Northern California Earthquake Hazards Workshop February 12, 2014.
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Transcript of Northern California Earthquake Hazards Workshop February 12, 2014.
Northern California Earthquake Hazards WorkshopFebruary 12, 2014
Program Objectives
• Render BART system earthquake safe under Design Basis Earthquake (DBE). In general, “safe” = “noncollapse”.
• To the maximum extent reasonable and prudent, retrofit portions of the system to operability under the Lower Design Basis Earthquake (LDBE). “Operability” = return to train operations within a short period of time (1 -2 weeks)
Seismic Standards
DBE (Safety) LDBE (Operability)
BART System 500 year return or median plus ½ standard deviation, whichever is larger
Median
Transbay Tube 1,000 year return or median plus 1 standard deviation, whichever is larger
500 year return or median plus ½ standard deviation, whichever is larger
Original Program Scope
Current Program Scope
Status of Earthquake Safety Work
Other Contracts (Not Shown)
Daly City B206:Completed Construction
Lake Merritt Admin. Bldg. Dismantling:Completed Construction
34.5KV Electrical Upgrade:
Systems and Equipment (Transbay Tube):Completed Construction
4th Street Warehouse:Completed Construction
Systems and Equipment Supports:Completed Construction
In Construction
MIsc. Retrofits:Design
C O N T R AC O S T A
C O U N T Y
A L A M E D AC O U N T Y
S A NF R A N C I S C O
C O U N T Y
S A NM A T E O
C O U N T Y
16th St. MissionMUNI Church St. Sta.
EmbarcaderoMontgomery St.
Powell St.Civic Center
24th St. Mission
Lake Merritt
FruitvaleColiseum
San Leandro
Bay Fair
Glen ParkBalboa Park
Daly City
Daly City Yard
Castro Valley
Dublin/Pleasanton
Richmond
Richmond Yard
El Cerrito del Norte
El Cerrito Plaza
Concord
Concord Yard
Pleasant Hill
Walnut Creek
Rockridge
OrindaLafayette
N. Concord/Martinez
South Hayward
Hayward Yard
Oakland Shops
San Bruno
SFIA
Millbrae
Hayward
Union City
Fremont
Berkeley
North Berkeley
Ashby
MacArthur19th St. - Oakland
Oakland VentStructure
San FranciscoTransition Structure
West Oakland
South San Francisco
Colma
Pittsburg/Bay Point
BA RT EA RT H Q U A K E SA F ET Y P RO G RA MWO RK ST A T U S
Oakland CityCenter 12th St.
P
PPP
P
P
Status of Work in ProgressCompleted ConstructionCurrent ConstructionDesignNo Retrofits
Remaining Work
• Retrofit Fremont Line aerial structures between Lake Merritt and Coliseum
• Complete 10 stations (7 in construction now)
• Upgrade 4 aerial structure piers along Richmond Line
• Retrofit interior liner in Transbay Tube (3 areas) and upgrade pumping system
• Expected completion: Fremont Line 2018, Transbay Tube 2023
EQ Damage Prediction
Other Seismic Preparedness Efforts
• Earthquake Early Warning System: Provides advanced warning (15 sec to 1 min) of large earthquake ground motions approaching the BART system.
– Primarily for warning of distant earthquakes.
– Tied to BART train control system – slows trains to reduce derailment or other possible effects.
• Feasibility study for retrofit of Berkeley Hills Tunnel, which crosses the Hayward Fault.