Hilti Catalog Design Values

[NS4U]

Does any one know if there is material out there which goes over how Hilti came up with various edge distance and spacing factors?

I want to try and understand how Hilti is coming up with its design values using ACI.

I am particularly interested in an explanation of the design tables, correction factors and design example for the Kwik Bolt 3.

Thanks

 

[NS4U]

I'll throw this out there too...

They do an example at the of the KB3 section showing the capacity of a bolt group using ACI 318... if you're willing, can someone explain how would I come up with the same design value as shown (5,034 lb), by just using the design tables & corrections...

The design example is on pg 352 of the 2008 product guide

 

[JedClampett]

Hilti has a professional and helpful engineering staff. I'm sure they would be happy to run through the calculation for you. Contact them at:

http://www.us.hilti.com/holus/modules/editorial/edit_singlepage.jsp?edtid=-21198_000001

The ACI 318 calculations are involved and complicated. Plus with adhesive anchors there are factors that Hilti applies that are not in ACI. It's best to go direct to them or attend one of their workshops.

 

[IFRs]

I strongly suspect that Hilti tested their devices in addition to, in place of and/or to confirm the calculations.

 

[Grahammachin]

From my discussions with Hilti in the past re. their masonry fixings. They test their products and apply a factor of safety to their results, then publish these figures for us to use.

I should imagine this is the case with the edge distances as well.

 

[WillisV]

NS4U - read the disclaimer for LRFD design on p330 of the 2008 product guide "Note that the allowable load tables are not developed using the same safety factors as the allowable load Table 6 to 15 provided in the allowable load Section 4.3.5.3 of the 2008 Product Technical Guide and should not be interchanges."

The example you site using ACI Appendix D - the only information in the guide applicable to it are Tables 2,3,and 4 and applicable reduction factors and methodology come straight form Appendix D.

Tables 6 through 15 are a holdover from the allowable strength methodology which are all based on ultimate testing values reduced by a factor of safey of 4.0. This was the way things used to be done prior to the Appendix D saga. You will not get the same results from the different methods, and the allowable strength method is really not permitted by code except in masonry and perhaps some other non critical conditions.

 

[mudflaps]

I agree with JedClampett, call Hilti and get a rep to come to your office. An additional issue - The KB3's are superseded by "TZ" bolts. At least get Hilti to send a new catalog.

Old CA SE