Various types of Roof trusses for various spans

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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Metal Lath Partitions | Metal Partitions

Expanded-Metal Partition or Metal Lath Partition

Metal lath and plaster have been used in both residential and commercial applications to partition interior space and in non-load-bearing exterior walls where appearance and durability are key.

Various Metal Laths
Various Metal Laths

Rib lath

  • Rib lath is widely used as a plaster backing on ceilings,walls and stud partitions.
  • Rib Lath is also ideal for refurbishing damaged or aged masonry walls
  • Material: Galvanized Steel for dry conditions.
  • Stainless Steel for external use and condition of heavy condensation or persistent damp.

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Column Bases | Design of Steel Structures

Column bases are structural elements used in the design of steel structures to transfer the column load to the footings.

Types of Column bases

  1. Slab base
  2. Gusseted base

Slab Base

Slab Base

Slab bases are used where the columns have independent concrete pedestals. A thick steel base plate and two cleat angles connecting the flanges of the column to the base plate. In addition to these, web cleats are provided to connect the web of the column to the base plate. These web cleats guard against the possible dislocation of the column during erection. The ends of the column and also the base plate should be mechanized so that the column load is wholly transferred to the base plate.

Area of base plate= (load of column)/(permissible bearing stress in concrete)

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Hollow Cement Block Partitions

What are Hollow Cement Blocks?

Hollow and dense cement concrete blocks known as hollow blocks, have been developed as an alternative to bricks. The products are widely used in construction activity. They are lighter than bricks, easier to place and also confer economics in foundation cost and consumption of the cement. The hollow blocks are made of cement, stone chips, stone dust and sand are not onlycheaper than bricks but have other specialities as well. These blocks have more tensile strength, the walls constructed from these blocks act as thermal insulaters because of their hollowness.

Hollow Cement Blocks Partition
Hollow Cement Blocks Partition

These blocks find wide applicability and construction cost is largely reduced. It is also observed that there is good demand for housing activity among tribals. As the construction activity is growing day by day, there is a good demand for hollow and cement concrete bricks.

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Tubular Steel Roof Truss | Trussed large span Constructions

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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