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

Images Courtesy Tekla


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I H l


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I H t l


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I H t l C t ti S


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Icon Hotel C t ti S


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co ote Construction Sequence




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q




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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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Foundation Type

Piled Raft

Other areas areon pile groups orindividual piles


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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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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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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


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Icon Hotel Seismic hazard study


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Seismic Hazard StudyCourtesy Fugro West Inc.

Magnitude Probability Density Function


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()

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


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


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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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.

Performance Based Seismic Design of Icon Hotel

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