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Core
design
Case studies
• Vertical circulation
• Configuration
• Floor-plate design
• Function of Service Core
• Service core types & placement
• Service Core & Building Economy
• Elevator design & configuration
• Population density
• Traffic analysis
• Quality of ride
• Service-core layout & space
requirements
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Case studies
Core design
Vertical Circulation
• Cores = service cores = risers
• Contains:– Elevator shafts
– Elevator lobbies
– Main & escape stairways
– Riser-ducts
– Toilets
– Other service rooms
• Elevators = MAIN vertical circulation system
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Case studies
Core design
Configuration
At initial design stage, designer DETERMINES:
• Buildable net rentable areas (NRA)
• Gross floor areas (GFA)
• Typical & atypical floor-plates
• Prepare a diagram + propose elevator configuration:
• No. of banks
• No. of stops
• Transfer floor(s)
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Case studies
Core design
Example of area tabulation &
elevator configuration diagrams:
FLOOR LEVEL NET SERVICE GROSS CAR-PARK CAR-PARK EFFICIENCY
(NRA) (GFA)
BASEMENT B1 - B3 0 1,229 150 59,365
GROUND 1 2,274 2,231 4,105 55%
BANKING 2 9,799 2,231 12,034 81%
BANKING 3 9,799 2,231 12,034 81%
CAR PARK 4 - 18 0 6,148 548 249,525
(15 levels)
LIFT FLOOR 19 7,769 2,231 10 000 78%
OFFICE 20 - 34 AVE 2,231 AVE
(15 levels) 12,799 15,03 85%
LIFT FLOOR 35 7,769 2,231 10 000 78%
OFFICE 36 - 50 AVE 1,585 AVE
(15 levels) 12,799 15,03 89%
PENTHOUSE 51 9,27 1,585 10,858 85%
PENTHOUSE 52 3,218 1,585 4,803 67%
TOTAL 51 438,544 76,21 514,754 695 308,89 85%
GROSS 823,644
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Case studies
Core design
50
45
40
35
30
25
20
15
10
5
2 levels
penthouse
15 levels tower
offices
Interchange level
Interchange level
2 levels banking
15 levels above
ground car
parking
3 car-
park
zone lifts
6 banking
and lower
offices
zone lifts
6 upper
offices
zone lifts
No. of
elevators:
= Lift opening
Schematic diagram
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Case studies
Core design
Designer’s consideration:
• Typical floor plate sizes
• Typical floor plate efficiency
• Staircase positions
• Tenancy options
• View outward
• M&E risers and routes
• Structural system options
• etc
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Case studies
Core design
Floor Plate Design
• Staircase usually grouped with elevators
• As means of escape & accessibility
• Same goes with M&E riser ducts
• Aspects that affect the floor-plate design:
– Direction of best views out
– Permissible ground floor plinth are
– Car-parking grids in relation with floor-plate structural
configuration
Floor-plate efficiency should not be less than 75%
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Case studies
Core design
Function of Service Core
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Case studies
Core design
Service core types & placement
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Case studies
Core designService core types & placement
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Case studies
Core design
Service Core & Building Economy
• Minimization of material costs
• Optimization of core
geometry
• Minimization of core area
• Minimization of construction
time
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Case studies
Core design
Benefits of a peripheral core position:
• No fire-fighting pressurization duct is needed
• Good view out
• Natural ventilation
• Natural sunlight
• A safer building in the event of total power failure
• Solar-buffers & energy savings
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Core design
Requirements for elevator
selection service
EXCELLENT GOOD FAIR
SERVICE SERVICE SERVICE
COMMERCIAL
BUILDING
Up-peak interval 28 secs 30 secs 35 secs
5-minute up-peak
handling capacity 14 - 15% 13 - 13.5% 11 - 12%
HOTEL BUILDING
2 way lobby traffic 35 - 40 secs 45 - 50 secs 55 - 60 secs
5-minute up-peak
handling capacity 14% 13% 12%
APARTMENT
BUILDING
2 way lobby traffic 50 - 55 secs 60 - 65 secs 70 - 75 secs
5-minute up-peak 7% 6% 5%
CAR-PARK BUILDING
2 way lobby traffic 35 secs 40 secs 50 secs
5-minute up-peak 13.5 - 14% 12.5 - 13% 11 - 12%
2 common
performance
criteria:
•Average waiting
interval (AWI, in
seconds)
•5-minute
handling capacity
(in %)
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Case studies
Core design
Suggested elevator capacity
COMMERCIAL HOTEL APARTMENT CAR-PARK
884kg (13 persons) yes yes
952kg (14 persons) yes yes yes
1088kg (16 persons) yes yes yes yes
1360kg (20 persons) yes yes yes
1564kg (23 persons) yes yes
1768kg (26 persons) yes
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Case studies
Core design
Elevator Design & Configuration
Elevator design should give optimum:
• Number of elevators
• Types of elevators
• Elevator capacities
• Arrangement o elevator
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Case studies
Core design
Examples of GOOD & BAD elevator arrangement
TWO-CAR GROUPING
• Side-by-side arrangement is
best
• Passenger face both cars & can
react
immediately
• AVOID separation of elevators
• EXCESSIVE separation
destroy
advantages of group operation
THREE-CAR GROUPING
• 3 cars in a row is
PREFERRABLE
• 2 cars opposite 1 is acceptable
• PROBLEM: location of elevator
call button
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Case studies
Core design
FOUR-CAR
GROUPING
• commonly in large,
busier buildings
• 2-opposite-2
arrangement is the
most efficient
SIX-CAR
GROUPING
• found in large office
buildings, public
buildings & hospitals
• provide quantity &
quality
• 3-opposite-3 position
is PREFERRED
• dimension of the
LOBBY must not be
less than 3m or 3.6m
if function as a
passageway
EIGHT-CAR
GROUPING
• the largest PRACTICAL
group
• 4-opposite-4 arrangement
Examples of GOOD & BAD elevator arrangement
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The common performance criteria is based on 5 minute
morning up-peak condition & measure:
• Quantity
• Quality
• Travel Time
Case studies
Core design
Population density
Densities of 'sq m of NRA per person' for a diversified commercial office
LOW MEDIUM HIGH SKY
SINGLE SEGMENT
BUILDING 11 N/A N/A N/A
TWO-SEGMENT BUILDING 11 N/A 12 N/A
THREE-SEGMENT
BUILDING 11 12 13 N/A
FOUR-SEGMENT
BUILDING 11 12 13 14
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Case studies
Core design
Population density
LEVEL OF SERVICE EXCELLENT GOOD FAIR
AWI (SECONDS) 28 30 35
(% OF POPULATION) 14 - 15 13 - 13.5 11 - 12
TRAVEL TIME (SECONDS) 100 120 <150
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Case studies
Core design
Traffic Analysis
• General planning
• Multiple rises
• Multiple entry levels
• Car-parking floors
• Special purpose floors
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Case studies
Core design
Quality of ride
• Elevator shaft area should be at least 20% greater than the car
platform area
• Guide rails with fixing point s at a maximum of 2.4 m are required to
provide a rigid running surface for the car guides.
• Guide-rail alignment must allow for vertical movement
• Car guides. Roller type car guides fitted with a tyre compound suited
to local conditions & approx. 30 cm dia. Necessary to achieve
quality of ride
• Pendulum car as means to reduce negative effects of poor guide rail
alignment
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Service-core layout & space requirements
Case studies
Core design
• Elevator car sizes & shapes
• Elevator door types & sizes - common widths 1.1 m or 1.2m
• Elevator shafts - are according to car shapes & sizes, and
door sizes. Sufficient air around cars & counterweights should
be provided to minimize buffeting & air-borne noise during
operation.
• Elevator core & lobby planning - ‘outward facing’ elevators VS
‘inward facing’ elevators.
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Case studies
Core design
Service-core layout & space requirements
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Case studies
Core design
References
• Ken Yeang, The Skyscraper Bioclimatically
Considered – A Design Primer, Academy Group,
Malaysia, 1996.
• Ken Yeang, Service Cores – Detail in Building,
Wiley-Academy, Italy, 2000.
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1. commercebank frankfurt by foster & partners
2. petronas twin towers by cesar pelli & associates
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commercebank frankfurt by foster & partners
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typical floor plan layout
1. escape stair
2. service lift
3. lift lobby
4. lavatories
5. service rooms
6. combi-offices
7. team offices
service core
commercebank frankfurt by foster & partners
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blow-up plan of service core
1. escape stair
2. service lift
3. lift lobby
4. stair pressurization duct
5. document hoist
6. risers
4
56
6
commercebank frankfurt by foster & partners
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commercebank frankfurt by foster & partners
dry cooler
wet cooler
chillerplant roomconference roomsdirector’s office
garden terraces
east garden and interchange
building management offices
plant rooms
secondary plant
entrance lobby and plaza
shops and plant rooms
plant rooms and loading bay
plant rooms
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commercebank frankfurt by foster & partners
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petronas twin towers by cesar pelli
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petronas twin towers by cesar pelli & associates
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petronas twin towers by cesar pelli & associates
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petronas twin towers by cesar pelli & associates
typical floor plan layout
service core
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petronas twin towers by cesar pelli & associates
1. escape stair
2. service lift
3. lift lobby
4. lavatories
5. risers
6. office
1
1
2
3
44
5
5
6
6 6
level 43 plan
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petronas twin towers by cesar pelli & associates
level 76 plan
1. escape stair
2. service lift
3. lift lobby
4. lavatories
5. risers
6. office
1
1
2
34
5
6
4
6
6
6
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petronas twin towers by cesar pelli & associates
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Innovations in core designs
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cctv china, beijing by OMA
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burj dubai by skidmore, owings & merrill
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dancing tower by zaha hadid
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dancing tower by zaha hadid
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dancing tower by zaha hadid
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The End