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Re: Sill plate washer - 2x2 or 3x3?

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I might mention that one of the adoptions to the current
California Building Code (1997UBC+Amendments) requires
thicker & larger square washers (upto 3-1/2" square).
The Coalinga quake and CUREE research also recommends
that it's placement be detailed parallel-perpendicular and no
further than 2" from shearply; to reduce cross-grain shear/bending.
CTruax
 
 
 
 
----- Original Message -----
From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
Sent: Tuesday, July 06, 2004 1:06 PM
Subject: RE: Sill plate washer - 2x2 or 3x3?

| This happened in the Provisions Update Committee voting and resolution of
| the BSSC.  The FEMA 450 Commentary (2003 NEHRP Commentary), Section
| 12.2.3.11 and 12.2.3.12 on page 237 discusses that there was splitting in
| the sill plate in testing and observed in earthquakes that the larger plate
| washers intended to mitigate.  I recall that debate as "stimulating".
|
| Regards,
| Harold Sprague
|
|
| >From: "Haan, Scott M." <
HaanSM(--nospam--at)ci.anchorage.ak.us>
| >Reply-To: <
seaint(--nospam--at)seaint.org>
| >To: <
seaint(--nospam--at)seaint.org>
| >Subject: RE: Sill plate washer - 2x2 or 3x3?
| >Date: Tue, 6 Jul 2004 11:27:58 -0800
| >
| >2003 IBC 2305.3.10 only mentions 2x2x3/16 plate washers.  I remember seeing
| >larger washers for wider sill plates in the NEHRP Recommended Criteria....
| >
| >-----Original Message-----
| >From: Dmitri Wright [mailto:dmitri(--nospam--at)pciengineers.com]
| >Sent: Tuesday, July 06, 2004 10:06 AM
| >To: Seaint
| >Subject: Sill plate washer - 2x2 or 3x3?
| >
| >
| >Dear List:
| >
| >For those who are working in areas adopting the IBC/IRC, here is an issue
| >you may be interested in.  It seems rather trivial, but I bet it will cause
| >plenty of bickering between the contractor/inspector/engineer/owner.
| >
| >The original question:
| >
| >I noticed in the errata to the IRC 602.11.1 that the sill washers that used
| >to be 2"x2" are now required to be 3"x3".  I did not see a similar errata
| >for the IBC 2305.3.10 which calls for a 2"x2" sill washer.  Was this the
| >intent of the ICC, and if so, why?
| >
| >Thank you for clarifying this.
| >
| >The response:
| >
| >     We are pleased to provide you with the following opinion. It should be
| >noted, however, that the final interpretation is the responsibility of the
| >local building official.
| >
| >     In the IRC, the 2 x 2 x 3/16 washer size was changed by errata to 3 x
| >3 x ¼  based on code change RB 82-02, submitted by the Building Seismic
| >Safety
| >Council & dealing strictly with coordinating the     IRC provisions with
| >2000 NEHRP Section 12.5.3. There was no similar code change to the IBC
| >provision, so it remained unchanged and we [ICC staff] have no basis for an
| >errata to the 2003 IBC on         this issue.
| >
| >     Subsequently, the Utah Chapter of ICC submitted code change S83-03/04
| >which changes the plate washer size to 3 x 3 x ¼ in IBC Sections 2305.3.10
| >[engineered shear walls] and                     2308.12.8 [conventional
| >construction]. This approved change will appear on the 2004 Supplement to
| >the International Codes available later this month. Supplement provisions
| >do
| >not automatically affect    the application of 2003 IBC, unless they are
| >incorporated as modifications through local adoption of the code.
| >     Alan
| >
| >So,  it looks like 3x3 is probably the safe bet, but good luck explaining
| >to the contractor who probably bought 5 cases of 2X2's before the steel
| >prices went up.
| >
| >Dmitri Wright, PE
| >Progressive Consultants Inc.
|
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