performance based seismic design of icon hotel
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Performance Based SeismicEvaluation of Icon Hotel in Dubai
Farshad BerahmanBSc MSc PhD
Senior Structural Engineer
WS Atkins Middle EastDubai, UAE
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Burj Al Arab Dubai
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Atkins Tall Buildings
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Icon Hotel, Dubai
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Icon Hotel Dubai Promenade
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Icon Hotel The Site
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Plan
Lift coresSky Lift
34th level-Mechanical
Floor
8th level-Mechanical
FloorAtrium
160m
96m
78m
165m
Icon Hotel Building Geometry
Elevation
10.8m
13.2 m
4.3m
Key Facts
203 Guest Hotel Room
172 Branded Service Apartments
42 storey wheel
Total built up area 110,000 sqm
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Punched Concrete Walls
The areas with high shear stresses:
1. Thicken the wall - more weight and
more concrete
2. Reduce the number of openings - Not
favourable Architecturally
3. Use steel plates to reinforce the highly
stressed concrete walls - Not standardpractice
Icon Hotel Pre-Concept
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Sketches Courtesy LERA
Peer Review LERAs Proposed Alternative
Permanent
Composite Trusses
Icon Hotel Pre-Concept
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Icon Hotel Concept Design - Functional Framing & Form Finding
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Images Courtesy Samsung
Icon Hotel Pre- Construction Advisor - SAMSUNG
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X
Y
Icon Hotel Preliminary Design
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Gravity Load Path
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Axial Force Diagram
Icon HotelAxial Forces Under Gravity Loads
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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I H l
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Icon Hotel Construction Sequence
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I H t l
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Icon Hotel Construction Sequence
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I H t l C t ti S
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Icon Hotel Construction Sequence
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Icon Hotel C t ti S
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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Icon Hotel Construction Sequence
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co ote Construction Sequence
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q
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Icon Hotel Mega Frame LLRS
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Deformation has shear
configuration withmaximum inclination nearthe base
Deformationhas bendingconfigurationand story driftincrease withheight
Icon Hotel
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Steel Weight
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ICON HOTEL 29th January 2009
Steel Weight
Trusses, Arches and vertical
elements: 10250 ton
Floor Beams: 7000 ton
Icon Hotel Modes of Vibration
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T1 = 4.3 Sec T2 = 3.3 Sec T3 = 3.0 Sec
Icon Hotel Specialist Studies
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Geotechnical Study Liquefaction Analysis
Soil Improvement Seismic Hazard Study Wind Tunnel Study Pile Raft Settlement Analysis Floor vibration analysis Connections Detail Design Long Term Effect (Column Shortening) Performance Based Seismic Evaluation
Icon Hotel Wind Tunnel Studies
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Inter story drift less than H/1000
Images & DataCourtesy RWDI
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For more information please visitCTBUH website and search forCTBUH 2010 Mumbai Conference
Foundation Type
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ICON HOTEL 29th January 2009
Foundation Type
Piled Raft
Other areas areon pile groups orindividual piles
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ICON HOTEL 29th January 2009
Pile Raft Settlement Analysis-Predicted Settlement (DL+LL) by PIGLET
Maximum Settlement:
93mm
Maximum Settlement:90mm
Pile Raft Settlement Analysis-Predicted Settlement (DL+LL) by FEAR
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ICON HOTEL 29th January 2009
CONTOURS OF VERTICAL DISPLACEMENT
I co n Ho te lI co n Ho te lI co n Ho te lI co n Ho te l
S e t t l e me n t A sse ssme n tS e t t l e me n t A sse ssme n tS e t t l e me n t A sse ssme n tS e t t l e me n t A sse ssme n t
E q u i val e n t Ra f tEqu iva lent Raf tE q u i val e n t Ra f tEqu iva lent Raf t
Contour LegendContour LegendContour LegendContour Legend
1 .0 0 0 E -0 21.000E-021 .0 0 0 E -0 21.000E-02
2 .2 0 0 E -0 22.200E-022 .2 0 0 E -0 22.200E-02
3 .4 0 0 E -0 23.400E-023 .4 0 0 E -0 23.400E-02
4 .6 0 0 E -0 24.600E-024 .6 0 0 E -0 24.600E-02
5 .8 0 0 E -0 25.800E-025 .8 0 0 E -0 25.800E-02
7 .0 0 0 E -0 27.000E-027 .0 0 0 E -0 27.000E-02
8 .2 0 0 E -0 28.200E-028 .2 0 0 E -0 28.200E-02
9 .4 0 0 E -0 29.400E-029 .4 0 0 E -0 29.400E-02
1 .0 6 0 E -0 11.060E-011 .0 6 0 E -0 11.060E-01
1 .1 8 0 E -0 11.180E-011 .1 8 0 E -0 11.180E-01
1 .3 0 0 E -0 11.300E-011 .3 0 0 E -0 11.300E-01
1 .4 2 0 E -0 11.420E-011 .4 2 0 E -0 11.420E-01
1 .5 4 0 E -0 11.540E-011 .5 4 0 E -0 11.540E-01
1 .6 6 0 E -0 11.660E-011 .6 6 0 E -0 11.660E-01
MaximumSettlement:112mm
Maximum
Settlement:107mm
Icon Hotel Design of Connections
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Floor System
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Strength
Deflection Vibration Acoustic 2hrs Fire
Density400kg/m^2
Density560 kg/m^2
10.8m
13.2 m
4.3m
10.8m
13.2 m
4.3m
Design of Floor for Vibration Traditional approach
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F1>4 Hz
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PDR Current Design
SB 1 217 kg/m 114 kg/m
SB 2 117 kg/m 100 kg/m
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Icon Hotel Floor Vibration Analysis
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Floor Vibration Analysis-In-house Program
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R-Factor
Floor Vibration Analysis-MIDAS model
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Walking Load
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Vibration Mode Shapes-MIDAS model
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PDR and Detail Design Cost Comparison
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ICON HOTEL 29th January 2009
More than 21 million AED
SAVED
Icon Hotel Column Shortening
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ICON HOTEL
MIDAS Model
Icon Hotel Differential Shortening Between Inner and Outer Walls
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ICON HOTEL 29th January 2009
Icon Hotel
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ICON HOTEL 29th January 2009
Icon Hotel Seismic hazard study
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Seismic Hazard StudyCourtesy Fugro West Inc.
Magnitude Probability Density Function
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Seismic Hazard StudyCourtesy Fugro West Inc.
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Seismic Hazard StudyCourtesy Fugro West Inc.
()
1 1994 , A 6.7 18.2 90053
106 196
2 1976 , 6.8 22.3 9201 A000
A090
3 1992 , A 7.3 42.5 12025
A
A 000
A090
The estimated equal hazard horizontal response spectrum at rock boundary
Icon Hotel Performance Based Design Seismic Evaluation
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Icon Hotel Performance Based Design Seismic Evaluation
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Icon Hotel Performance Based Seismic Design Perform 3D
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Icon Hotel Performance Based Seismic Design Material Behaviour
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Figure 18. Stress-Strain relationship for unconfined C70 concrete
Un confined C70 (70 Mpa) concrete
Steel S355(355 Mpa yield strength) built up section Reinforcement (460 Mpa yied strength)
Icon Hotel Performance Based Seismic Design Damping
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Icon Hotel Performance Based Seismic Design Performance objectives
A B
2 2 3
/ / /
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/ / /
A 3
A
2
A
2
A
/
2A B 97
475
2475
B 97=4.5B
/A /A
%2
=0.7**
2.5% ( 2009) 3.5% ( 2009)
B 97
A & & &
Icon Hotel Performance Based Seismic Design Desired Behaviour
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Bhaviour under gravity load
Icon Hotel Performance Based Seismic Design Perform 3D
the envelope of inter-story drifts.
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Compressionstrain about0.0012
Concrete Couplingbeams behavenonlinear
Envelope of the concrete compressionstrain at critical locations
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All the members remained elastic except couplingbeams Building met the performance objectives.
Lander 1992-scaled earthquake
Concrete compression
strain 0.0016
Coupling beams
behave nonlinearly
Icon Hotel Performance Based Seismic Design Perform 3D
Figure 28. The envelope of shear force and the capacity of central shear wall.
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The envelope inter-story drift ratios for MCE The envelope of shear force and the capacity of central shear wall.
Icon Hotel Performance Based Seismic Design Dissipated Energy
Figure 28. The envelope of shear force and the capacity of central shear wall.
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Icon Hotel Performance Based Seismic Design Usage Ratios
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Icon Hotel Performance Based Seismic Design Perform 3D
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Scaled Lander 1992
increased 4x to see the
extreme behaviour
Conclusions and observation
Large gravity transfer structures can be used efficiently to
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g g y y
mobilise frame action by coupling the core walls.
Icon hotel Performance Based Design evaluation showed that
this building will behave in a desired manner for future
anticipated earthquake.
Bearing wall system: Ductility ?? Overstrength
Minimum base shear from the code. Do we need to follow?
Performance based design provides valuable information for
the seismic design of geometrically complex structures which
lie beyond the realms of established building codes.