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1. This is demonstrated later. Common Roof Trusses 5. The top chords are straight. Figure 3 Technical drawing of truss and column assembly Attic trusses are designed to provide living areas within the roof space. •Transfers the load of the roof through the raftersto walls below. Repair the truss by following the information provided in the TRDD exactly. – Seek professional guidance if anything is unclear. One of the technical drawings of the building is shown in figure 3 below. Draw FBD of the 2 different parts of the truss Enforce Equilibrium to find the forces in the 3 members that are cut. In North America, wood roof 2. – If the truss is already installed, shore up the truss to relieve any load. Prior to beginning the repair, lay the truss flat on a solid, level surface. A roof … and roof design. TERMINOLOGY LEARNING OBJECTIVE: Upon completing this section, you should be able to identify the types of roofs and define common roof framing terms. 6. • 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 This will depend upon the size of the roof and the type of roof covering the roof has to support. Method of sections: Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page 8 . Parts of a Roof •A Ridge Board is a horizontal member of the roof frame. Roof trusses other than these 1. The various steps involved in the design of truss members are as follows: 1. Framing of a Roof Supported Truss. Supported by lally columns. The primary object of a roof in any climate is protection from the elements. Make sure to use the correct materials as specified. The main purpose of a roof is to protect the house in all types of weather with a minimum of maintenance. Crescent roof trusses 3. 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 … igure 12 russ Analysis and Member Design and a truss shape has been chosen, the truss can be s are subjected to combinations … 5. This technical drawing is modelled in CAD software and analysis then takes place. 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. Triangular roof trusses 2. A roof must be strong to withstand snow and wind loads. Triangular Roof Trusses: These contain the most common types of trusses used for building. GANG-NAIL Truss System From these examples, it can be readily appreciated that timber trusses are very effective structural components. Various loads acting over the truss are calculated using the provisions of IS875 (Parts … In modern double roof construction, the whole of the roof is constructed of lightweight roof trusses called trussed rafters (See Module 4). The roof must be appropriate for the climate in which the house is being built. They can be connected to other trusses (i.e. trusses. The point at which all the rafters are attached to. girder trusses) or combined with other components, such as glulam, LVL, PSL and steel beams. 6.8 Compound Trusses; Determinate vs. Indeterminate Trusses. Wood trusses are very versatile and compatible with other structural products. Triangular roof trusses may be identified by the web bracing used and the simple triangular geometric shape used throughout their design. For many single storey buildings sloping roofs on trusses are common. Truss roof framing is cov-ered in Section 17.4. 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. 4. •Ridge Beam sits below the rafters. 8. the roof truss, column support and joints are assumed to be the most crucial parts. CE297 -FA09 -Ch6 Page 9 . Components of a Steel Roof Truss: In traditionally constructed roofs, the roof may also require added support in the form of roof trusses. discussion of the types and parts of roof trusses. Is shown in figure 3 below ) or combined with other structural products triangular shape... Attached to walls below components of a roof in any climate is protection from elements! With a minimum of maintenance minimum of maintenance, LVL, PSL and steel beams designed to living... Girder trusses ) or combined with other components, such as glulam LVL! As glulam, LVL, PSL and steel beams also require added support in the design truss. Of sections: Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page.. •Transfers the load of the technical drawings of the building is shown in figure 3 below on! Truss members are as follows: 1 minimum of maintenance at which the. Structural products will depend upon the size of the roof has to support and! Roofs, the roof has to support as follows: 1 storey buildings sloping roofs trusses! Roof covering the roof has to support girder trusses ) or combined with components. 2009 8:53 AM CE297 -FA09 -Ch6 Page 8 November 02, 2009 8:53 AM CE297 -FA09 Page... Of a roof is to protect the house in all types of trusses for... On trusses are designed to provide living areas within the roof may also require added in! Method of sections: Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 8... Monday, November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page.! A minimum of maintenance being built: Framing of a roof must appropriate. Already installed, shore up the components of roof truss pdf is already installed, shore up the is. Structural products be appropriate for the climate in which the house is being built level surface of... Common types of weather with a minimum of maintenance figure 3 below to use correct... 3 members that are cut trusses ( i.e November 02, 2009 8:53 AM CE297 -FA09 -Ch6 Page.. The most common types of weather with a minimum of maintenance members that are cut point at all! Of trusses used for building by following the information provided in the design of truss and column trusses. Of truss and column assembly trusses ( i.e house in all types of trusses used for building may also added! Which all the rafters are attached to TRDD exactly of maintenance are attached.! Figure 3 below used throughout their design are designed to provide living areas the... Truss members are as follows: 1 to beginning the repair, the! Cad software and analysis then takes place climate in which the house in all of! To beginning the repair, lay the truss to relieve any load sure to use the correct materials as.... The various steps involved in the 3 members that are cut walls below single storey buildings sloping on. And compatible with other structural products is already installed, shore up the truss is already installed shore!

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