Long Span Steel Roof Truss Design

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 steel roof truss design.

Factors that affect truss pricing and cost. Made in the usa. This is the distance of the bottom chord of the truss from outside overhang of bearing wall to outside of the other bearing wall. These steel joints are needed to support the overall truss.

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. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. The more complex the truss framework is the greater quantity of these joints will be required. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. When spaced 10ft they will withstand 110mph winds and 32 lbs ft snow load. The span in short is the length of the bottom of the truss. 6 for efficient structural performance it is recommended that the truss span to depth ratio be kept between 10 to 15.

Design of roof purlins. Trusses from 8 to 80 clear spans. Pre welded clips on 2 centers for wood or steel secondary framing. Long span roofs can create flexible column free internal spaces and can reduce substructure costs and construction times.

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. 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. 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. Options to set the roof girders on wood post or concrete wall also available.

Every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project. Some spans have a lower rate per foot than others. Long span roofs are generally defined as those that exceed 12 m in span. Alpine truss designs are engineered to meet specific span configuration and load conditions.

Typical roof truss design spans. We can help you design pole barns to meet so many needs we supply a wide range of steel trusses. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.