Structural Design Steel Roof Truss

Long span curved roof trusses.

Structural design steel roof truss.

The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. 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. 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.

Arches are particularly useful with this application creating large enclosed or semi enclosed structures such as aggregate storage facilities barns manufacturing enclosures workshops etc. Parallel trusses are used for deep roofs whereas triangular are usually employed in the trusses with steep pitches. 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. Steel roof truss design calculator hood roof bonnet roofing systems are basically a mansard roof backwards.

Different steel roof truss designs are prepared depending upon the shape of the structure. The main reasons for using trusses are. This is the distance between trusses. The truss is made up of howe truss configuration spaced at 3m intervals.

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. 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. There are parallel and triangular and trapezoidal trusses. 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 standard roof truss spacing is 2. 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.