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Commentator

Join Date: Sep 2009
Posts: 59

Seismic Anchor Studs

09/18/2009 9:57 PM

Today my client rejected the Hilti anchor stues we submitted in our seismic analysis for our control panels. Is there another manufacturer that is commonly used? They client did not state why the rejected the Hilti anchor studs.

Can anyone shed some light on an approved equal seismic anchor stud?

Monday I'll ask the general contractor what stud they used for the MCC, Switchgear, and VFD panels, but it will be forever to get a response from them.

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Power-User

Join Date: Apr 2007
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#1

Re: Seismic Anchor Studs

09/19/2009 11:13 PM

the client should tell you why they reject the anchors.

it may be due to the following:

- anchors have not been tested by an accredited agency in the country you are proposing them

- they are insufficient for the weight and seismic conditions

- they are incompatible with the material to which you are anchoring them e.g. anchors don't work in thin slab sections

without the clients comments, you are not really in a position to propose another type of anchor.

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Commentator

Join Date: Aug 2006
Posts: 89
Good Answers: 3
#2

Re: Seismic Anchor Studs

09/19/2009 11:17 PM

Rabat,

Most likely chemical (epoxy) will fill the bill.

Your best (fastest) bet would be to contact a local masonry supply house (White Cap, Grainger or Fastenal a few that come to mind) and ask them what is suitable in the region your panels are located.

Of course, you could spend hours of research, but most likely, a knowledgeable counterman or sales rep could make your life easier.

a couple of suppliers that conform to those tough California specs:

if you contact these companies, they can help

http://www.simpsonanchors.com/

http://www.us.hilti.com/holus/modules/prcat/prca_navigation.jsp?OID=-12136

http://www.itw-redhead.com/

good luck

JB

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Guru

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Location: Transcendia
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#3

Re: Seismic Anchor Studs

09/19/2009 11:18 PM

Far as I know you are talking about Tapcons, and Hilti's are as good as Tapcon.

I could be wrong, since you say anchor studs, and Tapcons are really screws for going into concrete. They are normally put in with hammerdrills.

Nut heads are better than screw heads.

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Guru

Join Date: Dec 2006
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#4

Re: Seismic Anchor Studs

09/20/2009 3:03 AM

Ask HILTI,

they will help to get the missing information.

RHABE

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#5

Re: Seismic Anchor Studs

09/20/2009 10:15 AM

Hello All,

First question I'd ask is: "Did the submitted shop drawings for the Hilti Anchors fully conform to the Contract Documents.....chiefly the Specifications?"

If not, then that's reason for the "Rejection". If need be ( and if permitted by the General Contractor) you may have to check with the Engineer of Record for his/her interpetation of the specification that they were responsible for generating for inclusion into the Project Manual. Also, double check any anchor call-outs on the Contract Drawings as sometimes (but not always) supercede the miniumum requirements set forth in the Specifications. Watch out as this situation can be reversed in some instances!!! Usually, if there isa conflict then the superior material usually governs pursuant to the contract language in the Boiler Plate. Okay, usually relationships between the GC and you, the SubContractor may not permit you to contact the Engineer or the Architect....you may be required to follow the "Chain of Command" and contact the GC only. Check your Contract and the Contract Documents!

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Anonymous Poster
#6

Re: Seismic Anchor Studs

09/20/2009 10:37 AM

Probably they were not rated for cracked concrete, which call for Hilti TZ anchors --seismic rated-- Simpson makes seismic rated anchors also if you are in US .

Best of luck

Soy Cowboy

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Power-User

Join Date: Apr 2007
Location: New york
Posts: 139
Good Answers: 6
#7

Re: Seismic Anchor Studs

09/21/2009 1:18 PM

Do the hilti anchors (which I use all the time among others) interfere with seismic monitoring ? There are many kinds of anchors and I would need more specifics but I can't help but wonder if certain anchors interfere with seismic monitoring because they do not isolate seismic activity from analyzation equipment ?

Do you need to isolate the anchors from the cement, etc., which could mean you need to have a certain type of sleeve for the anchor ? (plastic or neoprine ?) Certain lag style anchors have such sleeves.

What exactly are you fastening, and what to ?

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Associate

Join Date: Aug 2009
Location: Bklyn,NY; FtL, Fl; Jumet, Belguim
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#8
In reply to #1

Re: Seismic Anchor Studs

09/21/2009 9:14 PM

Perfect answer

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Anonymous Poster
#9

Re: Seismic Anchor Studs

09/22/2009 10:51 AM

In my state, you cannot use anchors that use wedges for seismic or for anchoring any motor 10 hp or greater. This pretty much leaves epoxy. Check the Powers website.

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Anonymous Poster
#10

Re: Seismic Anchor Studs

11/05/2009 5:17 AM

Hello

Be very careful with the Powers resin and that longterm creep isn't and issue. The Boston Big Dig they used Powers epoxy resin overhead which wasn't suitable because it suffered from longterm creep and as a result a roof slab of the tunnel fell off and crushed a car killing the occupants.

Hilti do a new epoxy product called RE500-SD. The SD stands for Seismic Design to the latest codes and has the right approvals.

Good luck with your application

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Participant

Join Date: Feb 2011
Posts: 1
#11

Re: Seismic Anchor Studs

02/11/2011 4:47 PM

Seisco makes a seismic certified 12mm anchor. www.seiscoanchors.com

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