Lattice girder

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A lattice girder is a form of box beam commonly made using two plate girders for two opposite sides and a diagonal lacing of strips or L–channel for the other two sides. The lacing elements are attached using either hot rivets or threaded locator bolts. Such beams may also be constructed using four L–channels and lacing on four sides. This type of design has been supplanted in modern construction with welded or bolted box beams, which while using more material can be constructed with lower labor costs using automated machinery and are also more resistant to extreme seismic stress.

[edit] Some structures employing lattice girders

• The Eiffel Tower
• The obsolesent eastern span of the San Francisco-Oakland Bay Bridge. The western span has been retrofitted with bolted plates replacing the lacing for added strength.
• Hibaldstow Bridge
• The internal structure of the Statue of Liberty

[edit] See also

• Lattice truss bridge - an extension of the concept to form a deep truss.