100 Category 2: Civil Structures 2 Recalculation Prestressed Bridge Drechtbrug - Leimuiden, The Netherlands SE Nebest B V Contact Peter Breevoort (Tauw B.V.) Address Schoonhovenseveer 31-33 2964 GB Groot-Ammers, The Netherlands Website www.nebest.nl Nebest B.V. is an engineering office, specializing in inspections, technical advice and project management of infrastructure, electrical and civil projects. Nebest B.V. has many years of experience and knowledge of inspections and maintenance of concrete, steel and wood constructions. In collaboration with premium foreign institutions, Nebest B.V. has gained exclusive knowledge and experience in the development and practice of new research methods. Nebest B.V. specialises on advice in: visual inspections, labatory research, specialized technical inspections and maintenance advice. The calculations for this project were made in collaboration with Tauw B.V. Owner Province Zuid Holland Architect Unknown General Contractor Nebest B.V. Engineering Office Nebest B.V. Construction Period 1951 - 1952 The bridge was built in 1951/1952 near Leimuiden in Holland over the river De Drecht. The bridge has a total length of 80 m. Due to the increase of traffic loads in the Eurocode, the bridge needs to be replaced by a new bridge in the near future. As part of the building process of a new bridge, the old bridge will be half demolished in the direction of the main girders. The remainder of the old bridge will be used to enable traffic to continue to cross while the new bridge is being built in the same location as the old bridge. SCIA Engineer is used to calculate the forces in the remaining half of the old bridge. For this a 3D model is used. The girders are modelled as ribs with a lot of variable cross sections along the bridge. SCIA Engineer automatically calculates the rigidity of all the cross sections and calculates the forces in all the different load combinations. The main challenge was to recalculate the old bridge based on drawings, data on prestressed girders, model data and calculation results in SCIA Engineer to find out the load capacity of the old bridge.
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