recent supertall concrete towers in the middle east · jeddah tower jeddah saudi arabia 1000m burj...
TRANSCRIPT
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RECENT SUPERTALL CONCRETE
TOWERS IN THE MIDDLE EASTJohn Peronto and Robert Sinn
11th International Workshop
on Structural Concrete
October 19, 2019
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Uptown Dubai – Site of Supertalls
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Uptown Dubai – Site of Supertalls
711m Supertall Tower and Structural System
Concrete Material
a. Strength (f’c)
b. Modulus (MOE)
c. Local Challenges
Wind Tunnel Testing
Site Challenges and Wake Buffeting
Performance
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• Concrete Core
• Concrete Mega-Columns
• Steel Outriggers
(3 – Stories Deep)
• Concrete Belt Wall
(2 – Stories Deep)
• Concrete Secondary
Columns
• Concrete Floor Framing
Structural System
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High-Strength Concrete Data
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Floor Framing – Concrete vs Steel
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Floor Framing – Flat Slab Analysis
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Mega-Column Design
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Concrete Core with Mega-Column and Outrigger Schemes
Structural System
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Outriggers and Seismic Overstrength
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Outrigger MEP Coordination
Section per ASGG sketch
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Footprint Comparison
Uptown Dubai T1– Floor Plan Jeddah Tower – Floor Plan
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Footprint Comparison
Uptown Dubai T1 and Jeddah Tower – Floor Plan Overlay
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Wind Tunnel Testing - RWDI
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Images per RWDI report (Figure 6a)
Initial HFFB Wind Tunnel Test Response
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Images per RWDI report (Figure 6a)
Aeroelastic Wind Tunnel Test Refined Response
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Tower 2 (340m) – WAKE BUFFETING !!
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Tower 2 (340m) – WAKE BUFFETING !!Results
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Phase 1 - Construction Progress (Raft)
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Phase 1 - Construction Progress (Tower Rising)
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Jeddah Tower – 1st 1km Tall Structure
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Name
City
Country
Height
Jeddah Tower
Jeddah
Saudi Arabia
1000m
Burj Khalifa
Dubai
United Arab Emirates
828m
Shanghai Tower
Shanghai SH
China
632m
Taipei 101
Taipei
Taiwan
508m
Petronas Towers
Kuala Lumpur
Malaysia
452m
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Team/Code Recap
Structural Engineer:
Architect:
Developer
Competition Start :
Complete Design Docs:
Reinforced Concrete:
General Contractor:
Employers Engineer:
Thornton Tomasetti (TT)
Adrian Smith + Gordon Gill
Architecture (AS+GG)
Jeddah Economic Company
(JEC)
June 2009
August 2013
Design to ACI 318
Saudi BinLaden Group (SBG)
Dar Al-Handasah
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Structural System
- All walls connected with link beams
- No columns
- No outriggers
- No column transfers
- Flat plate floors
- No spandrel beams
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High Strength Concrete and Reinforcing Bar Materials
Vertical Concrete (f’c)
Rebar Cylinder
65 MPa
9,500 psi
75 MPa
11,000 psi
85 MPa
12,500 psi
520 MPa75 ksi
60 MPa /
9,000 psi
420 MPa
60 KSI
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85 MPa Concrete Spec
f’c =85 MPa (12,3000 psi) at 90d
MOE =43.3 GPa (6300 ksi) at 90d
Mix: Near SCC
Water/Cementitious Ratio 0.25
Density 156 pcf
OPC 696 lb
SF 76 lb
PFA 170 lb
3/8” CA 1580 lb (Medina)
Fine Agg 1245 lb
Water/Ice 235 lb
HRWR Polycarboxylate
VMA
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High Strength Concrete – Site Testing for f’c
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High Strength Concrete – Site Testing for MOE
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Bayesian Statistical Analysis
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Kingdom Tower
*PreConstruction Testing Program
*Full Construction Concrete Testing Program
- Modulus
- Strength
- Creep
*Surveying/Monitoring Requirements
*Reporting
*Compensation Instructions
- Vertical
- Horizontal
*Assumed Sequence of Construction
Construction Guidelines & Monitoring
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Kingdom Tower-Staging Assumptions
Representative Stages – Construction Sequence
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Results – Kingdom Tower
Effect of Creep & Shrinkage
may redistribute load over time
Wall Stress vs. Time
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Horizontal Displacement
Results – Kingdom Tower
At End of Construction At 10 Years
Static (ETABS)
Staged (Midas)
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Construction – January 2014
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Construction – February 2014
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Mat Concrete
f’c= 60 MPa (8,7000 psi) at 56d
MOE = No requirement
Mix: Self-Consolidating Concrete
Portland C
SF
PFA
1/2,3/8” CA
Fine Agg
Water/Ice
HRWR
VMA
454 lb
66 lb
305 lb
1440 lb (Mecca)
1390 lb
250 lb
Polycarboxylate
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Mat Foundation – Steel Fixing
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Tower Mat Formwork
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Tower Mat Concrete Pour
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Mat Foundation – Insulation / Curing
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Construction Progress
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Sequence of Construction
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Wing/Corridor Wall Formwork
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October 2019
Progress:
Height 265m
Exterior Wall
Installation
Commenced
First Column
Setback
Reached
~40% Concrete
placed