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6.8 Compound Trusses; Determinate vs. Indeterminate Trusses. The roof must be appropriate for the climate in which the house is being built. In traditionally constructed roofs, the roof may also require added support in the form of roof trusses. GANG-NAIL Truss System From these examples, it can be readily appreciated that timber trusses are very effective structural components. Prior to beginning the repair, lay the truss flat on a solid, level surface. Method of sections: Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page 8 . A roof must be strong to withstand snow and wind loads. When a roof is to be provided for a building which does not have interior supports and the exterior walls are more than 12 m apart, a roof truss will be a convenient arrangement to support the roof. The main purpose of a roof is to protect the house in all types of weather with a minimum of maintenance. Triangular Roof Trusses: These contain the most common types of trusses used for building. Supported by lally columns. The point at which all the rafters are attached to. This will depend upon the size of the roof and the type of roof covering the roof has to support. Parts of a Roof •A Ridge Board is a horizontal member of the roof frame. Components of a Steel Roof Truss: trusses. The top chords are straight. They can be connected to other trusses (i.e. The various steps involved in the design of truss members are as follows: 1. 4. •Ridge Beam sits below the rafters. girder trusses) or combined with other components, such as glulam, LVL, PSL and steel beams. Crescent roof trusses 3. For many single storey buildings sloping roofs on trusses are common. the roof truss, column support and joints are assumed to be the most crucial parts. Figure 3 Technical drawing of truss and column assembly Triangular roof trusses 2. • Factory-manufactured components to exact span requirements • Reduced HVAC, plumbing, and electrical subcontractor time on job • No column pads to pour, no steel beams and posts to place • Job site material pilferage and cutting waste reduced TM ADVANTAGES OF TRUSSES OVER CONVENTIONAL FRAMING Roof-Floor Truss manual 7/31/08 10:43 AM Page 5 – Seek professional guidance if anything is unclear. Draw FBD of the 2 different parts of the truss Enforce Equilibrium to find the forces in the 3 members that are cut. Attic trusses are designed to provide living areas within the roof space. 7 Buckling Calculations 2 weak cr 2 EI P ( L) buckling force π = = k effective length factor 1for an ideal truss member = = k k. 8 Types of Trusses Basic Truss Element ≡three member triangular truss Simple Trusses – composed of basic truss … Roof trusses other than these 1. 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