HomeMy WebLinkAboutTC Res 2009-09-16 (2)RESOLUTION NO. 27-2009
A RESOLUTION OF THE TOWN COUNCIL OF THE TOWN OF TIBURON
ENDORSING AND AUTHORIZING USE OF RESIDENTIAL
SEISMIC STRENGTHENING STANDARD PLAN SET A
WHEREAS, the Town of Tiburon is subject to various earthquake-related hazards
including very violent ground shaking; and
WHEREAS, the U.S. Geological Survey has found that there is 62% chance that one or
more earthquakes of magnitude 6.7 or greater will occur on one of several active faults in the
Bay Area in the next 30 years; and
WHEREAS, the Town of Tiburon seeks to maintain and enhance a disaster-resistant
region by reducing the potential loss of life, property damage, and environmental degradation
from natural disasters, while accelerating economic recovery from those disasters; and
WHEREAS, the Town of Tiburon is committed to helping meet the need of Bay Area
residents for safe and disaster-resistant housing that is architecturally diverse and serves a variety
of household sizes and incomes; and
WHEREAS, the Town of Tiburon finds that un-braced or inadequately braced cripple
wall houses in the Bay Area represent a significant earthquake risk to the safety of residents and
their property; and
WHEREAS, a "Standard Plan Set A: Residential Seismic Strengthening Plan" (Plan Set)
has been developed by a committee representing ABAG's Earthquake and Hazards Program,
building contractors, the Structural Engineers Association of Northern California (SEAONC),
the California Building Officials (CALBO), the International Code Council (ICC) Tri-Chapters
(East Bay, Peninsula, Monterey Bay), and the Earthquake Engineering Research Institute (SERI)
Northern California Chapter, and each organization has formally approved of the Plan Set.
NOW, THEREFORE, BE IT RESOLVED, by the Town Council of the Town of Tiburon
that the Town:
a) Endorses and authorizes the use, where applicable, of "Standard Plan Set A:
Residential Seismic Strengthening Plan - 2008" as a prescriptive seismic strengthening plan for
cripple wall bracing of walls not more than four (4) feet high and foundation sill plate anchorage
of qualifying light wood-framed residential structures not more than two stories in height and
containing not more than two dwelling units, and
b) Strongly encourages its residents to utilize this Standard Plan Set A by promoting its
use as a minimum standard for seismic retrofitting.
Tiburon Town Council Resolution No. 27-2009 09/1612009 Page I
PASSED AND ADOPTED at a regular meeting of the Town Council of the Town of
Tiburon held on September 16, 2009, by the following vote:
AYES:
COUNCILMEMBERS:
Berger, Collins, Fredericks, Gram, Slavitz
NOES:
COUNCILMEMBERS:
None
ABSENT:
COUNCILMEMBERS:
None
ALICE FRE ICKS, MAYOR
TOWN OF TIBURON
ATTEST:
DIANE CRANE COPI, TOWN CLERK
Tiburon Town Council Resolution No. 27-2009 0911612009 Page 2
Nonstrucstural resources
Standard Plan Set for
[5 -S rn; A ..4. 10-, I I
This plan set is a "blueprint" version of a prescriptive ("cookbook")
standard for strengthening homes to better withstand earthquake
shaking. When approved by the local building official, the plan set
may be used to strengthen older homes without the need for costly
site-specific plans and design calculations. This plan set provides a
low-cost method to help improve an older home's chances of
surviving an earthquake.
Why Is the Plan Set Needed?
ABAG concluded that most homeowners are not retrofitting - and
those that retrofit are not doing all the work needed to significantly
change the likelihood that their homes will be habitable following
future earthquakes. One of the problems that homeowners mentioned
in an ABAG survey was that they did not know what to do. This plan
set is a tool to help homeowners know what needs to be done. They
can use the plan set to get bids from contractors, or, if experienced,
can do the work themselves.
DOWNLOAD Standard Plan Set A - Large Sheets
for Seismic Retrofit of Single-Family Wood-Frame Homes
NOTE - ABAG's Executive Board adopted the 2008 version of
this plan set on Sept. 18, 2008. Therefore, the files on this page
have been updated.
These sheets are difficult to view on a computer screen, but are
suitable for providing to your city or county building department to
obtain a building permit.
Standard Plan A - Page 1 - an Adobe Acrobat PDF file - 24" x 36" -
but legible on 11" x 17" paper
Standard Plan A - Pa,, ec2 - an Adobe Acrobat PDF file - 24" x 36" -
but legible on 11" x 17" paper
Model Resolution for Adoption by Cities and Counties
MORE Frequently Asked Questions
Why 24" x 36" and
how do I print these
large sheets? And
how many of these
sheets do I need to
htti): Hq u ake. ab ag. c a. gov/fixii/p lans et
page 1 of'3
The plan set is two sheets, each of which is
24" x 36." This size is standard for plans
required -by city and county building
departments for permits. You can view the
plan set on your computer. However, most
EXHIBIT No.
;.html 6/1/2009
What Is the Plan Set?
submit to my people don't have the capability of printing
building these large sheets. You can email them to
department? your local copy shop or download them to a
CD and take them to your local copy shop to
make copies. However, they are legible when
printed on 11" x 18" paper.
In addition, we are working with city and
county building departments to make the
plans available at their counters. Berkeley, El
Cerrito, Hayward, Livermore, Newark,
Oakland, and San Leandro have these plan
sets available at the counters of their building
departments.
The plan set states that the applicant for a
permit should submit two copies of the plan
set to the building department. Some cities
and counties may have different
requirements. Be sure and check with your
local building department to confirm that
this is the correct number of plan sets
required.
Who developed the The plan set was developed by a committee
plan set?
representing the East Bay, Peninsula, and
Monterey Bay chapters of the International
Code Council (ICC), along with
representatives from the Association of Bay
Area Governments (ABAG) Earthquake
Program, the Structural Engineers
Association of Northern California (SEAONC)
Existing Buildings, Seismology and Structural
Standards Committees, the California
Building Officials (CALBO) Seismic Safety
and Emergency Preparedness Committees,
the Earthquake Engineering Research
Institute (EERI) Northern California Chapter,
and building contractors specializing in home
retrofit.
Why does the plan
The plans intentionally allow the use of
set allow use of
EITHER 1/2" or 5/8" bolts. The calculations in
either 112 inch or 5/8
the plan set table were run for both types of
inch bolts, while the
bolts. Because the 1/2" bolts are smaller in
2008 code only
diameter, more of these bolts are required
discusses the use of
than if 5/8" bolts are used. Both should be
5/8 inch bolts?
acceptable for use for an engineered design,
which this is. While 5/8" bolts are a default
value for conventional new construction, the
use of 1/2" bolts in actually preferred by many
httD://quake.abag.ca.gov/fixit/plansets.html 6/1/2009
I N UIR- 1U UL bLUI CLl X'-_GbV U1 GGS
Is it a mistake, or
does the plan set
require use of3x3x
0.25 inch washers,
while the 2008 code
requires use of 3 x 3
x 0.229 inch
washers?
as the demand on an existing foundation and
mudsill at the specific point where the bolt
enters the mudsill and foundation is actually a
bit less.
Either thickness of washers is acceptable.
The key is that they should be 3" by 3"
rectangular washers, not the thin round ones
usually present in existing older homes.
The plan set allows
Those developing the plan set had access to
the use of expansion
the ICC ES report on expansion anchors. The
anchors, but most
calculations for how many anchors are
people don't have
required has, therefore, already been
copies of the ICC ES
performed.
report for detailed
information on how
many might be
required. Is this an
issue?
Has ABAG itself
Yes, ABAG's Executive Board passed a
acted in support of
resolution at its December 2004 meeting in
the plan set?
support of the original version of this plan set.
A second resolution, adopted at its
September 2008 meeting in support of the
2008 version of the revised plan set, was
passed in support of the revised verson of
this plan set.
Page 3 of 3
IMF-
-V15 CAPP ~ ake Info Home `"i rA Ws
ABAG, the Association of Bay Area Governments, is the regional planning and services
agency for the nine-county San Francisco Bay Area.
This page was last updated 5/19/08 by jbp.
htti)://Quake.abaR.ca.2ov/fixit/plansets.html 6/1/2009
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