85 Category 2: Civil Structures 2 “Verlengde Waal Brug” - Lent, The Netherlands SE AP Owner Gemeente Nijmegen Architect Zwarts en Jansma General Contractor i-Lent Engineering Office Witteveen+Bos Construction Period 07/2013 - 12/2015 The “Verlengde Waalbrug” is an in-situ post-tensioned concrete bridge with a total length of 275 m. With its spectacular double curved lower shell and hybrid foundation, several challenging problems had to be solved. The project succeeded by combining the strengths of Allplan Engineering and SCIA Engineer in a BIM environment. Slices of the Allplan 3D organic model were transported to SCIA Engineer where the complex geometry of the structure was generated with 3,200 shell elements. SCIA Engineer offers the option to combine advanced geometric modelling with all kind of loads, powerful post-processing tools and transparent reporting capabilities all in one model. With SCIA Engineer the interaction between the hybrid foundation and the bridge was investigated, resulting in optimal dimensions. By using the integration function in SCIA Engineer the forces in the longitudinal direction were extracted such that simple cross-sectional checks could be performed, leading to a transparent and verifiable calculation. The dimensions could be quickly tuned with the acting loads. By modelling the bridge deck with shell elements, the beneficial effect of the lower shell acting as a compression arc is taken into account, reducing the amount of reinforcement required. The designed reinforcement in Allplan was used directly, shortening the production path. Witteveen+Bos Contact Wouter Claassen, Arjan Luttikholt, Tim Neurink Address Leeuwenbrug 27 7411 TE Deventer, The Netherlands Website www.witteveenbos.nl Witteveen+Bos offers its clients value-added consultancy and top-quality designs. Over the years, road, rail and hydraulic engineering have created infrastructures characterized by both their large scale and their sophistication. In contrast with these huge projects there are many smaller ones that tend to be invisible to the user. What large and small have in common, however, is the combining of existing and new technologies under highly differing local conditions. At numerous levels Witteveen+Bos has contributed to this development.
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