Theory of Built-up Sections




, , , , , ,





  • A built-up beam is also known as compound beam.
  • The built-up beams are used when the span, load and corresponding bending moment are of such magnitudes that rolled steel beam section becomes inadequate to provide required section modulus.
  • Built-up beams are also used when rolled steel beams are inadequate for limited depth.
  • In building construction, the depth of beam is limited by a space provided by the architect.
  • Drawing beam of small depth do not provide required section modulus. Therefore, plates are attached to the beams.
  • The strength of rolled steel beams is increased by adding plates to its flange which is one of the method forming built-in section.
  • The other method is to compound a number of rolled steel sections themselves.

Built-up Section

The built-up sections shown in figure’ A’ and ‘B’ are used for heavy loads and small spans.

Built-up Section

The built-up section ‘C’ is also used for heavy loads and small span.

Built-up Section

The built-up section ‘D’ is used for light loads and large spans.

Built-up section

The built-up sections ‘E’ & ‘F’ are provided for Gantry girders.

Related posts:

  1. Tubular Steel Roof Truss | Trussed large span Constructions
    1. #1 by ig1230 on December 27, 2009 - 1:17 am

      I want to quote your post in my blog. It can?
      And you et an account on Twitter?

    2. #2 by BenzuJK on December 29, 2009 - 7:21 pm

      ig1230 :

      I want to quote your post in my blog. It can?
      And you et an account on Twitter?

      Go ahead and quote this post in your blog. But please leave a link back to the source.

      You can find me on Twitter @architectpupil

      Cheers!

    3. #3 by Islam Australia on February 23, 2010 - 3:54 am

      Wonderful Blog, Well explained and very informative. Thanks

    (will not be published)