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Foundation Design, Baseplate and Hold-down Bolts  

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Alireza Anisi
(@1027572)
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10/02/2021 9:07 am  
 
Re design of hold down bolts, base plate and foundation of the EBF columns, I knew that the foundation will be designed for overstrength factored shear load in active link plus corresponding gravity loads in the column. But what about design of base plate and bolts?, do we need to design them for horizontal and vertical components of the section capacity of the braces plus gravity axial load in the column? Or there are other conditions to consider? Thank you.

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Josiah
(@1014595)
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10/02/2021 9:20 am  

HERA have a really useful EBF design guide that is well worth purchasing. It goes through design procedures for all components of EBF’s, including the required design loads that you are asking about, and it has a couple of worked examples.

https://hera.softlinkhosting.co.nz/liberty/opac/search.do?mode=BASIC&openDetail=true&action=search&queryTerm=uuid%3D%22f38c21fac0a838010096bce10010a7f6%22&operator=OR&_open=1#


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Alireza Anisi
(@1027572)
New Member
Joined: 3 years ago
Posts: 4
10/02/2021 2:24 pm  

@1014595 Thank you Josiah. I am not sure if you mentioned HERA P4001:2013 or other references. I have got a copy of P4001,which do not have a baseplate and hold-down bolt design procedure. However, there is a note in page 45 saying that the forces in the foundation are likely to greater than those calculated for the columns at the base of the structure due to the presence of the braces. It may imply that both actions from column and brace need to be considered but I personally do not think that it should be the case. 

Columns have already design for derived capacity design actions of the upper level active links, so I do not see any point to add the brace actions to this demand. However, I think that the shear key to be designed for the horizontal load component of the brace. 

 

Please let me know your thoughts. Thank you.

 

 


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Josiah
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19/02/2021 4:21 pm  

Hi Alireza, yes I was referring to P4001:2013.

The connection into the foundation is required to resist the capacity design actions from both the column and the ground floor brace. The worked examples in P4001 give some indicative design information for foundation connection loads, have a look on Sheet 33, Section A.7 of the example.

There are other resources around for baseplate design, try this SESOC one: https://www.sesoc.org.nz/library/guidelines/anchor-bolts-for-steel-structures-draft-design-guide/


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