Metropolitan Atlanta Rapid Transit Authority

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Metropolitan Atlanta Rapid Transit
Authority Lindbergh Center Station Transit
Oriented Development Case Study South Concourse
Modifications to Add New Platform By J. Michael
Garver, P.E. Supervising Structural Engineer
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Sandy Springs Station
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Sandy Springs Station
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North Springs Station
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North Springs Station
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• MARTA at a Glance
• Total Buses 704
• CNG Buses 222
• Rapid Rail Cars 280
• Rail Stations 38
• Miles of Track 48
• Daily Ridership 550,000
• 3.5 Billion Patrons since 1972

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Lindbergh City Center Transit Oriented Development

• Blend of Commercial, Office, Retail and
  Residential Space around a Transit Station
• 1.23 Million Square Feet of Office Space
• 421 Residential Units
• 190-Room Hotel
• 330,000 Square Feet of Retail
• 5600 Parking Spaces in 5 Parking Decks

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Atlanta, Georgia
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Lindbergh TOD Site Plan Full Expansion
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Lindbergh TOD Aerial Site Plan Full Expansion
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Site Looking North
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Existing Station Layout
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South Concourse Building Section
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Phase 1Under Platform Columns East Platform
Foundations
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Phase IIExtend North Concourse Add Concourse
Level Bridges
TemperaryProtection
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Return
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Return
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Phase II Extend North Concourse Add Concourse
Level Bridges
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Phase II Extend North Concourse Add Concourse
Level Bridges
Concourse Level Plan
Foundation Platform Level Plan
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Phase IIIExtend South Concourse Add Concourse
Level Bridges
Concourse Level Plan
Foundation Platform Level Plan
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South Concourse Looking to the North
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New South Concourse at Platform Level
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New South Concourse Looking to the North
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South Concourse at Main Street
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New South Concourse Model

• Model Summary
• 1095 Joints
• 408 Members
• 865 Elements
• 501 Spring Supports
• 31 Independent Loads
• 42 Dependent Load Cases

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New South Concourse Overall Model
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New South Concourse Track Slab Retaining Walls
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Plate Element Type SBHQ6
Plate Element Type SBHT6
Element Properties
Loading Input
Output

• Rectilinear or Triangular
• Definition 4 or 3 Nodes Thickness
• 6 Degrees of Freedom
• Rigidity Matrix

• Concentrated at Joint
• Temperature at Joint
• Surface of Element
• Body of Element

• List at Nodes Stress/Moment Shear Resultants
  Element Forces
• Calculated Averages Stress Principle Stresses
  Resultants Principle Membrane Resultants Von
  Mises Stress

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Model Coordinate Systems
Global Coordinate System
Element Coordinate System
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New South Concourse Concourse Framing
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32 DiameterConcreteColumns
Return
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Concrete Inverted Tee Beams
Return
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Concrete Box Girders
Return
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Concrete Box Girders
Return
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New South Concourse Concourse Framing
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New South Concourse Roof Framing
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New South Concourse Building Section
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New South Concourse Mxx max
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EXISTINGSOUTH CONCOURSE EXPANSIONTake 1
You won't believe what the architects want to do
this time!
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South Concourse Slab Extension PLAN A(Clear
Span the Station)
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South Concourse Slab Extension PLAN A(Clear
Span the Station)
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Model Dimensions
South Concourse Slab Extension Stage I (Existing
Conditions)
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Full Frame Contour Envelope of Mxx max
South Concourse Slab Extension Stage I (Existing
Conditions)
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Concourse Slab Contour Envelope of Mxx max
South Concourse Slab Extension Stage I (Existing
Conditions)
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Concourse Slab Contour Envelope of Mxx min
South Concourse Slab Extension Stage I (Existing
Conditions)
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Model Dimensions
South Concourse Slab Extension Stage I (Existing
Conditions)
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Model Dimensions
South Concourse Slab Extension Stage II
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Existing Concourse Slab Opening
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Existing Concourse Slab Opening
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Model Dimensions
South Concourse Slab Extension Stage II
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Model Dimensions
South Concourse Slab Extension Stage II
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Full Frame Contour Envelope of Mxx max
South Concourse Slab Extension Stage II
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Full Frame Contour Envelope of Mxx max
South Concourse Slab Extension Stage II
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Concourse Slab Contour Envelope of Mxx min
South Concourse Slab Extension Stage II
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EXISTING SOUTH CONCOURSE EXPANSIONTake 2
Upper Management says "It costs too much! Fix
it! "
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South Concourse Slab Extension PLAN B (Add a
Column Line on the Center Platform)
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South Concourse Slab Extension PLAN B (Add a
Column Line on the Center Platform)
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Model Dimensions
South Concourse Slab Extension Stage III
(Existing Conditions)
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33-7
25-7
Model Dimensions
South Concourse Slab Extension Stage III
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Model Dimensions
South Concourse Slab Extension Stage III
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Full Frame Contour Envelope of Mxx max
South Concourse Slab Extension Stage III
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Full Frame Contour Envelope of Mxx max
South Concourse Slab Extension Stage III
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Concourse Slab Contour Envelope of Mxx min
South Concourse Slab Extension Stage III
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EXISTING SOUTH CONCOURSE EXPANSION Take 3
The Contractor says We dont want to build it
your way,we want to build it our wayor it will
cost more money! Fix it! "
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South Concourse Slab Extension PLAN C (Remove
Part of Existing Wall Before Building New Wall)
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South Concourse Slab Extension PLAN C (Remove
Part of Existing Wall Before Building New Wall)
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Model Dimensions
South Concourse Slab Extension Stage IV
(Existing Conditions)
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Model Dimensions
South Concourse Slab Extension Stage IV
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Concourse Slab Contour Envelope of Mxx max
South Concourse Slab Extension Stage IV
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Existing South Concourse East Abutment
Concourse Slab Contour Envelope of Mxx max
South Concourse Slab Extension Stage IV
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Existing South Concourse East Abutment
Concourse Slab Contour Envelope of Nxx max
South Concourse Slab Extension Stage IV
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Construction Status
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QUESTIONS