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Bridge cranes

In a bridge crane, the pulley system is suspended from a trolley that moves on tracks along one or two horizontal beams that are supported at both ends. The bridge can move along a pair of parallel rails.

Truss Bridge Cranes

To reduce weight and cost,  bridge cranes formed by trusses are often constructed.

This is a steel Vierendeel truss used to store and retrieve.

Double truss single bridge crane

In this type, the strength and stability are provided by a pair of plane trusses connected by horizontal elements. Bracing is provided to increase stability. This model handles 3 to 10 Tons with spans up to 100 ft. (33 m)

Truss Bridge Crane configuration.

In a truss bridge crane, the pulley system is suspended from a trolley that moves on tracks along one or two horizontal beams that are supported at both ends. The bridge can move along a pair of parallel rails.

Crane Capacities.

Typical load capacities in truss crane bridges vary between 1 and 10 Tons. This particular one spans 92 ft (approx. 30 m). The building was too low for traditional box girder crane design, so the truss girder was the appropriate choice.The truss had to be designed shallow enough for the merchandise to stay below the truss yet high enough to get on and off trucks.

   
This research was supported by NSF-CCLI, DUE-0736828: "A Computer-Based Simulated Environment to Learn on Structural Failures in Engineering"