Seismic Design of Adjacent Rail Bridges in Deep ... · PDF fileSeismic Design of Adjacent Rail...
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Seismic Design of Adjacent Rail Bridges in Deep Liquefiable Soils
Kelly Burnell, PE, Kleinfelder, San Diego, CAEbrahim Amirihormozaki, PhD, PE, Kleinfelder, San Diego, CA
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Project Purposes
Carries Commuter, Amtrak and BNSF Freight rail linesConstruct 0.9-mile segment of second main track
-LOSSAN Project-
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Project Purposes
11 mile Extension9 new stations
-Mid-Coast LightrailExtension Project-
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San Diego River Bridge
200 ft
Proposed Mid-Coast LRT Bridge
Existing LOSSAN BR 263.8
Existing LRT Bridge
N
Proposed LOSSAN Bridge Double Track
Ocean Beach Bike Path
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Typical SectionMid-Coast Lightrail BridgeNew LOSSAN Bridge
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Design Criteria for Different Structures
AREMA– 3 Level Seismic Performance
Criteria– Site Specific RSA
PGA (g)
Return Period(years)
Performance
Serviceability 0.13 100 Minor Damage, Structure useable
Ultimate 0.27 500 Inspectable Damage
Survivability 0.53 2400 Collapse Prevention
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Design Criteria for Different Structures
AREMA– 3 Level Seismic Performance
Criteria– Site Specific RSA
Mid-Coast Lightrail– Caltrans Seismic Design
Criteria• 1000-yr Return Period• PGA – 0.42g• Collapse PreventionPGA
(g)Return Period(years)
Performance
Serviceability 0.13 100 Minor Damage, Structure useable
Ultimate 0.27 500 Inspectable Damage
Survivability 0.53 2400 Collapse Prevention
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Response Spectra
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 1 2 3 4 5 6
PGA
(g)
Period (sec)
ARS Curves
Lightrail
AREMA - Level 1
AREMA - Level 2
AREMA- Level 3
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River Soil Conditions During Earthquake
Ultimate and Survivability Events – Liquefaction up to 80’ deepScour is up to 20 feetSlope Stability and Lateral Spreading
50
0
-50
-100
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Original Approach – Ground Improvement
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Original Approach – Ground Improvement
Ground improvement 90 feet deepConflicts with existing foundationsStaging of ground improvement
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Existing Trolley Bridge Approach– Ground Improvement
Ground Improvement around Shafts
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Alternative Approach – Permanent Steel Casings
LiquifiableAlluviam
Dense Gravels
11’
9’
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San Diego River
Approx. $4M Cost Savings
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Alternative Approach
Why not just use larger diameter conventional shafts?
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Seismic Design of Superstructure
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EQ EQ
Column Column
Bent Cap
Bearing
Deck
Girder
Floor Beam
Seismic Design of Superstructure
Bent Elevation
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Seismic Design of Superstructure
Local Seismic Design
Global Seismic Design
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Bridge Plan
Seismic Force
Seismic Design of Superstructure
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Resisting Cross Section
Seismic Force
Seismic Design of Superstructure
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Resisting Cross Section
Seismic Force
Seismic Design of Superstructure
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Resisting Cross Section
Seismic Force
Seismic Design of Superstructure
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Finite Element Model (SAP 2000)
Seismic Design of Superstructure
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Bridge Plan
Seismic Force
Shear Flow
Seismic Design of Superstructure
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1. Simplified Resisting Cross Section
2. Pay Attention to Shear Flow actions at ends of floor beams
Seismic Design of Superstructure – Key Points