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Bridges - 14070_34
STRUCTURAL  STEEL  CONNECTORS - 14070_36

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 1-46.—Completed 40' x 100' x 14' preengineered metal building. Figure  1-47.—Structural  members  of  a  preengineered  metal  building. Again, a lateral bracing system is used between the trusses.  The  pony  truss  span  is  the  same  as  that discussed  in  the  preceding  paragragh.  Because  of  the small depth of the trusses, no top lateral bracing is used. Towers Towers  are  framework  structures  designed  to provide vertical support. They may be used to support another structure, such as a bridge, or they may be used to support a piece of equipment, such as a communi- cation antenna. Since the prime purpose of a tower is to provide vertical support for a load applied at the top, the compression members providing this support are the only ones that require high-structural strength. The rest of  the  structure  is  designed  to  stiffen  the  vertical members  and  to  prevent  bending  under  load.  Primarily, the  bracing  members  are  designed  to  take  loads  in tension and are based on a series of diagonals. A typical trestle tower used in bridge construction is shown in figure 1-45. Preengineered Metal Structures Preengineered  metal  structures  are  commonly  used in  military  construction.  These  structures  are  usually designed and fabricated by civilian industry to conform with specifications set forth by the military. Rigid frame buildings, steel towers, communications antennas, and steel  tanks  are  some  of  the  most  commonly  used structures, particularly at overseas advanced bases. Prerengineered  structures  offer  an  advantage  in  that  they are  factory  built  and  designed  to  be  erected  in  the shortest amount of time possible. Each structure is shipped as a complete kit, including all the materials and instructions needed to erect it. Of the preengineered metal structures available, the one that is perhaps most familiar to the Seabees is the preengineered  metal  building  (PEB)  shown  in  figures 1-46 and 1-47. Figure 1-47 shows the nomenclature of the various parts of the PEB. For definition of this nomenclature, erection details, and other important 1-23







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