06 Fantaye PPT muros colados

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Design and Performance of the Buttress Wall at Vehicular Security Center, World

Trade Center New York City, NY

Mueser Rutledge Consulting Engineers14 Penn Plaza – 225 West 34th StreetNew York, NY 10122917-339-9300

Sitotaw Y. Fantaye, P.E., AssociateLixun Sun, PhDT.C. Michael Law, PhD, P.E., Associate

Site Photo: Taken December 2010

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Site Plan: Vehicle Security Center

L i b e r t y S t r e e t

A l b a n y S t r e e t

W o r l d T r a d e C e n t e r

Outline of VSC Basement Walls

C e d a r S t r e e t

90 West(20‐StoryHistoricBuilding)

130 Cedar Street

Cutoff wall phase 1

• Owner – Port Authority of NY and NJ

• Contractor – EE Cruz/ Nicholson JV

• Engineer of Record – Liberty Security Partners/ Mueser Rutledge Consulting Engineers

Acknowledgements:

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• Essential facility for the function of the WTC

• Vehicle screening and tour bus parking

• Southern expansion of the WTC

• Entirely below grade structure

• Plan area of 200 x 400 feet

• 60 to 100 feet of excavation

• Groundwater 10 feet below grade

• Excavation support required on 3 sides (West, South and East) – Existing original WTC wall on North

• Proposed wall along south located against the vault of an existing historic 20 story structure – 90 West

Background: Vehicle Security Center

A A

Site Plan: Vehicle Security Center

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B

B

Geologic Profile: Section A ‐ A

130 Cedar Street

90 West Street

Rock

Fill

Organic

Sand

Decomposed Rock

310

300

290

280

270

260

250

240

Elevation(PA DATUM)

Till

Geologic Cross‐section: Section B ‐ B

Organic

Sand

Fill

Till

Rock

SlurryWall

56 Ft. Excavation

90 West St20-Story Historic Building

TimberPiles

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Design Concept I: Slurry Wall

• Construct slurry wall at VSC perimeter

Slurry Wall

V A U L T / S I D E W A L K

Existing high rise structures with one basement level supported on piles

Design Concept I: Stand‐off frame



• Excavate and install stand-off frame using pin piles to allow installation of tieback anchors below the tip elevation of the timber piles supporting the Historic 90 West Building

Stand-Off Frame

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C

C

Design Concept I: Tieback Anchors

• Install tieback anchors

Tieback Anchors

Construction Sequence1. Guide Wall

Design Concept I: Section C ‐ C

1.

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Construction Sequence1. Guide Wall2. Slurry Wall

2.


Construction Sequence1. Guide Wall2. Slurry Wall3. Pin Pile

3.

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Construction Sequence1. Guide Wall2. Slurry Wall3. Pin Pile4. Excavate (stage 1)

4.


Construction Sequence1. Guide Wall2. Slurry Wall3. Pin Pile4. Excavate (stage 1)5. Wale/blocking/tieback

anchor

5.5.5.

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Construction Sequence1. Guide Wall2. Slurry Wall3. Pin Pile4. Excavate (stage 1)5. Wale/blocking/tieback

anchor6. Repeat steps 4 & 5/

Excavate to final subgrade

6.

6.

6.

Design Concept I:Why not used?

1. Stand‐off frame would interfere with the future structure

2. 90 West did not allow tieback anchors below their building

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Design Concept II: T‐Panels

• Construct T-Panels/ first segment of buttress wall with tiedownsleeves


Existing high rise structures with one Basement level supported on piles

Panel joint shear connection

Stem

FlangeTiedownSleeves

Design Concept II: Secondary Panels



• Construct Secondary panels between T-Panels

Secondary panels

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D

D

Design Concept II: Buttress Panels

• Construct Buttress Panels with Caissons Sleeves

Panel Joint Shear Connection

Caisson Sleeves

Design Concept II: Section D ‐ D

Construction Sequence1. Guide Wall

1.

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Construction Sequence1. Guide Wall2. T‐Panel

2.


Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel

3.

Perm

anent

Temporary

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Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor

4.

High Tension Resistance


Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor5. Caissons

5.

High Shear Resistance

High Compressive Resistance

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Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor5. Caissons6. Excavate (stage 1)

6.


Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor5. Caissons6. Excavate (stage 1)7. Wale/Raker

7.

7.

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Design Concept II: 3D – Wale & Raker

Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor5. Caissons6. Excavate (stage 1)7. Wale/Raker8. Excavate (stage 2)


8.

Embedded Plate for Truss Connection.

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Construction Sequence1. Guide Wall2. T‐Panel3. Buttress Panel4. Tie‐down Anchor5. Caissons6. Excavate (stage 1)7. Wale/Raker8. Excavate (stage 2)9. Truss between

buttresses


9.


buttresses10.Repeat steps 8 and 9/

Excavate to finalsubgrade


Detail

10.

10.

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3D Model: Buttress supported slurry wall


buttresses10.Repeat steps 8 and 9/

Excavate to finalsubgrade


Detail

10.

10.

Detail

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Panel Joint Continuity: Shear across joint

Construction Sequence1. Trenching (T‐panel)

1.

Excavated slurry filled trench Unexcavated


Construction Sequence1. Trenching (T‐panel)2. Panel joint connector

2.

W‐Section

Hooked‐welded reinforcing bars

Removable gate

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Construction Sequence1. Trenching (T‐panel)2. Panel joint connector3. Reinforcing Cage

3.


Construction Sequence1. Trenching (T‐panel)2. Panel joint connector3. Reinforcing Cage4. Tremie Pour T‐panel

4.

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Construction Sequence1. Trenching (T‐panel)2. Panel joint connector3. Reinforcing Cage4. Tremie Pour T‐panel5. Trenching (Buttress panel)

5.


Construction Sequence1. Trenching (T‐panel) 6. Lift gate2. Panel joint connector3. Reinforcing Cage4. Tremie Pour T‐panel5. Trenching (Buttress panel)

6.

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Construction Sequence1. Trenching (T‐panel) 6. Lift gate2. Panel joint connector 7. Reinforcing Cage3. Reinforcing Cage4. Tremie Pour T‐panel5. Trenching (Buttress panel)

7.


Construction Sequence1. Trenching (T‐panel) 6. Lift gate2. Panel joint connector 7. Reinforcing Cage3. Reinforcing Cage 8. Tremie Pour buttress4. Tremie Pour T‐panel5. Trenching (Buttress panel)

8.

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3D: Finite Element Analysis – Risa 3D

Back‐calculated from observed wall deformations

Tamaro and Cermak (2004)

Finite Element Analysis: Soil Parameters

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3D: Finite Element Analysis – Plaxis 3D

1. Plaxis 3D Foundation2. 15‐node wedge element3. Number of elements: 119044. Soil Layers: Hardening Soil Model

3D: Finite Element Analysis – Plaxis 3D

Buttress

Raker

Wale

Tiedowns

OriginalWallPosition

1 in.

Truss

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Performance: Instrumentation Plan

Inclinometer in Slurry Wall

Performance: Inclinometer IPI‐11

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3D Finite Element Analysis


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3D Finite Element Analysis

Summary:

1.Conventional tieback anchors could not be used.

2.Buttress walls, an innovative earth retaining solution, were implemented successfully –with no damage to the adjacent structures.

3.The estimated wall deformations match the field measured data. Back‐calculated soil parameters were the key for the reasonable estimation.

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Photo: Looking East

Photo: Looking South

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Photo: Looking South

Photo: Looking East

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3D Model: Buttress supported slurry wall

Questions?

06 Fantaye PPT muros colados

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