Pratt Truss Roof

Pratt truss n truss pratt trusses are commonly used in long span buildings ranging from 20 to 100 m in span.

Pratt truss roof.

The pratt steel roof truss design is one of the most common designs. The design uses vertical members for compression and diagonal members to respond to tension. The pratt truss originated from caleb and thomas pratt father and son when they applied for a patent in 1844. Horizontal roof rafters.

Beams and columns deflection and stress moment of inertia section modulus and technical information of beams and columns. Hayward building systems located in santa maria ca manufactures quality plated wood trusses for residential multi family and commercial projects. A roof truss is a structural unit designed to frame a roof and to support the roof material interior ceiling insulation and forces caused by snow rain and wind. The pratt truss was patented in 1844 by two boston railway engineers caleb pratt and his son thomas willis pratt.

In a conventional pratt truss diagonal members are in tension for gravity loads. This type of truss is used where gravity loads are predominant see below left. Interestingly their patent had less to do with design and more to do with a method for building trusses. In this fashion they form a pattern of interconnected ns.

This bridge design immediately became widely used during the period when many bridges moved from wood components toward all steel construction designs. Pratt truss this is one of the most popular steel roof truss types and it is quite economical. The pratt truss design remained popular as bridge designers switched from wood to iron and from iron to steel. Often seen in bridges it features several vertical chords that are connected by a diagonal chord.

A lap pool with canyon vistas as well as a garden roof terrace take full advantage of the recreational landscape in which the project is sited. It was designed by the thomas willis pratt 1812 1875 and his father caleb pratt a pair of american engineers just several years after william howe patented his famous howe truss design. This chord runs from the top of one chord down to the bottom of the other chord. Hayward uses only high quality lumber and precision automated saws and assembly equipment to produce roof trusses for any style and size of roofing system.

Components of roof truss.