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Boomerang and Jungle pedestrian bridges in Oslo
Author(s) -
Mo Gaute,
Rando Mario,
Overton Kathleen
Publication year - 2019
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.1028
Subject(s) - deck , structural engineering , bridge (graph theory) , span (engineering) , pedestrian , engineering , girder , civil engineering , medicine
The Boomerang and Jungle pedestrian bridges form part of a new pedestrian and cycle path, passing through an urban forest and over the Outer Ring Road to the east of Oslo. The main goal for the design team was to integrate the bridges' architecture within the natural environment and to cause the minimum impact during the construction period. The 85m long Boomerang Bridge crosses the ring road with a 22.5m span. In total the bridge comprises of four spans, with a continuous steel box girder of asymmetric cross‐section. The three intermediate supports are slender, circular steel hollow sections to have minimal architectural impact on the surrounding forest. The bridge is fabricated from Cor‐ten weathering steel to avoid the need for painting and to minimise future maintenance. The bridge railings are vertical Cor‐ten steel plates topped with a stainless‐steel handrail. A notable feature of the erection process was that the traffic on the road below the bridge was maintained throughout. The Jungle Bridge is a simple suspension bridge spanning 36m over a small river. The main structural elements are parabolic, locked coil cables, four at deck level and two at handrail level. The 2m wide deck is formed from slip‐resistant perforated steel panels, supported off a laterally stiff steel framing system, based on a 1.5m modulation of crossbeams and handrail posts. The design intent was to maximize the use of prefabricated lightweight elements to facilitate the bridge erection and minimize the impact on the natural environment. Elements are hot‐dip galvanised for corrosion protection. Due to the lightness of the bridge a detailed analysis of the accelerations due to pedestrian‐induced vibrations was performed to assess the comfort level for bridge users. The project won in 2017 the Norwegian Steel Construction Award and is nominated for the World Architecture News’ Best Bridge Award 2017.