Truss Bridges - Structural Steel.

Through trusses are used for medium spans where a limited construction depth precludes use of a composite deck bridge.They are suitable in flat terrain to reduce the height and length of approach embankments and for railway bridges where existing gradients cannot be modified.A truss may be unacceptable visually; a bowstring truss is an alternative solution. For short spans and medium spans up to 50m, trusses are generally less economic than plate girders because of higher fabrication cost.

They are therefore adopted only where the available construction depth is not sufficient for composite beams. (See Fig. 4.7.)

 Truss bridge: (a) elevation (b) cross section (c) arrangements for sliding into position.
Fig. 4.7 Truss bridge: (a) elevation (b) cross section (c) arrangements for sliding into position.

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