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RE: no. of anchor bolts

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The columns must be anchored as they are erected. Bracing them would require some effort while the column is un-anchored. Bracing may also be required for stability.
The National Institute of Steel Detailers ( and Steel Erectors association of America ( have published a good resource for detailing to 29CFR1926. "Detailing Guide for the Enhancement of Erection Safety".

From: Bill Allen [mailto:t.w.allen(--nospam--at)]
Sent: Wednesday, September 26, 2007 9:30 AM
To: seaint(--nospam--at)
Subject: RE: no. of anchor bolts

Scott –


I’ve often wondered about this.


What if the column is braced during construction? Does this satisfy the requirement?


T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509

-----Original Message-----
From: Scott, William N [mailto:William.N.Scott(--nospam--at)]
Sent: Wednesday, September 26, 2007 10:06 AM
Subject: RE: no. of anchor bolts


2 bolts does not conform to 29CFR1926.755. You could assemble the stair tower and lift it into place as an alternate to save 8 inexpensive anchor bolts to rent an expensive crane.




From: Micayas, Julius [mailto:jmicayas(--nospam--at)]
Sent: Wednesday, September 26, 2007 8:51 AM
To: seaint(--nospam--at)
Subject: no. of anchor bolts

Due to some clearance problem we are inclined to provide two anchor bolts instead of four for our stair tower base plate. The load or the capacity is not an issue, two-bolt is adequate. My only concerned was back in 1999 when I did a retrofit project they told me that 2-anchor bolts is no longer acceptable (i.e. for construction safety…)


I’d like to know what part or chapter this be that deprive me to do so.




Engr. Julius Micayas

P.E. license no.32969

Senior Lead Structural Engineer

Phone - 504-841-3014 (direct)

504 837-5275 (office)

Fax - 504-837-2986