ESS 202. This lecture Dams Buildings Proper response to a quake Real odds in a quake.
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Transcript of ESS 202. This lecture Dams Buildings Proper response to a quake Real odds in a quake.
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ESS 202
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This lecture
•Dams•Buildings•Proper response to a quake
•Real odds in a quake
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Manmade hazards
• Certain structures present a hazard to neighboring or nearby buildings, including– Dams and reservoirs– Dikes and levees– Water tanks– Neighboring buildings
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Dams and reservoirs•Dams are structures most hazardous to populated areas
•Heavily populated urban areas like LA and SF contain many small reservoirs within city limits
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Dam collapses
•Sheffield Dam in Santa Barbara
•St. Francis Dam near Saugus•Baldwin Hills Reservoir•Van Norman Dam near San
Fern.
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Sheffield Dam
• Sheffield Dam failed in Santa Barbara earthquake of 1925 (M7)– 250 m long, 5 m high, 30 million
gallons– 100 m of dam liquefied and washed
down– flooded lower Santa Barbara
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Before filling
EQ Eng.10-58
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Ex-dam after quakeUCSBwebLiquefaction
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St. Francis Dam Keller, 3-24
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St. Francis
• St. Francis Dam near Saugus, CA– Failed March 12, 1928 at night– 500 people killed, $10 million is
damage
• Problem complicated– Rocks softened when wet– Fault zone carried water
• Dam sprung a leak
– Then softened rock slipped, dam failed
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St. Francis after failureKeller, 3-24
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Flooded area
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Mulholland’s downfall• Chronicled in movie
“Chinatown”• Built the dam through intrigue• Just hours before collapse
– He visited dam– Saw water streaming out– Advised ignoring the problem
• Crucified after failure• Hermit for rest of life
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Mulholland told the Coroner’s Inquest that he “only envied those who were killed”
•He went on to say “Don’t blame anyone else, you just fasten it on me. If there was an error in human judgment, I was the human”.
Coronor’s inquest
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Another dam collapse• Baldwin Hills Reservoir
– December 14, 1963– failed after weakening by several years of
creep on Newport-Inglewood fault– Constructed in 1951, but built on the fault
zone responsible for 1933 Long Beach earthquake
– Claimed 5 lives despite quick evacuation of area below reservoir, 2 hours of warning, $15 million in property damage
– Fault creep may have been related to withdrawal of oil underneath from 1923 to 1963
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Baldwin Hills Dam failure
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Breachin dam Keller, 3-11
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View of damafter failure Keller, 3-11
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DownstreamYanev75
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Map of flood
Keller, 3-11
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Near collapse of dam
• Lower Van Norman Dam in San Fernando earthquake of 1971– Constructed in 1915, reinforced
several decades later– Quake shook upstream surface
into reservoir, left only 5 ft margin above water
– Threatened 12 square miles with 80,000 sleeping residents
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Van Norman Dam
Yanev74
Close call
Road slumpWater rose
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Tanks• Heavy and may be old and weak
– Thin-walled and flimsy
• May collapse during quakes• Several kinds
– Water– Oil– Wine
Nogales Bay, 1906
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Ex-elevated water tank1952 Kern County tank
Yanev, 76100’ tall, 100,000 gallon
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Seattleradio
stationKJR
EQ Eng, 192
Olympia quake of 1949
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Neighboring buildings
• Two adjacent buildings usually respond to earthquake vibrations in different ways and therefore may pound against each other– especially bad for higher building
at roof level of lower one
• Or one may fall on another• Or corner buildings may flop out
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SantaCruz1989 Yanev, 78
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MexicoCity1985
Yanev, 80
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Hit by neighbor’s bricks Yanev, 79
SantaCruz1989
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Corner building flops out
Yanev, 81
Missing 1st floor
Marina district, 1989 Loma Prieta quake
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Structural componentsof a building
• Distributing elements– are horizontal– consist of floors and roof
• Resisting elements– are vertical– consist of walls, columns, bracing
• Foundation• Connections
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Elements of a building
Yanev, 84
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How do earthquake forces affect buildings?
• Structural elements designed to support weight – of building, furnishings, occupants
• Therefore, vertical forces of earthquake are usually resisted effectively by buildings
• However, lateral bracing needed to resist horizontal forces (ground shaking or wind)
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How bracing reduces lateral motions
• Reduced lateral motion results in smaller accelerations and less damage to building and contents
Shaking in earthquake
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Diagonalbracing
Yanev, 86
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Shear wallsbeing built
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Earthquake resistance
• Wood frame (and with stucco)• Unreinforced brick• Concrete block• Reinforced brick• Unreinforced stone and adobe• Steel frame• Concrete frame• Concrete shear wall• Concrete tilt-up
Commercial
Residential
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Wood-frame buildings
• If well-built, safest structures due to lightness and flexibility of wood
• May still have damage if– On unstable ground– Not well fastened to foundation– Inadequate lateral bracing– Poorly maintained– Weak foundation
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Plywood sheathing
Yanev91
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Concept of soft story
•Large openings reduce shear strength of walls–openings include garage, windows, doors
–often but not always at ground level
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Soft-story construction
Yanev, 112
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Irreparable
Yanev, 112
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Wood-frame with stuccoed walls
• Stucco adds weight, therefore makes building weaker
• 1 " of stucco strong as 1/4 " plywood
• Stucco damage is around openings where stresses concentrate
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Cracked stucco
Yanev94
Marina District in 1989 again
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It wasn’t supposed to do this
Yanev94
San Fernando 1971
Note open story
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Unreinforced brick buildings
• Most dangerous type in earthquake– suffer most severe damage– cause majority of deaths
• Difficult and costly to repair and strengthen
• 9500 brick buildings in Los Angeles area
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Stanford entrance
Iacopi
Before
After1906quake
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Why are they so dangerous?• Brick is heavy and
inflexible• So lateral motions create
large inertial forces that crack mortar (usually weak).
• Bricks can separate, walls collapse unless wood-frame interior walls can hold up building.
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1933 Long Beach
Yanev98 Held up by wood
frame
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Examples of problems with brick structures
• In 1952 Kern Co. quake, only 1 of 71 brick buildings in Bakersfield survived undamaged
• In 1983 Coalinga quake most of 90 brick buildings removed
• Most of 64 killed in 1971 San Fernando died in collapse of a brick hospital
• Most of deaths in 1989 Loma Prieta not due to collapsed freeway were caused by falling bricks
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Hard to reinforce URM buildings•Strengthening is inhibited
by–High retrofit costs–Trend toward historical preservation
–Budget cutting–Lack of landlord concern
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Yanev, 106
Not aretrofit
strategy
How to build reinforced
brick
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Façadetrouble
Yanev, 102
Note mismatchedbuilding heights
5 killed inparked cars
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Clay tile disaster
Yanev, 106
Veteran’s Hospital, San Fernando
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Unreinforced stone and adobe
• Have practically no strength for resisting lateral forces of earthquakes
• Difficult to strengthen– Not feasible except for historical
monuments• Many such buildings in Central and
South America, Southern Europe, and Asia
• Responsible for numerous casualties
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Leninakan Cathedral
Armenia
Yanev, 107
19th century building
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Cathedral, after 1988 quake
Yanev, 108
Unreinforced stone
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Commercial buildings
•Steel-frame buildings•Unreinforced masonry•Concrete-frame•Concrete shear wall•Concrete tilt-up
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Welds in steel frames -serious business
• Example: St. John’s Medical Plaza in Santa Monica– 5-story office space and exam
rooms for doctors built in 1986• Damaged in 1994 Northridge
quake– No visible problems– Inside walls, vital welds were
broken– $10,000,000 lawsuit
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The building,a lawyer,and somebad welds LA Times
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The typeof framethat hastroublein LA
LA Times
The San BernadinoRegional HospitalComplex at Colton
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Larger issue• Metal used in welding is weak
– “120” or “E70T-4”– This metal has been used across
western US for decades– 1500 LA buildings use this welding metal– 150 had cracks in Northridge– Which was only an M7 quake
• Was outlawed in LA in July 1996– For new construction only, of course
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One of the villains
E70T-4LA Times
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Technical details
• About as strong as other welds• But, 1/4 as resistant to cracks as
other welding metals– Difficult to measure
• Can be applied from thicker wire at higher temperature– So using this metal speeds up welders
by 20-30%– Which saves money
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Side view of weld
Firstcrack
LA Times
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Whose fault was (is) it?• Company that made it (Lincoln)
– Know welding material best• City of LA
– Style of construction should have been outlawed
• Engineers that designed buildings– Their job to make building that works
• Welders who assembled buildings– Establishes standards for welding
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History is murky
• Lincoln people claim not to know what metals they tested and when
• University researchers paid by Lincoln also developing faulty memories
• Easy for LA to claim ignorance
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Concrete-frame structures• Second most dangerous structure• Uses concrete beams and columns
in same manner as steel beams are used on steel frame buildings– but more brittle and much heavier
• Cypress freeway (I-880) had this type of construction
• Many collapsed in Mexico City in 1985 M~8 quake (10,000 deaths)
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I-880 viaduct collapse in 1989 Loma Prieta
Yanev, 110 Concrete frame
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Overpasses
www.exploratorium.edu
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Concrete frame buildingin 1985 Mexico City quake
Yanev, 111 Note soldiers removing debris
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Iacopi,119
Parking garage at Cal State Northridge in 1994 Northridge quake
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Tilt-up building collapsed in 1971 San Fernando quake
Yanev,114
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Base isolators
• Decouple motion of building from ground• Part of major renovation: LA City Hall
http://www.lacityhall.org/Index.htm
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Retrofitingredients
• 526 isolators / sliders installed• 52 viscous dampers installed in the
basement and 12 viscous dampers installed in the tower
• 30,000 cubic yards of concrete• 16 million pounds of reinforcing steel• 35,000 cubic yards of earth excavated• $300 million
City Hall1853 - 1883
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Base isolators
In action - 21” of motion
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Viscous dampers
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The “moat”allows
buildingto float
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More steel
Old 10th floor ceiling
New 10th floor ceiling
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Particular problems
•Foundations•Cripple walls•Stilts and pilings•First-floor garages•Parapets•Chimneys
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Older house simply resting on foundation, not attached to it
Yanev119
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(1) Continuous, tied foundation
Yanev117 Many bolts, not just perimeter
Garage
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(2) Mat foundation• Reinforced concrete slab resting on soil• Used on soft soil
– Stronger than continuous, tied foundation– Minimizes hazard from differential soil
movements by bridging over pockets of loose soil Turkey, too much liquifaction
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(3) Drilled pier foundation• Steel or concrete
pilings set deep in ground
• Used on very soft, weak, or unstable soils
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Cripple walls• Walls of crawl space
– Short wood walls used to elevate house above ground
– Access to substructure and utility lines• Often a weak zone in older house
– Because a crawl space has only peripheral walls but no interior walls to absorb the force of shaking
– Badly braced cripple walls 2nd most common weakness of older houses• Next to chimneys
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Cripple wall failure in 1971 San Fernando quake
Yanev125
Fallen brick veneer Diagonal bracing not strong
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Great views but houses on stilts need special attention
Yanev131
Safer if metal supports embedded in concrete piers
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Worst case scenario -Aptos house, in Loma Prieta quake
Yanev131
Road
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Row of braced stilts
Yanev131
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First floor garages
• Garage is large room with only three walls– Resists shaking less well
• Remedy is shear bracing– Plywood or– Steel frame
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Steel I-beam frame in middle of garage
Yanev136
I-beams
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Parapets
• Masonry parapets often first components to fail in quake– Building top undergoes highest amplitude shaking– Parapet may be poorly connected or weakened by
weathering– Often out of sight, so poorly maintained – Often located above entrances– Danger to people running out of building
• May need to be shortened, anchored, and capped with reinforced concrete
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Yanev143
Fallen parapet in downtown Whittier 1987 quake M 5.9
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Chimneys• Heavy and high up, subject to strong forces
during quakes• Often damaged
– 75% of chimneys fell in Bay Area in 1906 quake
• Masonry (brick or stone) chimney pre-1960 is unlikely to be tied to structure adequately and may collapse in quake– Can fall through roof or break away from house– the higher it rises above roof, the greater is hazard
• Often breaks at roofline
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Through the roof
Yanev145
Alhambra housein 1987 Whittier
quake
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Remedies for chimneys
• Lay 1 inch thick plywood on roof around chimney
• New prefabricated sheet-metal chimneys are light and strong and will not collapse
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Rest of lecture
• Interior damage–How to be prepared for quakes
–How to behave during quake
•Insurance•Risk in earthquakes
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Anchor tall furniture
Yanev155
Note railings on shelves
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Kitchens -amazing
mess
Yanev158
1971 San Fern,mine looked
worse in 1989
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Use positive latches
Yanev157
For fragile valuables and dangerous chemicals
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Places of work
Yanev159 Ceiling tiles in motion, wires hanging
Whittier, 1987
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Planning for quakes
•Consider safe and dangerous places in your house
•Consider how to get to exits•Learn how to shut off utilities
•Anchor water heater
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Anchor water heater
Yanev153
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Careful quake planning
• School evacuation• Adequate supplies• Pets• Outside communication coordinator• Skills of neighbors
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Adequate supplies
• Water– Water heater and toilet tanks
• Purification tablets helpful
• Food– Usually several day’s food around– Use refrigerated food first
• First aid kit– And a book on first aid– Useful to take first aid course as well
• Fire extinguisher– Needs periodic checks or servicing
WaxBaywatch
figures
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During quake
• Get under table or go to doorway
• Avoid big windows and chimneys
• Do not rush outdoors or into stairwells
Olive View HospitalSan Fernando quake,
3 out of 4 fell over
Stairwell
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Once quake stops
• Walk slowly outdoors• Stay in open areas• Only re-enter safe buildings• If in a car
– Stop in an open area– Stay in car a while
Seatac control tower
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After quake
•Care for injured people•Check
–Gas lines–Electric lines–Then water lines
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Gas lineshut-off
Yanev152
Just takesa wrench
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Electrical turn-off
Yanev152
Main fuse box Circuit breaker
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Water shut-off
Yanev152
Special tool
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Then
•Remember–Try to minimize phone use–Tsunamis are possible–Aftershocks are certain and may be dangerous
–Landslides are possible
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Broken gas line
Yanev151 Porch fell down on gas line, Santa Rosa, 1969
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Fell off foundation
Yanev151 Watsonville, 1989 Loma Prieta quake
!?
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Gas leak ignited
Yanev151
Watsonville, 1989 Loma Prieta quake
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Broken water main
Iacopi82
1994 Northridge quake
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Disrupted power relay
Iacopi104 1971 in Sylmar
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Lingering traumaIacopi, 108
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Earthquake insurance
• No simple strategy• Changing state regulations• Deductibles• Vulnerability of insur. co.• FEMA (Federal Emergency
Management Agency) as back-up for insurance
• Should make house safe, in any case
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Real risk from quakes• Standard unit of risk
– 1 in a million chance of death in a year– In other words, a person loses 30
minutes of life expectancy
• Math– 30,000,000 sec in a year– 1/1,000,000 risk– Average person has 60 yr life ahead– Thus, cost of 30 minutes on average
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Example
• Cigarette smoking– Each cigarette adds about 1 in a
million chance of death– So smoking a cigarette shortens
life, on average, by half an hour, or several times longer than the cigarette takes to smoke
Langston Hughes
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1 in a million risks• Smoking a cigarette
– Cancer, heart disease
• Drinking half a bottle of wine– Cirrhosis of the liver
• An hour in a coal mine– Black lung
• Three hours in a coal mine– An accident
Wilson, 1979
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More
Evel Kenievel
Los Angeles
• Air pollution– Living 2 days in NY or Boston
• Accidents– 6 minutes in a canoe– 10 miles on a bicycle– 150 miles by car– 1000 miles by jet
• Cancers– 6000 miles by jet– Living 2 months in Denver (high altitude)– 2 months in a stone building (radioactivity)– 1 chest X-ray
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Still more1 in a million
risks
• Cancers– Living 2 months with smoker– 40 tbsp. peanut butter (aflatoxin
B)– Miami water for a year
(chloroform)– 30 cans of diet soda (saccharin)– 100 charcoal broiled steaks
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• All natural causes (age 40) 1 in 850• Violence or poisoning 1 in 3300• Traffic accident 1 in 8000• Quake (living in Iran) 1 in 23,000• Train accident 1 in 500,000• Quake (California) 1 in 2,000,000• Lightning 1 in 10,000,000• Windstorm 1 in 10,000,000
Risk of dying in a year