DECEMBER 2022CONSTRUCTIONBUSINESSREVIEW.COM8IN MYOPINIONDesigning large infrastructure projects ­ bridges, tunnels, ports etc. ­ includes fulfillment of various requirements from codes and standards to ensure that the structural safety is not compromised and further to ensure that the structure is not disrupted in longer periods. It is however noted that these requirements can be fulfilled in various ways when also cost issues must be considered. Operational Risk Analysis (ORA) is a way to document that safety, availability and financial requirements are all fulfilled when the final design has been chosen, the construction project is finalized, and the bridge is in daily operation.The risk-based approach has been used for design and construction of the Norwegian Public Roads Administration (NPRA) floating bridge `Bjørnafjorden Floating Bridge' crossing the 500 m deep Bjørnafjord between Stavanger and Bergen­a 5 km long bridge to be built on 38 floating pontoons and a land-based pylon. Floating bridges are quite unusual in bridge design and the structural behavior of the bridge deviates significant from more traditional bridge designs and especially risks related to ship traffic accidents challenges the design. For this reason, the risk-based approach has been used to ensure that selected design alternatives do not pose unacceptable high risks for user safety or By Soren Randrup-Thomsen, Head of Department, Risk & Safety, Ramboll DenmarkDESIGN AND OPERATION OF LARGE INFRASTRUCTURE PROJECTS - A RISK-BASED APPROACHBy combining the frequency and the consequence for a given hazard, a risk contribution in terms of number of fatalities per year or number of disruption hours per year is estimated
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