UTFORMNING AV DRAGBAND FÖR OKÄNDA OLYCKSLASTER : En undersökning om praktisk tillämpning av EKS 11 för flerbostadshus i konsekvensklass 2b

Sammanfattning: Introduction: An investigation about how ties are designed for accidental loads according to Eurocode 1: SS-EN 1991-1-7 and Eurocode 2: SS-EN 1992-1-1, with attention on ESK 11, the Application of the European construction standards by the National Board of Housing. Eurocodes are the European standard for how buildings should be constructed. They are treated to some extent in the EKS, who makes adaption to the rules with consideration to the Swedish environment. And by the National Board of Housing, EKS becomes a norm in Sweden and is applied to construction. Accidental loads can be diminished by a minimum to the largest of Eurocode 1 and 2 with changes of EKS. Purpose: To investigate and clarify how ties for accidental loads are designed and arranged. Method: For the relevancy of this thesis a major focus is to study Eurocode 1 and 2, side by side with EKS 11. These will be compared to real construction drawings provided by Kadesjös Ingenjörsbyrå AB and additionally be confirmed with manual calculations for a fictitious building made by the authors. Results: The results present proposals for how different ties under tension should be defined, designed, and placed. Together with an overall solution for designs, and calculations of a fictitious building that meets the same requirements as for the buildings in the study objects. Whether there are any conflicts between regulating documents will also be brought up. Conclusion: In the event of accidental loads ties shall act as a measure to prevent the progressive race caused by an accident, by strengthening the connections between different structural parts. The ties that are studied in this thesis are categorized by either of two definitions, direct ties, and indirect ties. Where direct ties are only used for the purpose to function as a tie for accidental loads, and where indirect ties could be used by already existing reinforcement. The investigation shows that most of the ties that are required for accidental loads can be designed with indirect ties, that not all of them are necessary and that the required dimensions are low.