PowerPoint Presentation
STRUCTURAL ANALYSIS OF BURJ KHALIFA BIN ZAYED(BURJ DUBAI)
PRESENTED BY : DEEPA SHARMASCH. NO. 10110047
CONCEPT STUDYDesign of Burj Khalifa is based on upward-spiral
Islamic architecture style of six spokes of Hymenocallis desert
flower.Designed by: Skidmore, Owings, & Merrill
STRUCTURAL SYSTEM DESCRIPTION
The setbacks are organized such that the towers width changes at
each setback to confuse the wind. The wind vortexes never get
organized because at each new tier the wind encounters a different
building shape.Building is rotated to 120 degrees from its original
layout to reduce stress from prevailing winds.
SPIREThe top section of the tower consists of a structural steel
spire utilizing a diagonally braced lateral system. The structural
steel(4,oootones) spire was designed for gravity, wind, seismic and
fatigue. At its tallest point, the tower sways a total of
1.25m.
MATERIALSHigh density, low permeability concrete used in the
foundationsMore than 4,000 tones of structural steel.Exterior
cladding of consists of 142,000 m2of reflectiveglazing.Aluminium
and texturedstainless steelspandrelpanels
FOUNDATIONS AND SITE CONDITIONSThe tower foundations consist of
a pile-supported raft. The solid reinforced concrete raft is 3.7 m
thick and used self-consolidating concrete (SCC).The raft was
constructed in four separate pours (three wings and the center
core).Reinforcement was typically at 300 mm spacing in the
raft.
LAYING OF FOUNDATIONThe tower raft is supported by 194
reinforcing rods or piles , 1.5 m in diameter and 43 m long, with a
design capacity of 3000 tones each. Then, rods are covered with 3.7
m thick base frame to hold 500,000 ton building.Piles and raft
foundations were designed according to durability. The chloride and
sulfate concentrations found in the groundwater are even higher
than the concentrations in sea water.
PROCESS
SAFETY OF BUILDINGOn the top of base, high strength concrete is
applied to preserve stability and safety of 160 floor building. On
600 m high, residents wont feel a thing against earthquake (mag.
6.0) and strong wind (speed 55 m)To prevent from 60 cm contraction
caused by load of building, each floor is revised and built
accurately.
CONSTRUCTION(3 DAYS CYCLE)
First day
Double reinforcement is moved safely from top which saves a lot
of timeThe tower was constructed by a South Korean companyThe
primary structural system of Burj Khalifa is reinforced concrete.
Over 45,000 m3 (58,900 cu yd) of concrete, weighing more than
110,000 tonnes (120,000 ST; 110,000 LT) were used to construct the
concrete and steel foundation
Second dayWooden frames are carefully installed rigidly to hold
and cover double reinforcementThird dayHigh strength concrete is
pumped from ground using advanced high pressure concrete pumping
technology. Auto Climbing System allows to proceed to next
level.
WIND ENGINEERING
The Burj Khalifa is specially designed to conquer the wind, a
goal that becomes more and more important as altitude increases.Its
designprevents it from forming organized whirlpools of air current,
or vortices, that would even damage the building.13
4 evacuation rooms in case of emergency (1 in every 30 floors)
such as fire or terrorism.High-tech elevators can operate safely
even if building catches fire700 sensors placed on building frames
for live monitoring during constructionTHANK YOU
