Earthquake Enginneering

http://www.wsspc.org/Awards/2010/Humboldt_LOF_sample_presentation_slides.pdf
If home scores six or more points — have engineer,
architect, or contractor conduct evaluation for weaknesses
& complete threat analysis
• work on hazard mitigation
Soft story
• bolt the foundations because house will probably fall off foundations if not bolted
Unreinforced masonry
Inadequate foundation
Unbraced cripple walls
• foundation
• additions or modifications
• unreinforced masonry
• cripple walls
• vulnerable pipes
• large open ground floor space
• unbraced openings in lower story walls
• adequate design for hillside house
If you have a brick chimney —
• install plywood above ceiling framing
• retrofitted masonry chimneys
 bracing or strapping not effective
• don’t locate children’s playground
equipment near chimney

• avoid rental units —
 made of unreinforced masonry
 with “tuck‐under” parking spaces
• ask your landlord these questions:
 what retrofitting has been done to building?
 has water heater been strapped to wall studs?
 may I secure bookshelves and tall furniture to
wall studs?

How tall is your home?
Best split level, on a hillside or gentle slope 6 points
2nd best two or more stories with living area above garage 5 points
3rd best one story, three or more steps up to front door 4 points

Mobile homes:
• if only concrete blocks, or steel tripods or jacks
supporting home, you need either
“Engineered Tie‐Down System” “Earthquake‐Resistant Bracing System”