Long Span Steel Roof Truss Design

The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.

Long span steel roof truss design. This is the distance of the bottom chord of the truss from outside overhang of bearing wall to outside of the other bearing wall. Long span roofs are generally defined as those that exceed 12 m in span. Design of roof purlins. Options to set the roof girders on wood post or concrete wall also available.

They are commonly found in a wide range of building types such as factories warehouses agricultural buildings hangars large shops public halls gymnasiums and arenas. In the engineering and construction industry any truss spanning more than 60 feet is considered to be long span thus requiring engineering consideration per international building code ibc 2015 section 2303 4 trusses for design of. The span in short is the length of the bottom of the truss. The purpose of this article is first to explore and explain various aspects of building with long span open web trusses including manufacturing architectural design options engineering considerations and installation practices and second.

While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. Trusses from 8 to 80 clear spans. 6 for efficient structural performance it is recommended that the truss span to depth ratio be kept between 10 to 15. Factors that affect truss pricing and cost.

Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. Long span roofs can create flexible column free internal spaces and can reduce substructure costs and construction times. Made in the usa. 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.

Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20. Typical roof truss design spans. Pre welded clips on 2 centers for wood or steel secondary framing. Every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project.

When spaced 10ft they will withstand 110mph winds and 32 lbs ft snow load. Some spans have a lower rate per foot than others. A sl series truss is a single slope truss that includes steel girders and steel columns with clear span widths from 10 through 80 with available eave heights of 8 through 20.