methods exist to verify a member analysis: the tabulated data, the simple calculation models and the advanced calculation models. This thesis aims to compare the costs effectiveness of these verification methods.To answer the study questions, the three calculation methods are applied to a building projected by Tyréns AB. From the construction drawings a number of columns were selected and the loads that affected them were calculated. A fire protection material was chosen which was feasible to conduct this study and which fulfilled the requirements for this particular building. By applying different methods the thickness of the fire protection required is estimated to achieve the fire resistance. The total costs of the fire protection with the different methods were calculated. The cost was divided into design, materials and installation. The analysis shows that the tabulated data method is least costly. However, differences are small. The simplified calculation model has a trend to give more favorable results and showed that the thickness of fire protection material could be even more reduced on some of the columns. One reason for this may be favorable load assumptions. The advanced calculation method showed the demand of a thicker fire protection with the same load assumption. Some of the study's conclusions are that the selected fire development model, which the verification methods are based on, gives little opportunity for variation in the results. If other fire development models were chosen probably greater variability would be obtained. Similarly, an analysis of several elements and its interactions would also likely lead to different results. Further studies could allow better optimization of fire protection which future research may show.
Place, publisher, year, edition, pages
2013. , 108 p.
Teknik, bärverk, SAFIR, hållfasthet, brandskydd, simulering, stål
IdentifiersURN: urn:nbn:se:ltu:diva-53333Local ID: a5de98de-ec97-459a-9695-0fe8bd3b8dcfOAI: oai:DiVA.org:ltu-53333DiVA: diva2:1026707
Subject / course
Student thesis, at least 30 credits
Fire Engineering, master's level
Validerat; 20130712 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved