Transcript Easily Achievable Earthquake Risk Reduction Measures

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Meet the DBI Pros Summit
October 25, 2006
Amy Lee, Acting Director
RESIDENTIAL EARTHQUAKE
PREPARATION
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Residential Earthquake
Preparation
Joe Duffy, Senior Building Inspector/DBI
 Howard Zee, Structural Engineer/DBI
Major Plan Check
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Earthquake Preparedness
Presented by Joe Duffy & Howard Zee - San Francisco Department of
Building Inspection DBI Summit October 25, 2006
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Marina photo1
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Marina photo2
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Marina photo3
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PERSONAL
PREPAREDNESS
Make your family
and home as safe
as possible.
www.72hours.org
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Develop a Family Emergency Plan
Locate safe shelter
areas in your home
 Identify places to store
emergency supplies
 Arrange where to meet after a
disaster
 Establish a distant phone
contact
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Assemble and Maintain
Emergency Supplies
 Home
 Work
 Vehicles
 Transportable
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Your “Grab & Go” Bedroom Kit
 Shoes
– sturdy, with socks
 Crowbar
 Leather
work gloves
 Flashlight
 Cash,
w/batteries
ID, cell phone
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“Grab & Go” Items
 ATM,
credit cards
 Essential medication
and eye glasses
 Whistle
 Scissors
 Watch or clock
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Water – Minimum
1 gallon/person/dayx5
Unopened store-bought drinking water –
check expiration date
 Stored tap water should be purified
before using
 Store in cool, dark place secure from
animals and easy to get to
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Home/transportable supplies
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Water purification kit
First aid kit and instruction book
Antiseptic wipes or baby wipes
Foods requiring little heat or water
Can opener, eating utensils
Toilet paper and personal hygiene items
Butane barbeque igniter or matches
Large garbage bags, duct tape
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more home/transportable supplies…
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Battery-operated radio, spare batteries
 Flashlights, spare batteries, and bulbs
 Blankets for all family members
 Warm clothes
 Diapers, if needed
 Pet food, leash, and carrier, if needed
 Tent, sleeping bags
 Backpacks to carry emergency supplies
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Utilities
Train family to turn off utilities,
if necessary (not automatically)
Natural gas
 Electricity
 Water
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Natural Gas
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Teach children to identify
the smell of gas (rotten
eggs)
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Turn off gas if you smell
leaks & are unsure
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Turn off gas if your meter
wheels are spinning
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Turn off gas if necessary (suspect
leaking gas, broken pipes)
 Call PG&E to turn gas back on
 Do not turn gas back on yourself
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Natural Gas
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Water
Turn off
water if
house is
flooding
or if water
is
contaminated
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Shut off Water, IF necessary
Locate water
shutoff
 Insert tool in hole
& remove cover
 Turn water OFF
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Home Preparedness Structural
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Structural evaluation by
architect or engineer
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Seismic upgrade/retrofit
Meets Code requirements
Do-it-yourself strengthening
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Improves strength, but not a true
seismic upgrade/retrofit
Not as good, but better than
nothing
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Seismic Upgrade or Seismic Retrofit
Building permit required for voluntary
seismic upgrade/retrofit per SFBC
3403.6 and 3403.2.2.2
 Engineered design by architect or
engineer
 Civil engineer or structural engineer
 Fee: a few thousand $
 It’s a seismic upgrade / seismic retrofit
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Do-it-yourself Voluntary
Strengthening
No drawings required, but must get a
building permit
 Engineer’s stamp not required
 Architect’s stamp not required
 It’s NOT a seismic upgrade or retrofit
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Description of work:
“voluntary strengthening work
to add anchor bolts and
plywood at lowest story, etc”
Residential Permit Counter
(1st floor)
No drawings, architect, or
engineer required
Over-the-counter permit
approval
It’s NOT a “seismic upgrade
or retrofit”, it’s simply a
seismic “strengthening”.
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General Guidelines and Tips for
Voluntary Strengthening
Adding anchor bolts
 Strengthening cripple walls
 One size does NOT fit all
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Anchor Bolts
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Access and
space to work
 Mud sill
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Anchor Bolt Guidelines
California Building Code Requirements
5/8” or ¾” diameter (A307 or A36)
 At least 7” embedment into foundation
 Spaced not more than 4’ apart
 Minimum of 2 bolts per piece
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One bolt located not more than 12”, and
not less than 5 ½”, from each end of the sill
piece
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Anchor bolt
Epoxy type adhesives best for older
concrete foundations (Simpson, CIA,
Hilti, etc)
 Expansion anchors
 Approximate cost per anchor
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Bolt Sill to Foundation
Using Square Plate Washers
Square plate washers
perform better in
quakes than round
washers
Galvanized steel
plates best
Plate washers must be a minimum
of 2” x 2” x 3/16” thick
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Strengthen
Cripple Walls
First Floor
Crawl Space
Cripple Wall
A cripple wall is generally the weakest part of
older building because it has insufficiently strong
sheathing materials. This can cause full or partial
collapse in an earthquake.
These areas can be
strengthened for relatively
low cost by correctly
applying plywood sheathing
to the cripple walls.
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Plywood Guidelines at Cripple
Walls
½” thick, C-DX or Structural I
 Minimum 4’ long segments, but longer
segments better
 Well distributed among all cripple walls,
all sides of house. Cover the corners.
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Plywood Guidelines at Cripple
Walls
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Use 8d or 10d COMMON nails, not box or
sinkers, and not 1 ½” shorts
Galvanized nails best, but not essential
Nail along all edges of each sheet of plywood
(add blocking); 4” or 6” o.c.
Vent holes
A34 metal connectors
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Home/Building Preparedness
Nonstructural Items
Chimneys
 Lighting fixtures
 Water heaters
 Wall hangings
 Furniture
 Appliances
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Water Heaters
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Earthquake
strapping of
water heaters
 2 metal straps
 1/3 points
 Anchor to studs,
not just drywall
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Additional Information
72hours.org website
 USGS.org - personal and home
 FEMA 526 – personal preparedness
 Call 800 480 2520 to order free FEMA
documents
 NERT– www. sfgov.org/sffdnert
 ABAG – www. quake.abag.ca.gov
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Display boards
 Hilti and Simpson reps in lobby
 DBI Information booth in lobby
 Again, www.72hours.org website
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QUESTIONS ?
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Use the microphone
 Please limit each question to a couple
minutes maximum
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Thank you for attending!
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