Tubular Steel roof truss

Various types of Roof trusses for various spans

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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.
  • External forces and reactions to those forces are considered to act only at the nodes and result in forces in the members which are either tensile or compressive forces.
  • Moments (torsional forces) are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes.

In this article, we are going to discuss the various types of roof trusses in wood and steel and their uses in various kinds of construction.

Different types of Wooden and Steel Roof Trusses:

  1. King Post Truss
  2. Queen Post Truss
  3. Howe Truss
  4. Pratt Truss
  5. Fan Truss
  6. North Light Roof Truss
  7. Quadrangular Roof Truss

Trusses for large span constructions

King Post Truss

King Post roof truss (spans upto8M)
King Post roof truss (spans upto8M)
  • King Post Truss is a wooden truss.
  • It can also be built of combination of wood and steel.
  • It can be used for spans upto 8m.

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Tubular Steel Roof Truss | Trussed large span Constructions

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Tubular Steel roof trusses are used for large span constructions such as factories, industry worksheds, shopping malls, huge exhibition centres, multiplexes etc. They are generally used for spans as large as 25-30m.

There is a similar kind of a truss called “Tubular Steel Monitor Roof Truss“. There are projections on the roofs called “Monitors” to admit daylight into the space.

Tubular Steel Roof Truss
Tubular Steel Roof Truss

  • It is in two halves with bolted joints at P and Q, the remaining joints being 5mm fillet welds made in the workshop.
  • The main tie member rises 130mm from L to N to counteract any appearance of sag that would be evident if it were horizontal.
  • A bend a N reduces the midspan height to 2m so that the half truss is a manageable size for transportation.

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