What Is A Scissor Truss? What Is A Scissors Truss Used For?
What Is A Scissor Truss?
A scissor truss is a specific type of roof truss which is designed in a way that the top members of the truss intersect the bottom members at an angle, forming a strong, rigid, and stable triangular shape.
This triangular shape is beneficial for adding strength to the roof structure and allows for larger spans between support posts. Scissor trusses are widely used in roof structures for commercial and residential buildings due to their strength and flexibility.
Scissor trusses are among the most commonly used trusses in the world, particularly for buildings with spans of about 10 meters (33 ft) or more. They are also used in bridges and other structures.
In a scissor truss, two simple triangles form an inverted “V” shape that supports loads through diagonal tension members at their bases and compressive forces at their tops.
In addition to being light weight, this configuration allows for easy fabrication using standard materials such as steel plate girders or rolled I-beams.
What Is A Scissors Truss Used For?
A scissors truss is a type of truss that is used to support a pitched roof with a sloped or raised ceiling surface. A scissors truss has two triangles connected at the top by a horizontal beam, forming an inverted “V” shape.
The triangles are placed on either side of the vertical column, which makes them look like they’re opening up like a pair of scissors.
Scissor trusses are generally used in building construction to support roofs with large spans and/or heavy loads, such as those found in warehouses and factories. They’re also sometimes referred to as “short-span” trusses since they can span shorter distances than traditional wood trusses (around 40 feet).
What Are The Three Types Of Trusses?
There are three main types of trusses: simple, planar, and space frame. The type of truss chosen will largely depend on the needs of the structure it supports and how much weight it must hold.
- Simple
Simple trusses are the most common type of truss, and they’re also the easiest to design and build. The least expensive to construct, simple trusses are also the most efficient in terms of strength vs. weight ratio.
They’re also the most stable because they don’t rely on any one member being stronger than another; instead all members work together to support loads on both sides of each joint at once (known as “skew”).
- Planar
Planar trusses are made up of straight members that are connected at joints. Planar trusses are not as strong as simple or space frame trusses, but they are used in buildings that do not need to be very strong. The following image shows a planar truss:
- Space Frame
Space frame trusses are the most complex type of truss, and they’re used in buildings that need to be very strong and resistant to earthquakes. Space frame trusses can also be used in buildings that need to be very tall.
Are Scissor Trusses Strong?
Scissor trusses are pretty rigid, but they tend to sag much more in the middle when compared to gable trusses. Because of this, scissor trusses are not as strong as gable or king post trusses. They’re not even as strong as queen post-trusses.
The scissor trusses can be made stronger by putting a reinforcing bar in the king post connection, but this is expensive, and I don’t think it’s necessary. The scissor truss is pretty rigid, so adding more strength isn’t make that much of a difference.
The main point here is that you shouldn’t worry about your scissor trusses sagging too much or being too weak because they are designed to handle a lot of weight without bending or breaking apart like other forms of construction do when overloaded with stress on them (like roofs).
