2. •Ridge Beam sits below the rafters. Crescent roof trusses 3. Repair the truss by following the information provided in the TRDD exactly. Framing of a Roof Supported Truss. 4. – If the truss is already installed, shore up the truss to relieve any load. Common Roof Trusses 5. Parts of a Roof •A Ridge Board is a horizontal member of the roof frame. Make sure to use the correct materials as specified. igure 12 russ Analysis and Member Design and a truss shape has been chosen, the truss can be s are subjected to combinations … This technical drawing is modelled in CAD software and analysis then takes place. Attic trusses are designed to provide living areas within the roof space. The top chords are straight. and roof design. In traditionally constructed roofs, the roof may also require added support in the form of roof trusses. trusses. Various loads acting over the truss are calculated using the provisions of IS875 (Parts … A roof must be strong to withstand snow and wind loads. Truss roof framing is cov-ered in Section 17.4. Prior to beginning the repair, lay the truss flat on a solid, level surface. Components of a Steel Roof Truss: Supported by lally columns. Triangular roof trusses may be identified by the web bracing used and the simple triangular geometric shape used throughout their design. This will depend upon the size of the roof and the type of roof covering the roof has to support. •Transfers the load of the roof through the raftersto walls below. 8. Figure 3 Technical drawing of truss and column assembly discussion of the types and parts of roof trusses. 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. TERMINOLOGY LEARNING OBJECTIVE: Upon completing this section, you should be able to identify the types of roofs and define common roof framing terms. 5. girder trusses) or combined with other components, such as glulam, LVL, PSL and steel beams. 1. The point at which all the rafters are attached to. 6. Roof trusses other than these 1. They can be connected to other trusses (i.e. The primary object of a roof in any climate is protection from the elements. The roof must be appropriate for the climate in which the house is being built. A roof … In modern double roof construction, the whole of the roof is constructed of lightweight roof trusses called trussed rafters (See Module 4). • 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 The various steps involved in the design of truss members are as follows: 1. 6.8 Compound Trusses; Determinate vs. Indeterminate Trusses. 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 … Triangular roof trusses 2. Draw FBD of the 2 different parts of the truss Enforce Equilibrium to find the forces in the 3 members that are cut. Triangular Roof Trusses: These contain the most common types of trusses used for building. Method of sections: Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page 8 . 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. This is demonstrated later. In North America, wood roof One of the technical drawings of the building is shown in figure 3 below. Depending upon the span, required lighting, and available roofing material, the type of truss is selected and a line diagram of the truss is sketched 2. The main purpose of a roof is to protect the house in all types of weather with a minimum of maintenance. 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