How To Design A Steel Roof Truss

The truss system design should be outlined on a hard copy document.

How to design a steel roof truss.

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. To make this post simpler and shorter a 29 page fully referenced design paper for all the trusses in the roof system has. Cut plywood gusset plates to fasten. The same thing is true for the bridge of the truss.

Ensure the distance is equal between each truss so they all withstand the same amount of pressure. Size the bottom chord 0 25 inches 0 64 cm longer than the floor. Design the steel truss in accordance with the total stress load a standard grade of steel astm 36 can accept a yield stress value of 36 000 pounds per inch. 1 5 kn m 2 variable load 0 75 kn m 2.

The skeletal structure of a roof system 18 0m long and 7 2m wide is as shown in figure below. You need to measure the width of the roof area as well as the height of the roof s peak. These steel joints are needed to support the overall truss. Since 1950 the manufacturing efficiency of steel trusses has improved dramatically driving down costs and increasing versatility.

Designing your truss 1. The span of the roof is what determines the size of the roof truss. The open web design as used in steel roof trusses vertical towers and steel floor trusses demonstrate an incredible variety of design applications fulfilling almost any architectural need in modern building and bridge construction. The steel roof truss is one of structural engineering s most important and iconic elements.

Cross gabled roof go across saddleback roof is a style that contains 2 or even more saddleback roof ridges that converge at an angle many frequently vertical to each other. Made of individual members with equal counteracting tensile and compressive forces its purpose is designed to behave as a single object which carries supports a load over a span. The design data is given below. Consult the manual of steel construction published by the american steel institute of construction for details on the stress load of each type of steel.

The truss is made up of howe truss configuration spaced at 3m intervals. We are required to carry out the member design of the trusses for this 23m span open hall. It is desired to specify the appropriate angle sections that will safely carry the anticipated loading using eurocode design code specified steel grade s 275. Use either readily available blueprint sheets or a computer truss design program.

Step 1 size the roof truss. Incorporate overhanging top chords to add extra visual flair. You can then determine the size of each side of the roof from the peak. Bs en 1993 1 1 2005 design wind pressure.

On some roof trusses the 2 top chords extend down over. Since the steel roof truss is a triangle these measurements are crucial. Steel roof truss design calculator cross gabled roof.