Probability based assessment of bridge exposed to extraordinary circumstances

Summary, in English

Considerations of robustness for structural bridge systems subject to accidental circumstances are discussed in this paper. An overview of the framework for the assessment of structural robustness is given highlighting the various features vital to its implementation. The application of probabilistic risk based methodology for the investigation of system effects from rare exposure events is considered for a multi-span concrete bridge crossing multiple rail tracks as well as roads. Calculations are performed to ascertain and quantify these responses; this includes the investigation of impacts from derailed train traffic. The probability of such events occurring is estimated based on statistical data, an examination of subsequent propagating actions is carried out based on mechanical and structural considerations and the overall system response gauged. The potential consequences are then quantified and the corresponding risks associated with these events determined. Conclusions drawn here include the significance of utilizing probabilistic risk assessment methods and design strategies which reflect considerations of robustness of systems subject to rare exposure events with high con-sequences. Current design guidelines for accidental loading used for design of new bridges were also evaluated on the basis of the case study.

• Författare: Ivar Björnsson; Sven Thelandersson; Kurt Petersen
• Avdelning/ar: Avdelningen för Konstruktionsteknik; Avdelningen för Brandteknik; Avdelningen för Riskhantering och Samhällssäkerhet
• Publiceringsår: 2011
• Språk: Engelska
• Dokumenttyp: Konferensbidrag
• Ämne: Building Technologies
• Nyckelord: KstrStructural; robustness; risk; exposure; consequence; probability; rare; bridge
• Conference name: 11th International Conference on Application of Statistics and Probability in Civil Engineering
• Conference date: 2011-08-01
• Conference place: Zurich, Switzerland
• Status: Submitted