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8/8/2019 Yuksek Katli Bina Tasarimi
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Columbus Center
East
Kegan International
10 December 2010
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Columbus Center Project10 December 2010
Agenda
I. Introduction to Kegan
II. Overview - Columbus Center Project
III. Conceptual DesignIV. Focus
I. High Rise Building The Tripod
II. Retail Center The Arch
V. Concluding Remarks
I. Costs and Benefits
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Columbus Center Project10 December 2010
Kegan International
Project Members:
Jason COOK, Project Manager
Aurelie BLE, Structural Engineer
Sinan KETEN, Structural Engineer
Miriam SON, Architectural Engineer
Goldie KATZOFF, Construction Engineer
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Columbus Center
Project
Overview
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Columbus Center Project10 December 2010
Columbus Center Project
Overview
Develop air rights spanning theMassachusetts Turnpike, I-90
Utilize the fragmented, small plots nearthe turnpike for structural supports
Create social and economical value forSouth End
Maintain financial appeal to investors
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Columbus Center Project10 December 2010
Columbus Center Project
Site Location
Downtown
Boston, MA
North Tipof the
South End
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Columbus Center Project
Site Layout
16 17 18 19
Parcel 16: 101 Clarendon StreetParking structure to service new
development
Parcel 17: 100 Berkeley StreetHigh rise building with office and
residential space
Parcel 18: 171 Arlington StreetArch structure for retail shopping
Parcel 19: N/AUrban park environment
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Columbus Center Project10 December 2010
Columbus Center Project
Conceptual Design
Parcel 16-Parking Garage
Cantilever Structure
Design A: Concrete Segmental bridge idea
Pre-stressed & lightweight
Design B: Steel
Multi-story steel truss Prefabricate & install
1
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Columbus Center Project10 December 2010
High Rise Conceptual Design
Conceptual Design
Parcel 17-High Rise
Design A: Tripod
Longest span at base Inherent lateral stability
Intriguing architecture
Design B: Hanging
Efficient use of material Column-free at grade
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Columbus Center Project10 December 2010
Columbus Center Project
Conceptual Design
Parcel 18-Retail Center
Design A: Arched Gravity Structure
Quick and easy erection
Design B: Arched Hanging Structure
Lighter structure
Less expensive
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Columbus Center Project10 December 2010
Columbus Center Project
Conceptual Design
Parcel 19-Park
Design: Hanging Platform
Concrete slab supported by3 piles
Overturning momentprevented by trussedbracing
Additional stability providedby cables
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Columbus Center Project10 December 2010
Columbus Center Project
Selected Focus
Parcel 17
The High Rise
Tripod Hanging
Parcel 18
The Arch
Hanging
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Design OverviewThe High Rise
Design OverviewStructural System
Constructability
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High Rise Design OverviewFinal Design
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Columbus Center Project10 December 2010
High Rise Design Overview
Properties
Combination of Schemes Tripod main structure
Hanging floors
Traditional gravity supportedtop section
Structure Dimensions 57 stories, 720 ft tall
300 ft clear span at grade 60 ft minimum at intersection
135 ft span at top
700,000 sq. ft of floor space
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Structural SystemThe High Rise
Design OverviewStructural System
Constructability
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Columbus Center Project10 December 2010
High Rise Structural System
Overview
Main Structure
Crown
Core
Load Transfer
Foundation
Structural Analysis
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Columbus Center Project10 December 2010
High Rise Structural System
Main Structure
Main Structure
Exterior Columns
Tension Members
Floor Framing
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Exterior Columns
Function
Carries loads to ground Provides inherent lateral
stability and stiffness
Description
Triangular cross-section 76 degrees incline
Bottom to top tapering
High Rise Structural System
Main Structure
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Columbus Center Project10 December 2010
Exterior Columns
Materials
Two concentric built up steeltriangles
Concrete encased intriangular steel sections
Center kept hollow
Lowers weight
Avoids mass concrete heatdissipation problems
Increases moment of inertia
High Rise Structural System
Main Structure
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Columbus Center Project10 December 2010
Exterior Columns
Dimensions
Size determined byproportion of building
Appears robust andcommunicates stability
Bottom: 15 ft side
Top: 5 ft side
High Rise Structural System
Main Structure
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Columbus Center Project10 December 2010
Tension Members
Function
Carries floor loadsup to exteriormega-columns
High Rise Structural System
Main Structure
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Tension Members
Description
Exterior members Solid steel rods
Placed at every five floors
Connected at floor-column intersection rather
than keeping angleconsistent
High Rise Structural System
Main Structure
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Columbus Center Project10 December 2010
Tension Members
Description
Interior members Solid steel rods
Each member carriesloads of varying number offloors
High Rise Structural System
Main Structure
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Tension Members
Geometry
Exteriormembers sizedaccording to load
Interior membersplaced for
constant radius
High Rise Structural System
Main Structure
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Floor Framing
Overview
First floor mostcritical
Large spans
High Rise Structural System
Main Structure
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Floor Framing
Layout
Typical simple spanframes
Reduced unbracedlength, 8 ft on centerspacing
Corrugated metaldecking with one wayslabs
High Rise Structural System
Main Structure
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Floor Framing
SAP Analysis
Floor framing Member sizing
Check for strength
Check for deflection
High Rise Structural System
Main Structure
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High Rise Structural System
Main Structure
Floor Framing
SAP analysis
Deformed Shape
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Deformed Shape
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High Rise Structural System
The Crown
The Crown
Hat Truss
Mega-Columns
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High Rise Structural System
The Crown
Hat Truss
Structure
Exterior steel truss on3 faces
W14 columns andchords, HSS diagonals
Interior truss for spanloads, lateral stability
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High Rise Structural System
The Crown
Mega-Columns
Function
Carries gravity loads tothe transition intersection
Provides lateralresistance
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High Rise Structural System
The Crown
Mega Columns
Structure
Same scheme as mainstructure
Gravity loads distributedto transfer system
Slabs and floor framinghelps lateral stability
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High Rise Structural System
The Core
The Core
Function
Configuration
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High Rise Structural System
The Core
Function
Access to floors
Resistance to inter-story drift
Support for floorframing
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High Rise Structural System
The Core
Configuration Braced steel truss
Main structure Hung from transition
intersection
Larger triangle area
Crown Supported by transition
intersection
Smaller rectangulararea
Mainstructure
Crownstructure
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Columbus Center Project10 December 2010
High Rise Structural System
Load Transfer
Load Transfer
Main Structure Crown
Transition Tension Member -
Column/Girder Connection
Exterior members
Interior members
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High Rise Structural System
Load Transfer
Main Structure Crown Transition
Function Point of intersection
of the main structureand crown
Distributes loads tomain structurecolumns
Provides bendingrigidity
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High Rise Structural System
Load Transfer
Main Structure Crown Transition
Behavior Exterior mega-
truss diagonals forload transfer
Interior core forresisting bendingand drift
Floor framing forlateral stability
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High Rise Structural System
Load Transfer
Tension Member - Column/GirderConnections
Description Exterior connections
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High Rise Structural System
Load Transfer
Tension Member - Column/GirderConnections
Description Interior connections
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Columbus Center Project10 December 2010
High Rise Structural System
Load Transfer
Tension Member - Column/GirderConnections
Design considerations Typical connections
Double shear planes
Stiffeners
Hidden connections
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High Rise Structural System
Load Transfer
Tension Member - Column/GirderConnections
On-site considerations Prefabricated welds
Accessibility of connections
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High Rise Structural System
Structural Analysis
Structural Analysis
Main Structural Skeleton
Create geometry Dead, live and wind load combinations
Rigid floor assumption diaphragm
Find max forces on mega- columns
Core member sizing
Structural dynamics
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High Rise Structural System
Structural Analysis
Structural Analysis
SAP Model of Main Structural Skeleton
Deformed shape Torsion mode
Sway mode
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Deformed Shape
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Fundamental Mode
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Second Mode
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High Rise Structural System
Foundation
Foundation Considerations
Loads
Local Soil Structure Foundation for Each Column
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Columbus Center Project10 December 2010
Loads
3 mega-columns
30,000 kips each Local Soil Structure
Organic deposits to -20 ft
Marine deposits to -105 ft
Bedrock at 105 ft
High Rise Structural System
Foundation
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Columbus Center Project10 December 2010
High Rise Structural System
Foundation
Foundation forEach Column
(6) 4-ft diametercaissons underpile cap
Rock socket
length: 57 ft Caisson capacity:
5,270 kips
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ConstructabilityThe High Rise
Design ConceptsStructural Details
Constructability
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High Rise Constructability
Overview
Sequence
Schedule Projected construction
GANTT chart
Special Considerations
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Columbus Center Project10 December 2010
High Rise Constructability
Sequence
STAGE 1: Foundation
Clear site
Foundation
Drill
Caissons
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High Rise Constructability
Sequence
STAGE 2: Column Construction
Stable under their own weightand wind loading up to height
of 300 ft
Transport prefabricated steelsections
Progressively fill with concrete
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Columbus Center Project10 December 2010
High Rise Constructability
Sequence
STAGE 2: Column Construction
Erect a temporary bracingsystem at 252 ft
Provides lateral stability andstiffness
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High Rise Constructability
Sequence
STAGE 2: Column Construction
Continue construction
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High Rise Constructability
Sequence
STAGE 2: Column Construction
Erect a 2nd temporary bracingsystem at 450 ft
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High Rise Constructability
Sequence
STAGE 2: Column Construction
At 540 ft, reach transitionintersection
Inherent stiffness of tripodstructure goes into effect ascolumns meet and connectionconstructed
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High Rise Constructability
Sequence
STAGE 3: Core, Rods, Flooring, Frame
Begin construction of core
Trailing the downward construction
of the core
Affix tension rods
Put in floors
Remove temporary bracing
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Columbus Center Project10 December 2010
High Rise Constructability
Sequence
STAGE 3: Core, Rods, Flooring, Frame
Begin construction on the crown,building upwards, at 252 ft
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Columbus Center Project10 December 2010
High Rise Constructability
Sequence
Sequence
STAGE 3: Core, Rods, Flooring, Frame
Continue with simultaneousconstruction
Building downwards on main
structure
Building upwards on crown
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High Rise Constructability
Sequence
Sequence
STAGE 3: Core, Rods, Flooring, Frame
Complete framing
Construction of hat truss
Construction of roof
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High Rise Constructability
Sequence
Sequence
STAGE 4: Finishing
Timing overlaps with stage 3 Begin after the start of core
construction (Start-Start relationship)
Mechanical system
Faade
Interior finishing
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High Rise Constructability
Special Considerations Mass Pike Related
Minimal highway closures
Build high rise from columns up
Utilization of climbing cranesthroughout
Safety considerations
Install safety net
Weary motorist
Provide screen to block their viewof construction
http://www.nps.gov/jeff/arch-const.htm
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High Rise Constructability
Special Considerations
On-site Storage Issues
Land surrounding columns can be used forimmediate storage
Parcel 16 can be taken advantage of to storematerials for as long as construction ofparking structure has not yet begun
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Design OverviewThe Arch
Design OverviewStructural System
Constructability
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Total Area:
222,500 ft2
Land:21,900 ft2
Parcel 18: Retail Structure
Arch Site
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Structural SystemThe Arch
Design OverviewStructural System
Constructability
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Arch Design Hanging Structure
Arch Structural System
Overview
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Maximal high : 71.76 ftInitial incline : 45
Arch Structural System
Optimal Shape Determination
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Concrete slabs 8 in thick
Double glazed glass roof 1 in thick
Steel frame
Arches and beams:
W section members Columns: Plain steel
tension member
Foundation LBE: concrete
Tied arch: plain steel
tension member
Arch Structural System
Materials and Description
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Ensure stability betweentwo arches
Carry roof loads of the
double glazed glass
52.80 ft wide and 4.92 ft high
W sections : W8x24
W8x10
Arch Structural System
Longitudinal Beam Description
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Tied arch:4in radius horizontal tensionmember
Soil nature:Organic Deposits until -20ftMarine Deposit until -100ftBedrock beyond -100ft
Foundations:LBE 4x9 ft at each end of the 14archesRock Socket length = 115 ft
Arch Structural System
Foundations
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ConstructabilityThe Arch
Design ConceptsStructural Details
Constructability
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Arch Constructability
Sequence STAGE 1: Foundation
Clear site
Drill
Caissons Arch Tie
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Arch Constructability
Sequence STAGE 2: Arch Erection
Off-site fabrication of segments
Truck-in and raise into place during
early morning hours Y-support, fixed at the center of the
highway to provide temporary support
Put up first two
arches concurrently
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Arch Constructability
Sequence STAGE 4: Tension Members
Put tension members into place
Pouring the first floor
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Arch Constructability
Sequence STAGE 6: Finishing Touches
Roof
Faade
Mechanical system Interior
Etc.
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Arch Constructability
Sequence Projected Time: 28 months
Start: June 2, 2008 End: October 25, 2010
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Arch Constructability
Special Considerations
Considerations similar to high-rise
Exceptions
Highway closures in early morning hoursduring stage 1 of construction
Lifting members into place
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Concluding RemarksCosts & Benefits
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Costs & Benefits-The High Rise
Costs of the High Rise Structure
Gross estimate: $225,968,000
Material & construction costs: $82,000,000
Concrete: 17,000 CY @ $988/CY
Steel: 25,000 tons @ 2575/ton
Mechanical & electrical: $30,984,000
Difficulty factor scale: 2
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Costs and Benefits- The Arch
Cost of the Arch Structure
Gross estimate: $101,425,000
Material & construction costs: $91,000,000
Concrete: 19,000 cy @ $988/cy
Steel: 28,150 tons @ 2575/ton
Mechanical & electrical: $10,425,000
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Cost & Benefits
Benefits
The tripod high rise
Redefines the Boston skyline
Prime office space Penthouse rentals with magnificent views
The arch structure
Profitable retail space
Idea location near the high rise Brings life to the South End
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Thank You!
Go raibh mle maith agait!Merci!
Teekkrler!
Grazie!Gracias!
)YGEVMWXZ