Burj khalifa
•
12 likes•2,714 views
Structural Design aspects of Burj Khalifa. All important information that you may need to know about the worlds tallest building. Burj Khalifa model was analysed on ETABS and on Midas gen 2010. Midas was used for Column shortening and stage construction analysis.
Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (12)
Similar to Burj khalifa
Similar to Burj khalifa (20)
More from Rishabh Lala
More from Rishabh Lala (12)
Recently uploaded
Recently uploaded (20)
Burj khalifa
- 1. Burj Khalifa Report by Rishabh Lala
- 2. Well Known Facts • Specialty : Tallest Building • Height : 828 meters • Floors : 162 Floors • Time : 6 Years • Completed in: 2010 • Steel : 30 K Tons • Concrete : 250 K CUM
- 3. Well Known Facts • Accommodation :35 K People • Elevators : 57 • Escalators : 8 • Elevators Speed : 35 km/h • Biggest Elevator : 46 People at Once • Service Elevator : Worlds Tallest • Water Heating : Solar = 32 K KWH • Refuge Rooms : one in 30 Floors
- 4. Structural Facts • Designer : SOM Group • Buttressed Core : Hexagonal Hub • Concrete : C60-C80, with Fly Ash • Y Shaped Plan : To reduce wind effect • Each Wing has : High performance Walls : and Perimeter Columns : with Central (Hexagon) Core • Result : Extremely stiff tower
- 6. Structural Facts • Confuse the Wind : Vortices never organize • Reason : At Each Setback, building • : Building Width Changes • Hexagonal : • Wing Walls : Act as webs and flanges • Hammerhead Walls : of a Beam • Wall Concrete : C60 –C80 • Optimization : Virtual Work and Lagrange : Multiplier Methodology
- 7. • Setback
- 8. Structural Facts • Differential Column Shortening : Least Affected • 5 Outrigger Truss Sets : Ensure stress Distribution • Tower Top : Structural Steel Spire • Analysis (Gravity, Wind, P Delta): Etabs version 8.4 • 3 D Model : RCC Walls, Slabs, Beams, raft, Piles, and the spire steel system • Shells and Nodes : 73500 Shells, and 75 K nodes • Natural Period (I,II and V) : 11.3 s, 10.2 s, 4.3 s • Zone (as per DM ) : UBC 97 Zone 2a with Z = 0.15 • Soil Profile : Sc
- 9. Mode 1 : 11.3 Seconds Mode 2 : 10.2 Seconds Mode 5 : 4.3 Seconds
- 10. Foundation • Foundation : Pile Supported Raft • Raft : 12 feet or 3.7 m thick • 4 Pours (Parts) : 3 wings and 1 core • Concrete : C50 (50 MPa) • Type : Self Consolidating • Fly ash : 40% with W/C =0.34 • Test Cubes : 3.7 m thick • Purpose : Thermal Check • Piles : 194 Bored Cast in- Situ
- 11. • Mega Raft Cubes
- 12. Piles • Diameter : 1.5 Meter • Length : 43 Meter • Design Capacity : 3000 Tonnes • Pile Load Test : 6,000 Tonnes • Cube Strength : C60 (60 MPa) • Friction Piles Support: Cemented Calcisiltite • Skin Friction : 250 to 350 tons/sq feet
- 13. Wind Engineering • Wind Tunnel • Studies Conducted by RWDI
- 14. • Vortex Shedding • High-frequency-force-balance tunnel tests
- 15. • 6 Wind Directions • Aero-Elastic Models were Initiated by the End
- 16. Construction Sequence • Conventional Approach • But as Building height increases: The results will diverge from actual behavior • Time Dependent Approach: Creep, Shrinkage, Sequential Loading • Burj Khalifa : 15 Separate FEM • Time Steps : 50 Years After Construction Actual Concrete Behaviour • MIDAS Gen 2010
- 17. Compensation Method • Horizontal • Vertical
- 18. Issues • Rock at 50 m was fragile and saturated with Ground Water • Solution: • 194 Piles Constructed • Viscous Polymer Slurry
- 19. • Owner: • Project Manager: • • Architect/Structural Engineers/: • Adopting Architect & Engineer/Field Supervision: • Independent Verification and Testing Agency: • General Contractor: • Foundation Contractor: • Emaar Properties PJSC • Turner Construction International • Skidmore, Owings & Merrill LLP • Hyder Consulting Ltd. • GHD Global Pty. Ltd. • Samsung/BeSix/Arabtec • NASA Multiplex
Editor's Notes
- C-60 and C-80 are in ___ Codes having ____ Strength Water Heating : 378 Panels with 2.7 sqmeter area each
- Buttressed Core : greater building height : also called Hexagonal Hub REFUGE ROOMS : RESIST HEAT UPTO 2 HOURS, MADE OF RCC, AND FIRE PROOF SHEETS, TO ENSURE EVACUATION IN CASE OF ANOTHER 9/11- TOTAL 9
- Wind: Vortices never get formed as wind encounters different shape at every tier Wall Concrete : C80 for Lower Floors
- Walls and Column sizes are kept such that self weight gravity “stresses” on them are equal This reduces differential settlement Outrigger Truss : allows all elements to participate in lateral load resisting ensuring highest efficiency Spire is made of 4000 tons of structural steel, which also houses communication equipments Although, Burj Khalifa is tallest because of this spire only, it was originally designed to resist gravity, wind, seismic and fatique in accordance with AISC Load Specifications for structural steel Building 1999. Although, Gravity Loading(seismic) was not the design criteria. Several Tests were conducted to ensure that there wont be any liquefaction phenomena in soil
- First two modes were Purely Translational Modes And the fifth mode was the first torsional mode having 4.3 seconds
- Giant test cubes
- Induced Vortex Shedding Was Estimated by Wind Tunnel Test RWDI – Rowan Williams Davis Incorporation
- High Frequency Force Balance Technique was employed, to get the tentative shape of the tower for analysis Then final shape of the tower was decided, based on the relative stiffness of all the floors
- An aero-elastic model has same flexibility as that of the original building, in terms of stiffness, mass and damping. This was done to analyze the effects of several higher modes of vibration and it was found that the motions are within ISO Limits, and secondary damping is not needed.
- Conventional Approach is : Considering the building as linearly elastic model and all forces are applied at once as summation of forces
- Vertically: Modest increase in the floor to floor height so that it attains its actual height after time dependent effects Horizontal : Recentring : to correct “Gravity induced Side Sway like – differential foundation settlement, creep, shrinkage shifting”
- Piles Constructed to avoid Sinking Viscous Polymer Slurry to fill up the holes: when concrete was poured in, the slurry was displaced
- Agencie Involved in the project