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RE: Beam restraint

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In Australia the limits on deflection are only a guide ie. not mandatory.

The steel code suggests a limit of L/250 for the serviceability load case
defined in the loading code (half this for cantilevers).  For industrial
structures, our serviceability load case would be (DL + 0.7 LL).

Having said that, we have often used L/360 as an industry "standard" because
of the "abuse" that these structures are given by their users and their need
for a robust structure (so much for elegant design!).

Normally, the LL would be 5 kPa (sorry about the metric term folks!).  If
required by a specification to apply the L/360 limit, I would normally do
this with 3 kPa live load.  Without such a spec, I would use the L/250


Dave Meney (SE)

> -----Original Message-----
> From: Brian K. Smith [mailto:smitheng(--nospam--at)]
> Sent: Friday, 4 September 1998 2:47 am
> To: seaint(--nospam--at)
> Subject: Beam restraint
> While we are on the subject of steel floor supports:
> I am working on a similar project, a multi-leveled equipment mezzanine
> with checkered plate flooring.
> What is the general consensus regarding allowable deflection of the
> framing.  I am using L/120 for Dead plus Live.  It appears as though
> both the UBC and SBC deflection criteria in Chapter 16 are oriented
> toward roof deflections with ceilings.
> Brian K. Smith, P.E.