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RE: intermediate ties for pedestals in pre-engineered metal building

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Bill:

They added extra ties around anchor rods when asked.  They are arguing about
having no vertical bar farther than 6" from a tied bar and having every other
vertical bar tied. There is a bunch of steel required to meet 1% minimum area
for this pedestal.  The only tied bars are corner bars.  For the pedestal
dimensions all the bars need to be tied to meet the requirement.

Scott.

-----Original Message-----
From: Scott, William N. [mailto:William.Scott(--nospam--at)veco.com] 
Sent: Thursday, May 12, 2005 1:43 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: intermediate ties for pedestals in pre-engineered metal building

Scott,

I assume that the building is in a high seismic area (Anchorage, AK). If so,
ties are required to keep the anchor bolts within a confined  concrete core.
See provisions for seismic detailing in ACI 318.

Bill

-----Original Message-----
From: Haan, Scott M POA [mailto:Scott.M.Haan(--nospam--at)poa02.usace.army.mil]
Sent: Thursday, May 12, 2005 8:18 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: intermediate ties for pedestals in pre-engineered metal
building


Harold:

The vertical reinforcement is not required for strength.  Extra vertical
reinforcement is added to meet minimum vertical reinforcement ratios.  My
question ends up being if extra bars are added to meet a minimum
reinforcement ratio do they need intermediate ties by the code even if the
vertical reinforcement is not required for strength?

Respectfully,
Scott Haan

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com] 
Sent: Thursday, May 12, 2005 6:50 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: intermediate ties for pedestals in pre-engineered metal
building

Scott,
If the pedistal requires reinforcing, then the answer is yes.  You must 
apply all of the provisions of ACI 318.  If it does not require reinforcing,

then a few bars will make no difference.

Regards,
Harold Sprague




>From: "Haan, Scott M POA" <Scott.M.Haan(--nospam--at)poa02.usace.army.mil>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: <seaint(--nospam--at)seaint.org>
>Subject: intermediate ties for pedestals in pre-engineered metal building
>Date: Wed, 11 May 2005 17:05:32 -0800
>
>Do pedestals / pilasters in pre-engineered metal buildings have to meet ACI
>318 7.10.5.3 compression member tie requirements?  Does a 30"x30" square
>pilaster with 12 vertical bars have to have ties spaced not more than 6" 
>and
>every other bar tied?  I've done a review on a design build contract and no
>intermediate ties were provided.  The designer is arguing that the pilaster
>is lightly loaded and ties were only provided based on good engineering
>practice.  Your answer may help spend your income tax dollars more wisely.
>
>
>
>Thanks for your opinion.
>

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