Story Bridge Rehabilitation Study--Concrete Deck Slabs

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Title: Story Bridge Rehabilitation Study--Concrete Deck Slabs

Author(s): D. L. Beal and R. J. Heywood

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 395-411

Keywords: bridge decks; bridges (structures); corrosion; quality control; rehabilitation; repairs; Construction

Date: 11/1/1991

Abstract:
The Story Bridge is a densely trafficked, important corridor over the Brisbane River. Built in the 1940s, the bridge (particularly the southern approaches) are showing signs of distress. The main span of the bridge consists of two steel cantilever trusses with a drop-in steel span. The overall length of the main span is 446 m. The southern approach spans consists of steel trusses, concrete girders, and a grillage of beams with a concrete deck, for a combined length of 515 m. There have been longstanding concerns with respect to some elements of the bridge. These are expressed most visibly by extensive cracking and spalling of the concrete. In some locations primary reinforcement is completely rusted through, leaving doubts about the safety of local areas of the bridge. Some rocker bearings appear to be partially or totally seized. The investigation involved an historical review of the design and construction details used in the bridge. Design loads were compared with modern standards. The concrete quality was investigated and the level of corrosion determined. These are reported in the context of the original specifications and details, and repair procedures recommended.