Karthaus Truss Bridge, Route 879, Centre County–Clearfield County line.

Truss bridge – a bridge whose load-bearing superstructure is composed of a truss. This truss is a structure of connected elements forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or sometimes both in response to dynamic loads.

Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.
That’s engineering

  • strength to weight ratio – load carried at failure divided by the structure weight

Engineering ideas

  • truss, tension, compression, span, strength to weight ratio, pinned joint, geometry, beam, load, failure

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