Structural Design Steel Roof Truss

The standard roof truss spacing is 2.

Structural design steel roof truss.

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. 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. Parallel trusses are used for deep roofs whereas triangular are usually employed in the trusses with steep pitches.

This is the distance between trusses. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. Steel roof truss design calculator hood roof bonnet roofing systems are basically a mansard roof backwards. There are parallel and triangular and trapezoidal trusses.

Long span curved roof trusses. 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. The main reasons for using trusses are. 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.

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. 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. Different steel roof truss designs are prepared depending upon the shape of the structure. Arches are particularly useful with this application creating large enclosed or semi enclosed structures such as aggregate storage facilities barns manufacturing enclosures workshops etc.

The truss is made up of howe truss configuration spaced at 3m intervals. A truss is essentially a triangulated system of straight interconnected structural elements. 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.