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Re: Steel Column Base Plates

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Rick.Drake(--nospam--at)fluordaniel.com wrote:
> 
>      During the erection of steel columns, the contractor needs some means
>      of leveling the base plates and plumbing the columns.  Two common
>      choices are 1) steel plates or shims between the foundation and base
>      plate and 2) leveling nuts beneath the base plate.  In both cases
>      grout is placed between the foundation and base plate after the
>      columns are plumbed.  I am interested in current practices for
>      commercial buildings.
> 
>      What are the advantages and disadvantages of each leveling/plumbing
>      method in high seismic zones?
> 
>      Do you normally specify a method or leave it up to the preference of
>      the contractor?
> 
>      Do you normally specify "drypack" grout or nonshrink grout, or do you
>      leave it up to the preference of the contractor?
> 
>      Thanks,
> 
>      Rick Drake, SE
>      Fluor Daniel, Irvine
> 
> 
> 
RICK:
WE DETAIL ONLY DOUBLE NUTS FOR LEVELING - NO SHIMS.  SHIMMING IMPEDS THE
INSTALLATION OF GROUTING.

WE ALSO SPECIFY THE GROUTING AS EMBECO, ETC...

THIS ALL SHOULD OCCUR PRIOR TO PLACING THE CONCRETE DIAMOND AT THE
COLUMN BASE.

REGARDS  

DONN WOOLDRIDGE RA & SE