It does, however, offer similar advantages and disadvantages to the Pratt Truss, and while it is not often used, it is a sturdy design. The key difference is that the vertical members have been reduced, which improves its buckling resistance.
The K Truss is a more complex variation of the Pratt Truss. Both vertical members and horizontal members are compressed. These are similar to the design of scissors trusses however they are not constructed with rafters.Ī scissor truss is a variation of the standard form with each member offset at its mid-point. Scissor Truss (also known as Vaulted Truss)Ī truss roof is made up of two triangular or compound triangles which meet each other at a point. This style of truss is best suited for horizontal spans when the force is mostly vertical. This has a few effects: it reduces the cost of the structure owing to more efficient members, it reduces self-weight, and it makes the structure easier to build. The vertical members are compressed, whereas the diagonal members are tensed.īecause the steel in the diagonal members (in tension) can be reduced, the design is simplified and more efficient. Pratt TrussĪ Pratt Truss has been used as a useful truss technique for over two centuries. In the case of a barn, because the members are typically made of wood, the structure functions more like a frame than a truss. Gambrel TrussĪ gambrel truss features two different slopes on the outside, with the slope getting steeper from the center.īecause of their outward protrusion, gambrel trusses can be effectively equipped with a hollow center that can be used as a storage room.Īs a result, the upper section of a barn is typically constructed in a gambrel shape. King Post TrussĪ king post truss is a variation on the queen post and is used in roughly the same way. The V pattern grows considerably thinner when the top chords slant downward from the center.įink trusses can be particularly efficient at transmitting loads to the support because they rely more on diagonal members. In its simplest form and contains web members that follow a V-pattern that can be repeated numerous times. It is a very simple but efficient shape and can be used in all manner of projects. Fink TrussĪ fink truss is a very common roof truss type with a ‘W’ shape between the chords. These are no longer commonly use because the Fink truss has taken their place. Queen Post TrussĪ queen post truss is a vertical upright with two triangles on either side.
They are often used for rooftop structures or for pedestrian bridges. The triangular shape helps reduce the effects of swaying due to wind or traffic. The purpose of a scissor truss is to provide the upper triangle with lateral stability. The triangular units are positioned with one point in the ground, and the other two points from the top of the triangle with a horizontal connection.
#2X10 SPLICE PLATE FOR TRUSSES SERIES#
Functions of Scissor TrussesĪ scissor truss is a structural system consisting of a series of triangular units in the shape of a scissor, with the connecting members either parallel, or perpendicular, to each other. When this happens, the trusses can be forced out far enough that the outer chords become damaged. These are prone to sagging under load, which then pulls the inner trusses outwards. The main problem with this particular design is with the common purlins, which are suspended from the upper chords at their midpoint. It is also very commonly seen on residential buildings. The scissors truss is one of the most common roof truss types in use today, used in a wide range of buildings from those built for agricultural purposes to those used for industrial purposes. It may also be used as a horizontal roof truss. The use of scissors trusses is appropriate for spanning between two support points (columns, walls). Scissor trusses are used under sloping roofs.
Suitable Uses & Applications of Scissor Truss Scissor trusses are quick and easy to construct, which is why they are sometimes the building components chosen for constructing the roof. They are not always the most efficient way of building a truss roof, but they are quick and easy to construct. Special attention is needed to determine the appropriate size, or “spans,” for the supporting beams.Ī scissor truss is a building component primarily used in the construction of the truss roof. Scissor trusses are used to support the weight of the roof of a building, and are usually located along the roof’s edge. Scissor trusses are almost exclusively employed in building construction to support a pitched roof with a sloping or elevated ceiling surface.Ī scissor truss is, in simplest terms, an A-frame structure made of two triangular shapes, or “legs,” joined at the top with a beam, or “pitch.”
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