Remarkable Strengthening of an old Steel Highway Bridge
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Bibliographic Details
| Author(s): |
Harald Unterweger
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | 17th IABSE Congress: Creating and Renewing Urban Structures – Tall Buildings, Bridges and Infrastructure, Chicago, USA, 17-19 September 2008 | ||||
| Published in: | IABSE Congress Chicago 2008 | ||||
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| Page(s): | 200-201 | ||||
| Total no. of pages: | 8 | ||||
| Year: | 2008 | ||||
| DOI: | 10.2749/222137908796292263 | ||||
| Abstract: |
The paper deals with the remarkable strengthening of a continuous steel plate girder bridge with three spans, built in 1939. Due to increased loads, unscheduled material properties (undersized yield stress) and detected cracks near the ends of cover plates, a lack of load carrying capacity for the main girders was decided. Based on fracture mechanics it was determined that an extensive unloading of the existing structure was necessary - excluding conventional strengthening. Therefore an exceptional solution was chosen. Additional main girders are situated on the upper side of the bridge deck, connected by prestressed tension rods for unloading the existing structure. First the three design variants for the new main girders (plate girder, truss, arch) are presented, analysed in a preliminary study. Finally the chosen solution of a tubular tied arch, selected also due to aesthetic reasons, is represented. The design concept, the structural design and erection are shown. |
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| Keywords: |
steel bridge strengthening prestressed tied arch
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