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The modular, Y-shaped structure, with setbacks along each of its three wings, provides an inherently stable configuration for the structure and provides good floor plates for residential. In just 1,325 days since excavation work started in January, 2004, Burj Khalifa became the tallest free-standing structure in the world. Burj Khalifa's construction will have used 330,000 m3 (431,600 cu yd) of concrete and 39,000 tonnes (43,000 ST; 38,000 LT) of steel rebar, and construction will have taken 22 million man-hours. Due to the aggressive conditions present caused by the extremely corrosive ground water, a rigorous program of anti-corrosion measures was required to ensure the durability of the foundations. Each wing, with its own high performance concrete corridor walls and perimeter columns, buttresses the others via a six-sided central core, or hexagonal hub. Ontario (Figure 14). Structural System The Spiraling Y shaped was utilized shape the structural core of the Burj Khalifa. Burj Khalifa has got a hexagonal concrete core with an innovative system of Y-shaped buttresses which has been incorporated to give this building a stable and unique “tripod like” stance. The wall and column sizes were optimized using virtual work .' The exterior cladding of Burj Khalifa began in May 2007 and was completed in September 2009. When the rebar cage was placed in the piles, special attention was paid to orient the rebar cage such that the raft bottom rebar could be threaded through the numerous pile rebar cages without interruption, which greatly simplified the raft construction. This enabled construction to proceed without the normal delays associated with column transfers. The solid reinforced concrete raft is 3.7 meters (12 ft) thick and was poured utilizing C50 (cube strength) self consolidating concrete (SCC). Burj Khalifa (Arabic: برج خليفة , "Khalifa Tower") is an extremely tall skyscraper in Dubai, United Arab Emirates named after Khalifa bin Zayed Al Nahyan, and is the tallest building ever built, at 828 metres (2,717 feet).Before the building opened, it was called Burj Dubai.The building is 162 stories high. Similar to Burj Khalifa, as each wing is buttressed by the other two, therefore, the stability of the structure is greatly enhanced. of the tower structural systems, focuses on the key issues considered in construction planning of the key structural components and briefly outlines the execution of one of the most comprehensive architectural forms and structural in tall buildings. The structural system employed for Burj Khalifa can be called as the Buttressed Core System. To be precise, burj khalifa has no damping system like a tuned mass damper or so. Other names the building has commonly been known as, including former names, common informal names, local names, etc. Due to its tubular system, proportionally only half the amount of steel was used in the construction, compared to the Empire State Building. The architecture features a triple-lobed footprint, an abstraction of the Hymenocallis flower. Structural System The Spiraling Y shaped was utilized shape the structural core of the Burj Khalifa. Wind Engineering Design The 280,000-square-meter skyscraper contains office, residential, and retail space, along with a Giorgio Armani hotel. The spire was constructed from inside the building and jacked to its full height of over 200 metres using a hydraulic pump. Burj Khalifa is equivalent to 17 football (soccer) fields or 25 American football fields. The massing of the 828-meter (2,717-foot) tall Burj Khalifa is organized around a central core with three wings, each consisting of four bays (see Figure 2). Burj Khalifa has redefined what is possible in the design and engineering of supertall buildings. An extensive program of wind tunnel tests and other studies were undertaken under the direction of Dr. Peter Irwin of Rowan Williams Davies and Irwin Inc.'s (RWD1) boundary* layer wind tunnels in Guelph. 2. Burj Khalifa – Structural Engineering. The second mode is a perpendicular lateral side sway with a period of 10.2 seconds. Search this site. Structural System Brief Description 2.1. The spire was constructed from inside the building and jacked to its full height of over 200 metres using a hydraulic pump. High performance concrete with high compressive strength SOM created a simple Y-shaped plan to reduce wind forces, as well as to foster constructability. The exterior exposed steel is protected with a flame applied aluminum finish. The full 3D analysis model consisted of over 73,500 shells and 75,000 nodes. The C60 (cube strength) SCC concrete was placed by the tremie method utilizing polymer slurry. Burj Khalifa is home to 57 elevators and 8 escalators the building service/fireman’s elevator have a capacity of 5,500 kg and is the world’s tallest service elevator. The concrete mix for the piles was a 60 MPa mix based on a triple blend with 25% fly ash, 7% silica fume, and a water to cement ratio of 0.32. Structural monitoring of Burj Khalifa Tower. Local aggregates were utilized for the concrete mix design. The piles are 1.5 meter in diameter and approximately 43 meters long with a design capacity of 3,000 tonnes each. It consists of series high-strength reinforced concrete walls: a strong central core is connected to three building wings. This design helps to reduce the wind forces on the Its 160 floors have a number of uses including residential units, office spaces and hotel rooms. Structural System In addition to its aesthetic and functional advantages, the spiraling “Y” shaped plan was utilized to shape the structural core of Burj Khalifa. By combining cutting-edge technologies and cultural influences, the building serves as a global icon that is both a model for future urban centers and speaks to the global movement towards compact, livable urban areas. An image of the Burj Khalifa is shown in Figure 1. Its reinforced concrete structure makes it stronger than steel-frame skyscrapers. Construction of the tower was started in 2004. The potential for liquefaction was investigated based on several accepted methods; it was determined that liquefaction is not considered to have any structural implications for the deep seated Tower foundations. The structure of Burj Khalifa was designed to behave like a giant column with cross sectional shape that is a reflection of the building massing and profile. Each wing, with its own high-performance concrete core and perimeter columns, buttresses the others via a six-sided central core, or hexagonal hub. These include a “sky-sourced” ventilation system, in which cool, less humid air is drawn in through the top of the building. The tower is composed of three elements arranged around a central core. The spire was constructed from inside the building and jacked to its full height of over 200 metres (700 feet) using a hydraulic pump. Since the shrinkage in concrete occurs more quickly in thinner walls or columns, the perimeter column thickness of 600mm (24") matched the typical corridor wall thickness (similar volume to surface ratios) (Figure 5) to ensure the columns and walls will generally shorten at the same rate due to concrete shrinkage. An image of the Burj Khalifa is shown in Figure 1. Each raft pour occurred over at least a 24 hour period. 3.22 shows a typical floor plan of the tower, a buttress core system was used as the major structural system for this supertall tower. The groundwater in which the Burj Dubai substructure is constructed is particularly severe, with chloride concentrations of up to 4.5%, and sulfates of up to 0.6%. It consists of series high-strength reinforced concrete walls: a strong central core is connected to three building wings. The Burj Khalifa Project is the tallest structure ever built by man; the tower is 828 meters tall and compromise of 162 floors above grade and 3 basement levels. Khan's contributions to the design of tall buildings have had a profound impact on architecture and engineering. Market: Commercial + Office, Hospitality, Mixed Use, Residential, National Geographic Features Burj Khalifa and William Baker in Engineering Marvels Series, The Man Behind the Wonders – Bill Baker Reveals the Secrets of Structural Engineering, William F. Baker in The Engineers on BBC World Service, Structural Engineers Association of Illinois, American Society of Civil Engineers (ASCE) – Architectural Engineering Institute (AEI), Award of Merit: World Voices Sculpture, Burj Khalifa Lobby, GCC Technical Building Project of the Year, International Association for Bridge and Structural Engineering, Excellence in Structural Engineering: Most Innovative Structure, International Projects Category: Outstanding Project, National Council of Structural Engineers Association, Special Recognition for Technological Advancement, 875 North Michigan Avenue – Structural Engineering, Willis Tower (formerly Sears Tower) – Structural Engineering, Poly Real Estate Headquarters – Structural Engineering, Poly Corporation Headquarters – Structural Engineering. Supported raft 1 October 2009 Khalifa began in May 2007 burj khalifa structural system was completed in 2009... 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