There are different ways of using concrete in a timber bridge (see Figure 1). These including:
- a concrete overlay on an existing timber bridge. A light concrete slab is layed over and supported by the existing timber deck;
- a concrete deck laid on timber beams. A structural concrete deck is cast onto supporting timber beams, often with sacrificial formwork; and
- a composite timber and concrete bridge. The materials are arranged to act as a composite structure, concrete in compression and timber in tension. Shear connectors bind the two together.
This paper will look at how bridges of these types have been built in Tasmania and how they have tended to perform. In particular it will look at:
- successful timber and concrete bridges:
- timber and concrete bridges that have had failures: and
- new practice in overlay construction
To see the full paper, click here.