Temporary Truss Bracing

• Mar 15, 2022

• #2

XR250

Structural

Jan 30, 2013

5,595

Have not seen that. I cant imagine anyone wanting to pay me to provide those details with the associated liability.

 

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• Mar 15, 2022

• #3

jayrod12

Structural

Mar 8, 2011

6,194

The truss plate Institute has a technical guide about this. I'm fairly certain temporary bracing is the installing contractors problem, not the EOR.

 

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• Mar 16, 2022

• Thread starter
• #4

dianium500

Structural

Dec 3, 2008

46

I rejected the note as I believe that this is not the EOR's responsibility.

 

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• Mar 16, 2022

• #5

kipfoot

Structural

Oct 25, 2007

492

they may need an engineer for long spans. from ANSI/TPI 1 -2014

 

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• Mar 16, 2022

• #6

jayrod12

Structural

Mar 8, 2011

6,194

Oh I agree that permanent bracing is the EOR's responsibility, the temporary bracing is not.

However, as per kipfoots quoted clause, if the truss are longer span, that temporary bracing also needs to be designed by an engineer. But to me that should be an engineer acquired by the contractor.

 

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• Mar 16, 2022

• #7

dauwerda

Structural

Sep 2, 2015

1,043

Similar verbiage to what kipfoot posted has made its way directly into the IBC (2021) now as well.

https://codes.iccsafe.org/content/IBC2021P2/chapter-23-wood#IBC2021P2_Ch23_Sec2303.4

 

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• Mar 16, 2022

• #8

OldDawgNewTricks

Structural

Jul 22, 2021

161

The requirement has been in the IBC since 2009. But note that it says the Owner shall contract with any Registered Design Professional to design the bracing. In my experience, bracing is typically designed by the truss engineer and then the bracing loads that are imposed on the primary structure are reviewed by the EOR. But that is not the only possible method of satisfying the requirement though, as long as some registered design professional is contracted to provide the bracing design.

 

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• Mar 17, 2022

• #9

GeorgeTheCivilEngineer

Structural

Apr 25, 2017

283

In the UK it's temporary works so would normally sit with the Contractor/Principal Contractor. The Building Engineer may need to give input but only so far as any other temporary works scheme would require.

 

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• Mar 17, 2022

• #10

EdStainless

Materials

May 20, 2004

16,118

Back in the '70s I worked as a draftsman for a structural that did a lot of truss design work.
I don't recall his exact criteria, but for long and unstable (mostly scissor) trusses he designed both temp and perm bracing.
Over the few years that I worked there there were two erecting accidents.
In both cases they had ignored the temp bracing requirements.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

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• Mar 18, 2022

• #11

HouseBoy

Structural

Nov 21, 2005

464

Is there a "design procedure" or otherwise a set of guidelines for the design of each of these (temp and permanent truss bracing)?
This is an often bantered about topic but I'm wondering how easy or difficult it really is.
I hear some people say they "never" design t and others say they "always' do.
Is there a prescriptive standard or other type of guideline for this.

I'll look at the link that dauwerda provided....

 

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• Mar 18, 2022

• #12

KootK

Structural

Oct 16, 2001

18,302

For temporary bracing, the trade associations do offer some guidance. Here's one example: Link.

For permanent bracing, when it's addressed at all, the EOR often specifies how runs of nodal bracing are to be terminated such that the bracing itself is laterally restrained. Usually that's intermittent cross bracing but it can also be tie-ins to masonry walls etc.

 

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