Pratt Truss Roof

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.

Pratt truss roof.

Often seen in bridges it features several vertical chords that are connected by a diagonal chord. This bridge design immediately became widely used during the period when many bridges moved from wood components toward all steel construction designs. Components of roof truss. 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.

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 type of truss is used where gravity loads are predominant see below left. The pratt steel roof truss design is one of the most common designs. The pratt truss was patented in 1844 by two boston railway engineers caleb pratt and his son thomas willis pratt.

This chord runs from the top of one chord down to the bottom of the other chord. This particular type of truss offers some interesting features mainly thanks to the fact that the vertical members provide tension while the diagonal ones are bringing in compression. The pratt truss design remained popular as bridge designers switched from wood to iron and from iron to steel. In this fashion they form a pattern of interconnected ns.

Pratt truss n truss pratt trusses are commonly used in long span buildings ranging from 20 to 100 m in span. A roof truss is supported by the exterior walls and span the width of the building. The pratt truss originated from caleb and thomas pratt father and son when they applied for a patent in 1844. Beams and columns deflection and stress moment of inertia section modulus and technical information of beams and columns.

Horizontal roof rafters. Interestingly their patent had less to do with design and more to do with a method for building trusses. Pratt truss this is one of the most popular steel roof truss types and it is quite economical. The design uses vertical members for compression and diagonal members to respond to tension.

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.