Pedestrian Bridge, Rosenburg, Austria
The pedestrian bridge over the Taffa River functions not only as a bridge, but includes a garden toolshed and seating along the platform. Additionally, the delicate top truss chords provide a pedestrian railing along the bridge's length.
The 2019 Austrian Steel Construction Award was presented to both the structural engineering firm KonstruktING GmbH and the architecture firm 4juu architekten for their mutual design of the project.
The pedestrian bridge has a total length of 74 ft, 6 inches with a free span of 50 ft, 4 inches. The top and bottom truss chords consist of 0.20-inch x 3.94-inch solid steel bars. The truss web members are round steel bars 0.71 inches in diameter, arranged between the chords at varying angles and spacing. Depending on the force distribution along the structure, additional web members are placed at necessary locations. The round bars are arranged in four planes, which increase the transverse stiffness.
A thin deck of flat bars and channel sections spans the bottom chords. The hardwood plank flooring is further placed on top of the deck. The pedestrian bridge widens to a Y-shape at the garden entrance. The garden toolshed is integrated at this location.
Due to the low material costs, the pedestrian bridge is an ecologically optimized structure that integrates seamlessly with the surrounding area.
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Plate girder is an economical choice for long spans construction. I-section steel plate girder typically has a deep web to maximize its shear capacity and flange separation, yet thin web to minimize the self-weight. Due to its large height-to-thickness (h/tw) ratio, transverse stiffeners may be required to stiffen the slender web.
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