Structural Design Steel Roof Truss

Steel roof truss design calculator hood roof bonnet roofing systems are basically a mansard roof backwards.

Structural design steel roof truss.

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. 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. Long span curved roof trusses. The standard roof truss spacing is 2.

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. 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. Parallel trusses are used for deep roofs whereas triangular are usually employed in the trusses with steep pitches. 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. Different steel roof truss designs are prepared depending upon the shape of the structure. 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. A truss is essentially a triangulated system of straight interconnected structural elements.

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 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. This is the distance between trusses. The main reasons for using trusses are.

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. Arches are particularly useful with this application creating large enclosed or semi enclosed structures such as aggregate storage facilities barns manufacturing enclosures workshops etc. 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.