fan truss noun Save Word Definition of fan truss : a truss (as of a roof) characterized by the radiating lines of the king post
King post
A king post (or king-post or kingpost) is a central vertical post used in architectural or bridge designs, working in tension to support a beam below from a truss apex above (whereas a crown post visually similar, supports items above from the beam below).
What is a fan truss roof?
Fan trusses are form of Fink roof truss. In Fan Trusses, top chords are divided into small lengths in order to provide supports for purlins which would not come at joints in Fink trusses. It can be used for spans from 10-15m.
What is a truss?
What is a Truss? In Architecture and Structural Engineering, a truss is a structure comprising one or more triangular units constructed with straight slender members whose ends are connected at joints referred to as nodes.
What is the difference between Fink and fan trusses?
In Fan Trusses, top chords are divided into small lengths in order to provide supports for purlins which would not come at joints in Fink trusses. It can be used for spans from 10-15m.
What is a double Howe fan truss?
Double Howe It’s the Howe truss web configuration with an extra pair of vertical post and diagonal on both sides. 9. Modified Fan It’s the Double Fan truss with a central vertical post and an extra pair of the upright and diagonal.
What is a fan truss made of?
Fan Truss. Just like you can see from many roof truss types pictures, the Fan Truss comes with a very simple design and it’s made out of steel. In this particular situation, the trusses form a fink roof truss. On top of that, the main characteristic here is that the top chords are split into smaller lengths, as this allows ...
What is a truss roof?
A roof truss is basically a structure that includes one or multiple triangular units that include straight slender members with their ends connected via nodes.
Why do roof trusses have more resistance?
This happens because it’s cheaper to add a truss that has a wide, larger set of lattice girders that include support trusses. This method is one of the oldest, as well as most economical ones that you can find on the market, as it allows you to bring in proper ventilation. Plus, the roof has more resistance too because of that.
What does revolute mean on a roof truss?
Also, the joints in a truss are seen as revolute, which means that the torsional forces are excluded. But since there are different types of roof trusses, let’s find out which ones are the most popular and what distinct features they have.
What is a Pratt truss?
Pratt Truss. This is one of the most popular steel roof truss types and it is quite economical . 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.
What is a king post truss made of?
King Post Truss. This particular truss is made out of wood most of the time, but it can also be built out of a combination of steel and wood. It all comes down to the architect and the building structure. The King Post Truss spans up to 8m, which makes it perfect for multiple types of houses, especially the smaller ones.
How long is a Queen Post Truss?
The Queen Post Truss is designed to be a very reliable, simple and versatile type of roof truss that you can use at any given time. It offers a good span, around 10m, and it has a simple design which makes it perfect for a wide range of establishments.
What is a fan truss made of?
Fan Truss. Also primarily made from steel, fan trusses have a relatively simple construction but still offer exceptional stability due to having many advanced elements. The top of chords of a fan truss are divided into smaller lengths, creating enhance purlin support.
What is a roof truss?
Not to mention, they can be installed in one piece, often off-site, and installed fully complete. Put simply, a roof truss is what creates the frame of the roof. In addition to supporting the overall structure of the roof, they also determine the shape of the roof and ceiling below.
What is a king post roof truss?
King post roof trusses are the most common variety and also the simplest, as it uses the fewest components of a truss – two top chords, one bottom chord, two webbing chords, and one central vertical post referred to as the king post.
What is a gambrel truss?
A gambrel truss is intended to support a wide-spanning roof and can add vertical space to a structure due to its’ unique, tall design.
What is a Howe roof truss made of?
Howe roof trusses are traditionally made from a combination of wood and steel. The primary structure includes wood, but the tension members and vertical members of Howe trusses are made out of steel. This helps to enhance the durability and reliability, allowing the truss to span up to 30 yards.
Why are roof trusses so popular?
However, the biggest reason that trusses are so popular is because they are roughly 30% cheaper than rafters. Since they are constructed out of lighter materials they are both produced and purchased in large quantities, which, in turn, lowers the price.
What is a queen post truss?
Like king post trusses, queen-post trusses have a relatively simple, yet durable design. However, instead of having on king post at the center, this type of truss features two queen posts connected by a straining beam. The additional posts in this design result in queen-post trusses costing a bit more money to construct.
What is mono truss?
Mono trusses are a single-pitched truss with a vertical member over the opposite bearing of the pitched bearing. These are popular in many agricultural and commercial buildings and can be used as two halves of a truss system with a center bearing as an alternative to a single, long common truss.
What are the two types of trusses?
Two Basic Types of Trusses: The pitched or common truss is characterized by its triangular shape. It is most often used for roof construction. Some common trusses are named according to their web configuration, such as the King Post, Fan, Fink or Howe truss. The chord size and web configuration are determined by span, load and spacing.
What is a half hip truss?
Half hip trusses are utilized in a hip system that only has a pitch applied on one side. This can occur when a hip truss is supported by a girder truss on one end. Hip. Hip truss systems are very popular throughout the country. In this design each side of the building has a roof pitch and eave.
What is a parallel chord truss?
The parallel chord or flat truss gets its name from having parallel top and bottom chords. This type is often used for floor construction, but can also be used in roof applications.
What is a bowstring truss?
Bowstring trusses can be manufactured today to match existing structures or to match the look of an older, industrial-style building. Cantilevered Mansard with Parapets. This style truss, or a derivative of it, is very popular in light frame commercial construction.
What is dual pitch truss?
Dual pitch trusses, just as the name suggests, have two different pitches on each side of the truss. This truss can be used when the builder designer desires a steep pitch facing one direction of the building and a narrower pitch on the opposite side.
Where is the butt cut on a cap truss?
To aid in manufacturing and installation a ¼” butt cut is typically added to the end of the cap truss at the end of the horizontal cut of the sloped top chord. Polynesian. Polynesian trusses, as the name suggests, are most commonly found in structures built in an Asia-Pacific Polynesian style.
What is a truss?
A truss is a web-like roof design of wood or steel that uses tension and compression to create strong, light components that can span a long distance. The sides are in compression and the bottom is in tension to resist being pulled apart. Engineers design trusses to withstand the three types of loads associated with a building:
What is compression force?
Compression force is a key concept to understand when working on any construction project, no matter its size. Compression is the force that pushes elements together, while tension pulls them apart. The design of trusses and other parts of house framing distribute the loads toward the ground.
Elements of a truss
A roof truss is formed using three components: top chords, a bottom chord, and bracing. There are a number of different designs that can be used for a truss. In most cases, there are two top chords and one bottom chord, which join together in a triangular shape.
6 types of trusses
A truss can be configured in a number of different ways. Here is a brief overview of some of the most popular types of truss designs.
What is a pitch truss?
A pitch truss with two sets of different sloping sides. They’re often placed at the front and back of each other with the front pitch usually steeper. This is used for gable roofs.
What is a mono truss roof?
A mono truss roof allows for more sunlight and visual space, proper drainage and relatively cheaper. It’s often used for sheds, garages or extension of an existing roof. 2. Mono Scissors. It’s a variation of the Scissors Truss and used in residential as well as commercial and industrial buildings.
Why do hip roofs have a truncated apex?
A pitch truss with a truncated or flat apex so that it can support more load. Hip roofs are more stable than gable roofs and more resistant to strong winds and hurricane.
