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The Bridge over the Ijssel- a Railway Bridge in Line with the Landscape Hans-Joachim Casper" Keywords: railway bridge, steel structure, design and build. Abstracts: The new 930m long railway bridge over the Ijssel is an essential part of the Hanzelijn a 50km long, double-tracked newly built line in the Netherlands between Zwolle and Lelystad at the Ijsselmeer. The bridge is the winning design of a design and build competition and an outstanding example of architecturally appealing bridge construction. 1. Introduction The new Ijssel Bridge is part of the Hanzelijn a 50km-Iong newly built railway line in the Netherlands between Lelystad at the Ijsselmeer and Zwolle in the interior. 35155
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The Hanzelijn provides an efficient transport connection between the north of the country and the conurba-tion areas of Amsterdam and Rotterdam in the wesl Construction of the double-tracked line started in 2007. It is designed for passenger and freight traffic and design speed is 160km/h. Fundamental project of this east-west connection is the crossing of the Ijssel between Zwolle and Hattem. The double-tracked structure crosses the Ijssel, its foreland areas and the Gelderse Dijk with span widths of33.13 + 4 x 40.0 + 75.0 + 150.0 + 75.0 + 10 x 40.0 + 33.34 ~ 926.47m. In the layout, on the side ofHattem, up to the Ijssel the bridge runs in a straight line to which is linked a clothoid on the side of Zwolle that transitions into a radius in front of the abutmenl A particularity of the bridge is the switches in every track leading to a wideuing of up to 7.65m of the superstructure at the abutment Hattem. The client ProRaiI, Utrecht, engaged the construction consortium Welling-Ziiblin to-gether with the architects Quist Wmtermans, Rotterdam, and the design joint venture SSF, Munich, and ABT, Arnbeim, to build the railway bridge. The steel superstructure was pro-duced by Max Bog!, Amsterdam. 2. Awarding Procedure and Project Requirements The bridge is the winning design of a design and built competition of five prequalified con-sortiums each consisting of construction companies, architects and designers. Project requirements defined by Ibe client in Ibe tender documents consisted mainly of functional and technical requirements in combination wilb additional conditions of so-called RAMS requirements.
RAMS requirements are Reliability requirements, i.e. a minimum period of time in which Ibe structure must fulfil its function wilbout breakdown, Availability requirements standing for Ibe life cycle in consideration of accepted failures and planned decommissioning in view of maintenance works, requirements regarding possibilities and duration of Mainte-nance works and Safety requirements Ibat are to be guaranteed by planning protective meas-ures, rescue accesses, escape routes or fire extinguishing devices. As life cycle for Ibe main load-bearing structure 100 years were stipulated, and 25 to 50 years for secondary construction elements and technical equipment depending on Ibe inpidnal element. Further requirements were related to construction execution oflbe bridge such as meet-ing construction time limits and respectiog traffic routes, noise regulations, protection of cables and conducts or water protection. Central Ibeme of Ibe interactive competition was to obtain a high-quality and aeslbetic structure achieving high acceptance amongst Ibe population. In addition to technical and economic aspects, Ibe outside design comprising Ibe choice of Ibe load-bearing system was Ibus put in Ibe foreground. The bidding joint venture established Ibe design in close dialogue wilb Ibe client. Dur-ing regular meetiogs Ibe state of Ibe design was presented to Ibe client and Ibe different companies had Ibe chance to ask questions and clarify Ibe construction task. Questions were answered in written by Ibe client. The client Iboroughly analysed static-structural and opera-tional aspects as well as design, durability and maintenance. In addition to wanting to obtain Ibe best offer in terms of architecture and economic efficiency, Ibe client focused on Ibe con-dition of a gnaranteed transparent technical and financial basis in view of flawless construc-tion processes and commissioning of a functional, durable and maintenance-friendly bridge. The required extent of final offer documents included detailed descriptions, specifica-tions and offer price, detailed drawings of Ibe bridge, construction schedules, a substantia-tion of Ibe design work wilb systems engineering documents as described below as well as a bridge model. For Ibese services, each participant was reimbursed wilb 0.75% oflbe indicated maxi-mum construction costs. Awarding criteria were wilb 65% Ibe architectural, functional and technical design and wilb ouly 35% Ibe costs. The maximum costs oflbe bridge were limited to 50 Mio. €.