structural system of the Burj Khalifa acts like a single unit creating a tower that acts as one giant concrete beam cantilevering from the ground. 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. The 280,000 m2 (3,000,000 ft2) reinforced concrete multi-use Burj Dubai tower is utilized for retail, a Giorgio Armani Hotel, residential and office. The decision to build Burj Khalifa was based on the government’s decision to diversify from an oil-based Each wing buttresses the other through a hexagonal central core as shown in figure-2. The structural system employed for Burj Khalifa can be called as the Buttressed Core System. This design helps to reduce the wind forces on the The top section of the Tower consists of a structural steel spire utilizing a diagonally braced lateral system. To reduce the effects of differential column shortening, due to creep, between the perimeter columns and interior walls, the perimeter columns were sized such that the self-weight gravity stress on the perimeter columns matched the stress on the interior corridor walls. After getting information directly of the website about the construction of Burj Khalifa, we were able to understand more about the structural system within the building. The spire was constructed from inside the building and jacked to its full height of over 200 metres using a hydraulic pump. The site geotechnical investigation consisted of the following Phases: A detailed 3D foundation settlement analysis was carried out (by Hyder Consulting Ltd., UK) based on the results of the geotechnical investigation and the pile load test results. The architecture features a triple-lobed footprint, an abstraction of the Hymenocallis flower. At each setback, the building's width changes. Construction of the tower was started in 2004. Burj Khalifa in Dubai. Other Names. 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). The “Y” shaped plan also provided a stable platform on which to base the development of a new “buttressed core” structural system specially developed to support a building of this height while maintaining the tower’s slender and elegant shape. At the pinnacle, the central core emerges and is sculpted to form a spire. Wind tunnel models account for the cross wind effects of wind induced vortex shedding on the building. It was determined the maximum long-term settlement over time would be about a maximum of 80mm (3.1"). The superstructure has reached over 165 stories. 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. In structural engineering, the tube is a system where, to resist lateral loads (wind, seismic, impact), a building is designed to act like a hollow cylinder, cantilevered perpendicular to the ground. The C80 concrete for the lower portion of the structure had a specified Young's Elastic Modulus of 43,800 N/mm2 (6,350ksi) at 90 days. Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. Its 160 floors have a number of uses including residential units, office spaces and hotel rooms. The spiraling “Y” shaped plan was used to reinforce the structural core of Burj Khalifa. The setbacks are organized with the Tower's grid, such that the building stepping is accomplished by aligning columns above with walls below to provide a smooth load path. 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