truss types

lesson 13 (2 hours) theme: truss types/ prepositions truss types trusses work much like beams: they carry a combination of compression and tension forces. the main difference is that trusses are less heavy than beams. beams use extra material in some areas; these areas don’t use the full strength available to them. engineers and builders can determine which portions of beams can be removed. the resulting truss concentrates the forces into many smaller members and eliminates the under-stressed areas of beams. a truss is made of many smaller parts. once constructed of wooden timbers, and later including iron members, most truss bridges are built of metal. as for the placement of the travel surface in relation to the superstructure truss …

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