Greentram Software Support Forums  

Go Back   Greentram Software Support Forums > Structural Design - not software related > Steel design

Steel design Topics related to the design of structural steelwork to BS449 or BS5950

Closed Thread
 
Thread Tools Display Modes
Old 18th August 2011, 03:07 AM   #1
Tony Bryer
Administrator
 
Join Date: Apr 2008
Location: Melbourne, Australia
Posts: 780
Default Do you really want to specify a RSJ? Probably not.

A query from a UK user says "Just had a call from a builder trying to order 203x102x25kg/m RSJs, which I calculated were required to support cavity wall structure over. However steel suppliers say that 25kg RSJ not available only 23kg."

The confusion has probably arisen because we so often refer to I-sections as RSJs (rolled steel joists) when this is not technically correct (as in the supplier's response). RSJs are I-sections rolled with a tapered flange, whilst currently rolled I-sections whose flange inner and outer faces are parallel are properly described as universal beams (UB, alternatively UKB the Corus trademark). The UB replacements for the smaller RSJ sections were first introduced around 1980 although RSJ sections remained in use for many years after.

We include RSJ sections in the SuperBeam and ProSteel steel data files so that you can check these when necessarily, most usually because you are changing the load on an existing beam or your client wants to use a secondhand section. In other cases specify a UB (or perhaps UC) section. The only exception to this is if for some very good reason you want to use one of the two RSJ sections that are still currently listed, viz 102x44x7.44 and 152x127x37.30 (source http://www.parkersteel.co.uk/).
__________________
Tony Bryer, Greentram Software Pty Ltd
Tony Bryer is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT. The time now is 04:31 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2011 Greentram Software Pty Ltd, Melbourne, Australia