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ICC ES Memo Information From Simpson Strongtie[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: ICC ES Memo Information From Simpson Strongtie
- From: "Wendy Allen" <wallen(--nospam--at)strongtie.com>
- Date: Tue, 13 Mar 2007 16:23:06 -0700
Title: ICC ES Memo Information From Simpson Strongtie
In response to the preceding emails regarding ICC's modifications of ICC-ES reports effective January 1, 2007 I would like to chime in with Simpson Strong-Tie's position on this matter:
Here's the issue: on September 5, 2006, ICC issued a document which stated that ICC would limit the use of adhesives and concrete screws, in concrete only, to Seismic Zones 1&2A (IBC seismic performance categories A&B) after January 1, 2007. The main rationale for this change is that new Acceptance Criteria for adhesives and concrete screws were adopted in June of 2006. These acceptance Criteria were adopted following the design implications of ACI 318 Appendix D. For those who are unaware, ACI 318 Appendix D requires that all expansion anchors and cast-in-place anchors under high seismic loads be designed using Strength Design methodology instead of Allowable Stress Design methods that you are likely used to designing with. In addition, the ACI 318 testing criteria for expansion anchors (ACI 355.2 and AC 193) require that expansion anchors be tested in 'Cracked Concrete'. The new testing criteria (AC) requirements necessitated that the standard Wedge-Type anchors used for structural loads be redesigned. The Simpson anchor now compliant with ACI 318 Appendix D testing requirements (detailed in ACI 355.2) is the Simpson Strongbolt. The ICC code report for the Strongbolt will be available online by late March. The above position from ICC was also due to the fact that "As of January 1, 2007 ICC-ES will be using the IBC 2006". Since ICC is a national organization they have made a stance that is more applicable to areas of the country using the IBC.
For help with your designs see the Simpson Strong-Tie Strength Design software now available online at www.simpsonanchors.com. The software is capable of design for both expansion anchors and cast-in-place bolts.
Now, back to adhesives and concrete screws....Although ICC gave the anchor industry 3 years to transition to the new testing requirements for expansion anchors (i.e. from Simpson Wedge-All anchors to the Simpson Strongbolt), they concluded that 6 months was an adequate time period to: adopt Acceptance Criteria, allow manufacturers to reformulate adhesives (if required) or modify anchors, set up a testing schedule, find an accredited lab to do testing, test all anchors, submit data to ICC and wait for an ICC report. After admitting that this was somewhat unreasonable, ICC-ES staff decided to allow adhesives and concrete screws to be used for another year (until Jan 1, 2008). See the memo for the following statement: "ES staff felt there was a need for an additional time period between the old requirements and implementing the new requirements, since there was some confusion regarding the requirements of AC308 and AC193 (for screw anchors)." However, although ICC-ES has allowed concrete screws and adhesive products another year of use, they have decided (as a compromise, I think) to only allow those anchors to be used in certain seismic zones.
Please see: http://www.icc-es.org/News/concrete_anchors_memo.pdf
How will this affect you?
In response to this document, I talked to DSA and OSHPD to see what their policies would be for 2007.
I met with Bill Staehlin at DSA on December 7th and Chris Tokas, Tom Hale and Karim of OSHPD on December 11th, 2006.
OSHPD's policy is as follows: "OSHPD will permit use of Anchors that comply with CAN 2-1925B-3-5 for buildings permitted under CBC 2001 ONLY. Building permitted under CBC 2007 need to comply with new CAN, which are not issued yet." This is from an email from Karim at OSHPD sent January 29th. In summary, for CBC 2001 building permits OSHPD will be accepting code reports valid before Dec 31, 2006 until California adopts the IBC 2006.
DSA's policy is as follows: "We do not have enforcement authority for Appendix D requirements from ACI 318-05 so the interim policy would be to continue to accept those report previously used prior to their being modified by ICC-ES around 1/7/07." This is from an email from Bill Staehlin at DSA sent January 30th.
I will continue to meet with other CA, WA, OR and NV Building Departments regarding this memo. I have already met with several other Building Departments in California, most of whom have decided to go along with OSHPD and DSA's stance and are waiting until the IBC 2006 is adopted in CA. Several Building Departments outside of California have also decided to wait (often 6 months until after IBC 2006 is adopted) to enforce these ICC requirements. This decision is based in part on the fact that there are NO products currently on the market with code reports that meet the Criteria of either AC193 or AC308
Please note that effective January 1st of 2007, the ICC/ICBO reports on the ICC website have had seismic recognition in Zones 2B, 3 and 4 (for concrete) removed. Products with seismic approval in CMU have retained seismic approval in CMU. DSA and OSHPD will continue to refer to the code reports valid prior to Dec 31st, 2006 which have seismic recognition for concrete. Note that both the revised reports and those reports valid prior to December 31, 2006 are shown on the Simpson Anchor website at: http://www.simpsonanchors.com/technicalinfo/code_transitions.html
What is Simpson Strong-Tie doing to meet the requirements of AC308 and AC193 (for concrete screws)?
Simpson Strong-Tie is currently in the process of testing the Titen HD and the Simpson SET adhesive in accordance with the new testing requirements of AC193 (for conc. screws) and AC308 (for adhesives.) We will continue to keep Engineers updated when new products and code reports are available. It is important to note, that at this point in time, there are NO products on the market with code reports that meet the criteria of either AC193 or AC308. Please call or email if you have any further questions.
Wendy Allen, PE
Simpson Strong-Tie Anchor Systems Field Engineer
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