Structural Design Steel Roof Truss

It is desired to specify the appropriate angle sections that will safely carry the anticipated loading using eurocode design code specified steel grade s 275.

Structural design steel roof truss.

The main reasons for using trusses are. Likewise referred to as kicked eaves a hood roof has 4 sides with a high top incline as well as a much more mild reduced incline offering cover around the sides of your home for a veranda. Arches are particularly useful with this application creating large enclosed or semi enclosed structures such as aggregate storage facilities barns manufacturing enclosures workshops etc. Structural model of truss truss girder self wt 4 05 k 4 05 k 80 ft x 25 ft 2 03 psf 18 03 psf bar joist wt 9 plf pd int dead load at an interior panel point 18 025 psf x 25 ft x10 ft 4 51 k due roof ceiling wt truss girder 9 plf x 25 ft 0 225 k due purlin wt 4 73 k pd.

The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. An advantage of the truss design for roofs is that ducts and pipes that are required for operation of the buildings services can be installed through the truss web. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof. The most common use of trusses is in buildings where support to roofs the floors and internal loading such as services and suspended ceilings are readily provided.

The standard roof truss spacing is 2. There are parallel and triangular and trapezoidal trusses. Parallel trusses are used for deep roofs whereas triangular are usually employed in the trusses with steep pitches. This is the distance between trusses.

Long span curved roof trusses. Design of roof purlins 6 for efficient structural performance it is recommended that the truss span to depth ratio be kept between 10 to 15. Knowing the expected live and dead loads the bearing points overhangs and other structural factors spans over 300 can be engineered with these steel trusses. 1 4 2 general geometry in order to get a good structural performance the ratio of span to truss depth should be chosen in the range 10 to 15.

7 in the layout of truss systems it is more preferable in terms of economy and efficiency to have the shorter members in compression and the longer members in tension. The skeletal structure of a roof system 18 0m long and 7 2m wide is as shown in figure below. The truss is made up of howe truss configuration spaced at 3m intervals.