for architecture student

1. Submitted by:
UG 09 07 06 015
UG 09 07 06 016
UG 09 07 06 017
Structural
POST SLAB
Analysis

2. Conventional structural system
Post lintel
Wall slab Post slab

3. POST SLAB ALSO KNOWN AS BEAMLESS THE R.C.C SLAB SUPPORTED ON
COLUMNS WITHOUTTHE AGENCY 0F BEAMS OR GIRDERS . THE SLAB IS BUILT
MONOLITHICALLY WITH THE SUPPORTING COLUMNS . WHICH ARE ARRANGED
IN SUCH A MANNER THAT THEY FORM SQUARE OR EARLY SQUARE PANELS .
DEFINATION OF POST SLAB
CAPITAL
COLUMN
VIEW SHOWING FLAT SLAB CONSTRUCTION
SLAB
DROP
PANEL

4. POST - SLAB STRUCTURAL SYSTEM :
POST - SLAB STRUCTURE CONTAIN TWO ELEMENTS.
- VERTICAL ELEMENTS ARE THE POST.
- HORIZONTAL ELEMENT IS THE ROOF.
THE LOAD TRANSFERRING MECHANISM IS POINTED
& THE ROOF TRANSFERS THE LOAD TO THE GROUND
THROUGH THE COLUMNS. HERE THE WHOLE SLAB
ACTS LIKE A BEAM.
IN THIS TYPE OF STRUCTURE THE DESIGNER
HAS THE FREEDOM OF MAKING DIFFERENT
PLANS IN DIFFERENT LEVELS, AS THE WALLS
ARE NO LONGER LOAD BEARING. SO A
FREE PLAN ORGANIZATION CAN BE DEV-
ELOPED.
FREE PLAN ORGANIZATION :

5. THERE ARE THREE TYPES OF POST SLAB
1. FLAT PLATE POST SLAB
3. EDGE BEAM POST SLAB
2. FLAT WITH DROP POST SLAB
COLUMN HEAD
DIA OF COLUMN
4 CM THICKNESS OF DROP
THICKNESS OF SLAB
EDGE COLUMN
EDGE BEAM
THICKNESS OF SLAB
FLAT PLATE SLAB
DIA OF COLUMN
THICKNESS OF SLAB

6. FLAT POST SLAB
FLAT POST SLAB IS A MONOLATHIC STRUCTURE
IN POST SLAB .
FLAT POST SLAB
A flat plate is a concrete slab of uniform
thickness reinforcement in two direction
supported by column without beams.
Tensile reinforcement
SLAB DEPTH :5”to 12”(150 to 305)
typical slab depth :span/33
SUITABLE SPAN : for relatively heavy
loads and spans from 20’ to 24’
STRUCTURAL ANALYSIS

7. FLAT WITH DROP POST SLAB
WHERE THE COLUMN IS NOT SUFFICIENT FOR BEAR THE LOAD,THERE USE
DROPSLAB. AT FIRST LOAD DISTRIBUTEDIN DROP SLAB THEN IT DISTRIBUTE
LOAD INTO COLUMN.
A flat slab is a flat plate thickened at its column
supports to increase its shear strength and mo-
ment resisting capacity.
Tensile reinforcement
SLAB DEPTH :6”to 12”(150 to 305)
typical slab depth :span/36
DROP PANEL :Minimum projection of drop panel ;
0.25x slab thickness.
DROP WIDTH :Minimum width of drop panel
;0.33 span .
SUITABLE SPAN : for relatively heavy loads and
spans from 20’ to 40’(6 to 12 m)FLAT WITH DROP POSTSLAB

8. EDGE BEAM POST SLAB
EDGE BEAM USE FOR CANTILEVER
PORTION . IN THE GROUND LEVEL
THERE USE OF EDGE BEAM.
EDGE BEAM
POST SLAB
SOME TIMES THIS BEAM USE CONTINUOUSLY
IN DOUBLE HEIGHT.

9. STRUCTURAL ANALYSIS
-THE PANEL SERVE THE PURPOSES OF
DECRESING THE SHEAR STTRESS AT THE
COLUMN HEAD AND PROVIDES THE
INCREASED DEPTH OF SLAB NECESSA-
RILY REQUIRED TO SAFELY BEAR THE
EXCESSIVE BENDING MOMENT NEAR
THE COLUMN.
-POST SLAB IS ASSUMED THAT THE SLAB
IS DEVIDED IN THREE STRIPS IN EACH-
DIRECTION. THE OUTER STRIPS ARE TER-
MED AS COLUMN STRIPS WHILE THE IN-
NER STRIP IS TERMED AS MIDDLE STRIP.
-IN SLABS WITHOUT DROPS THE WIDTH
OF THE COLUMN STRIP SHOULD BE
THE WIDTH OF THE PANEL AND IN SL-
ABS WITH DROPS WITH SROPS IT SHO-
ULD BE EQUAL TO WIDTH OF THE DR-
OPS
Column
strip
Column
strip
Middle
strip
Column
strip
Column
strip
Middle
strip

10. REINFORCEMENT SYSTEM OF POST SLAB
COLUMN STRIP
MIDDLE STRIP
2. REINFORCEMENT IS PLACED IN FOUR
DIRECTIONS & IT CONSISTS OF TWO
BANDS OF MAIN STEEL BAR CARRISD
DIRRECTLY FROM COLUMN TO COLUMN , &
TWO OTHER BANDS PLACED DIGONALLY
ACROSS THE PANEL FROM COLUMN TO
COLUMN.
1. TWO-WAY SYSTEM ( THE COLUMN STRIP )
2. FOUR WAY SYSTEM ( THE MIDDLE STRIP)
1. REINFORCEMENTS ARE CARRIED
FROM COLUMN TO COLUMN
PARALLEL TO THE SIDE OF
PANELS & A TWO-WAY SYSTEM
OF BAR IS PLACED IN THE
CENTRAL PORTION OF THE SLAB.

11. CONSTRUCTION TECHNIQUES
THERE ARE TWO TECHNIQUES CAN APPLIED IN POST SLAB CONSTRUCTION .
1.PRE-CAST TECHNIQUE
IN PRE CAST TECHNIQUES COLUMNS AND SLABS ARE
PREPARED PREVIOUSLY IN INDUSTRY THEN IT IS JOINT
.
THIS CONSTRUCTION DURATION IS TOO MUCH LESS
THAN ANY OTHER SYSTEM.
IN MANUAL CONSTRUCTION SYSTEM, COLUMN IS
BUILT ON THE BASEMENT THAN SLAB BUILD..
PRE-CAST TECHNOLOGY IS PRACTISED RARELY
BUT MANUAL SYSTEM IS PRACTISED AVAILABLE
IN OUR COUNTRY
2.MANUAL WAY
IN CONSTRUCTION SITE

12. FOUNDATION SYSTEM AND MATERIALS
DEEP FOUNDATION :
DEEP FOUNDATION EXTEND DOWN THROUGH
UNSUITABLE OR UNSTABLE SOIL TO TRANSFER
LOAD BELOW THE SUPERSTRUTURE.
TWO TYPES OF DEEP FOUNDATION :
1. PILE FOUNDATION
2. CAISSON FOUNDATION

13. PILE FOUNDATION
THERE ARE MANY SYSTEMS OF PILE FOUNDATION :
1.TIMBER PILES
2. COMPOSITE PILE
3. H-PILE
4. PIPE PILE
5.PRECAST CONCRETE PILE
POLE FOUNDATION

14. COLUMN FOOTING

15. THE BETWEEN COLUMN TO COLUMN MAXIMUM
SPANS, LONG DISTANCE DIVIDED BY SHORT
DISTANCE EQUAL 1.33.
LONG DISTANCE 26
=
SHORT DISTANCE 20
SLAB THICKNESS
= 1.30
SHORT DISTANCE = 20’
’-0”LONGDISTANCE=26’
( SO IT IS CONSIDER)

16. EQUATION OF POST SLAB THICKNESS
LONG DISTANCE x 12 26 x 12
= =
36 36
SLAB THICKNESS :
CANTILEVER SLAB THICKNESS :
8.5”
LONG DISTANCE x 12
12
CANTILEVER SPAN MAXIMUM : 5’- 8’ (FOR LIVE LOAD)
12’ (FOR DEAD LOAD)
POST SLAB THICKNESS SHOULD BE MINIMUM 5” & MAXIMUM 12” .
ECONOMICAL SPAN : COLUMN TO COLUMN DISTANCE 24’-0”

17. PUNCH :
L / 4 - DISTANCE MIDDLE STRIP SHOULD
BE PUNCH
CONSIDERATION OF PUNCH IN POST SLAB

18. WAFFLE STRUCTURE
IT IS ALSO ONE KIND OF POST SLAB STRUCTURE.
Two – Way Waffle Slab
A waffle slab is a two-way concrete
slab reinforced by ribs in two
directions. Waffle slabs are able to
carry heavier loads and span longer
distances than flat slabs
Tensile reinforcement
SLAB DEPTH :3”to 4-1/2”(75to 115)
rule of thumb for total depth :span / 24
5”or 6”(125 or 150)rib width
SUITABLE SPAN : Suitable for spans of 24’to 54’(7to
16m);longer spans may be possible with posttensioning .
For maximum efficiency ,bays should be square or neatly square as
possible .
BAY SIZE :

19. TO BEAR THE LOAD OF STAIR
THERE MUST BE PROVIDE BEAM.
BEAM USE : IN STAIR

20. 1) This slab mainly used by commercial heavy construction project.
2) This is the Beamless Monolithic Structure.
3) Saving in the Storey Height.
4) Better Lighting & Facilities are available.
5) Better workable at HVAC system.
6) Easily rearrangement of interior & smoothly uses of exterior
curtain wall.
7) Comparatively save the time schedule.
8) Designer easily setup the opening and it is visually comfortable.
ADVANTAGE AND DISADVANTAGE OF POST SLAB DESIGN
1. This slab is beamless so, it is risky for earthquake.
2. It is strictly maintain by grid system.
3. Organic muss handling not easy.
4. Difficult for set-back .
5. Mostly used by false ceiling.
6. Comparatively costly.
ADVANTAGE OF POST SLAB
DISADVANTAGE OF POST SLAB

21. - DOM-INO WAS EVEN MORE IMPORTANT THAN THE
HOUSES.
- THE FLOOR SLABS AS PRIMARY DOMINO LIKE UNITS
FLOATING ON SIX FREE STANDING POSTS.
-IT WAS FORMED FROM THREE RECTANGULAR
HORIZONTAL SLABS SUPPORTED ON SIX SLENDER
STANCHIONS.
- EACH SQUARE PLAN.
- THE BOTTOM SLAB WAS ON BLOCKS.
- THERE WERE NO CAPITAL OR BEAMS.
- THE STRUCTURE WAS THUS FREE OF TRABEATED
RIGIDITY.
DOM-INO HOUSE
THIS TIME WAS 1914, ARCHITECT LE CORBUSIER PRODUCT SEVERAL NEW FORMATS FOR HOUSES,
OF WHICH THE MOST IMPORTANT WAS HIS SO CALLED DOM-INO HOUSES.
CHARACTERISTICS OF DOM-INO HOUSES:

22. 1.THE PILOTI , OR ELIMINATION OF THE GROUND
STOREY WITH THE ELEVATION OF THE HOUSE
ABOVE PILOTIS FREE STANDING FERROCONCRETS
POSTS.
2.THE FREE PLAN OR FREE INTERIOR PLANNING BY
MEANS OF PARTITION WALLS SLOTTED BETWEEN
THE SUPPORTS.
3.THE FREE FAÇADE , OR FREE COMPOSITION OF
THE EXTERNAL CURTAIN WALLS.
4.THE STRIP WINDOW, OR PREFERENCE FOR
RIBBON WINDOWS.
5.THE ROOF TERRACE , A FLAT ROOF , USED AS A
GARDEN TERRACE .
FIVE POINTS OF NEW ARCHITECTURE

23. CASE STUDY
THE VILLA SAVOYE
AT POSSY OUT SIDE PARIS EVOLVED AS A
FULL REALIZATION OF HIS FIVE POINT
PROGRAMME.
CHARACTERISTICS OF VILLA SAVOYE :
1. FULL FILL OF FIVE POINTS OF PROGRAMME,
2. SQUARE SINGLE STORED BOX.
3. PURE, SLEEK, GEOMETRIC, ENVOLVE,
SLENDER, PILOTS,
4. NARROW RIBBON WINDS,
5. THE IMPORTANT OF THE CHANGING VIEW
PONTS,
6. ITS CALLED A “CONSTRUCTION SPRITUALLE”.
7. THE HOUSE OPEN TO LIGHT, SUN & VIEWS
WHITE PAINT ON PILOTI SAND.
8. THE BUILDING APPROCH IS BY CAR.
NOW ,THE VILLA SAVOYE IS USED BY A
NATIONAL MONUMENT .
VILLA SAVOYE , POSSY , 1928-29,
LE CORBUSIER

24. VILLA SAVOYE , POSSY , 1928-29, LE CORBUSIER
RIBBON WINDOW :
THE STRIP WINDOW, OR PREFERENCE FOR
RIBBON WINDOWS EXPRESS HORIZONTALITY
IN WHOLE BUILDING.
FREE COLUMN :
THE PILOTI , OR ELIMINATION OF THE GROUND
STOREY WITH THE ELEVATION OF THE HOUSE
ABOVE PILOTIS FREE STANDING C ONCRETS
POSTS.

25. FREE PLAN IN INTERIOR :
THE FREE PLAN OR FREE INTERIOR PLANNING
BY MEANS OF PARTITION WALLS SLOTTED
BETWEEN THE SUPPORTS.
THE ROOF TERRACE :
VILLA SAVOYE , POSSY , 1928-29, LE CORBUSIER
A FLAT ROOF , USED ASA GARDEN TERRACE.
FREE FAÇADE :
THE FACADE OF THE BUILDING IS ALSO INDEPENDENT
OF ITS STRUCTURE. THE POST MAY BE SET
BACK FROMTH FAÇADE INSIDE THE BUILDING.

26. VILLA SAVOYE , POSSY , 1928-29, LE CORBUSIER
DYNAMIC AND NON-TRANSITIONAL
RELATIONSHIP BETWEEN FLOOR-TO
SPIRAL STAIR.
SPIRAL STAIRCASE:
INTERIOR RAMP RAMP TO ROOF GARDEN
RAMPS BUILTS IN FURNITURE.RAMP :

27. VILLA SAVOYE , POSSY , 1928-29, LE CORBUSIER
SOLID VOID ORGANIZATION

28. SHODAN HOUSE:
This superb Indian house designed by Le
Corbusier has the appearance of some
sort of three-dimensional mathematical
puzzle.
The machine age polemic to a more primal
relationship between man and his living space.
RELATION WITH SPACE
CASE STUDYSHODAN HOUSE, AHMEDABAD,1952-1956
LE CORBUSIER

29. SHODAN HOUSE, AHMEDABAD,1952-1956
LE CORBUSIER PLAN OF SHODAN HOUSE

30. SHODAN HOUSE, AHMEDABAD,1952-1956
LE CORBUSIER
The structural concrete frame allows an openness
in both plan and section, creating spaces prescribed
only by one’s movement through them via such
connecting devices as the horizontally biased
architectural promenade.
From the roughness and randomness of the imprinted wood
form work,to the complexity and infinite perceptionsof spaces,
FAÇADE TREATMENT
SOLID VOID RELATIONSHIP

31. Through the absence of interior partitions, Le Corbusier was able to bring natural
light into the certain spaces as an architectural material. This, along with the
free passage of the warm Indian breeze created a tactile and ever-changing
Environment with a strong connection to the natural site. In effect, the Villa’s
openness is its most tangible trait.
INTERIOR ORGANIZATION
SHODAN HOUSE, AHMEDABAD,1952-1956
LE CORBUSIER

32. CASE STUDY
NATIONAL ART GALLERY.DHAKA

33. RAMP UP
LIFT
LIFT
TOILET
UP
UP
1750
125
UP
TOILET
LIFT
+ 150
OFFICESTORE
PACKAGING & CARPENTRY WORK SHOP
STORE
ELECTRO MECHANICAL ROOM
RAMP
+ 150
A
A
CERAMIC TILES
100x100x25or 100x200x25
100x100x25or 100x200x25
CERAMIC TILES
100x100x25or 100x200x25
CERAMIC TILES
100x100x25or 100x200x25
CERAMIC TILES
100x100x25or 100x200x25
CERAMIC TILES
MOSAIC
MOSAIC
MOSAIC
MOSAIC
N. C .F
MARBLE
MARBLE
MARBLE
W/F. TILES
dated 25th Dec. 1999
As per decision
Door size 2400x3000
W/F. TILES
up
RAMP
RAMP
D2
D8
D3
D4
D5
D4
D4
D5
D6
W2
H/W
H/W
H/WH/W
H/W
H/W
H/W
D6
D5
H/W
W2
W2
W2
D6
D6
TOILET ( L )
250
D6
H/W
H/W
D4
D4
D4
W2
3250
4050
D6
D6
1000
XX
4500
X X
AHU
Ground floor plan
LIFT
LIFT
TOILET
125
UP
LIFT
TOILET
RECPTION LOBBY
P L A Z A
TEMPORARY GALLERY
UP
B B BB B
BBB B
A
A
AA
A
A
A
A
C A
A
BB
A
A
B B
D
C
C
CC
BB BB B
B
A
B
A
A
D
DOUBLE HIGHT
RECEPTION
C
718
704 750
510072005088
3375
NON SLIPE TILES
TILES
MARBLE
W/F TILES
MARBLE
W5
W2
D5
D6
D6 D6
W4
D5
W2
W4
W3
W3
W6
W5
D6
D8
D8
D6
W/F TILES
D6 D6
D7 D7
D5
3250
W/F. TILES
TOILET
DOUBLE HIGHT
AHUX1 X1
X X
X1X1
XX
First floor plan
NATIONAL ART GALLERY.DHAKA
PLAN OF ART GALLERY

34. 1200
1200
NATIONAL ART GALLERY.DHAKA
SECTION AND ELEVATION OF ART GALLERY
SECTION
ELEVATION

35. FREE STANDING COLUMN:
WAFFLE STRUCTURE:
WHERE THE SPAN IS LONG BUT THICKNESS
NEVER EXED THAN 12”.PROVIDE WAFFLE
STRUCTURE
NATIONAL ART GALLERY.DHAKA
USE COLUMN IN DOUBLE HEIGHT
SPACE IN ENTRY LOBBY.

36. DROP POST SLAB :
USE OF BEAM :
USE BEAM TO BEAR THE LOAD OF STAIR
UNDER THE FLIGHT.
NATIONAL ART GALLERY.DHAKA
USE DROP POST SLAB FOR MAXIMUM SPAN
WITH SERIES OF PLATES.

37. MAXIMUM OPENING :
CONTINUOUS BEAM :
NATIONAL ART GALLERY.DHAKA
IN POST SLAB WE CAN PROVIDE MORE
OPENING THAN OTHER STRUCTURE.
BECAUSE OF THERE NO USE OF BEAM.
USE FOR DOUBLE HEIGHT SPACE WITHOUT SLAB

38. NATIONAL ART GALLERY.DHAKA
MAXIMUM STORY HEIGHT :
IN POST SLAB WE CAN GET
BETER FACILITY IN FLOOR
HEIGHT.THERE USE BEAM
WITHOUT FLOOR HEIGHT
DECREASE.

39. CASE STUDYINSTITUTE OF FINE ARTS.DHAKA

40. INSTITUTE OF FINE ARTS.DHAKA
PLAN OF FINE ARTS INSTITUTE
GROUND FLOOR PLAN FIRST FLOOR PLAN
LANDSCAPEPLAN

41. FLATE PLATE SLAB :
IT IS A BEST EXAMPLE OF FLATE PLATE
POST SLAB STRUCTURE.
SPIRAL STAIR :
SPIRAL STAIR WHICH IS RESISTS ARROUND
THE COLUMN,
INSTITUTE OF FINE ARTS.DHAKA

42. ASA TOWER
HEAD OFFICE BUILDING OF ASA
CASE STUDY

43. GROUND FLOOR PLAN
KHILJIROAD
ENTRY FROM
KHILJI ROAD
PARKING
ELECTRICAL SUB-STATION & GENERATOR ROOM DRIVER'S
RAMP TO BASEMENT PARKING
ENTRY FROM
MIRPUR RD.
PABX
LIFT LOBBY
RECEPTION
STAIR-2STAIR-1 SECURITY
OFFICE
A/C DUCT
RAMP FOR
HANDICAPPED
R.C.C.
BENCH
WAITING
9
ELT PANEL
(WITH SOUND PROOF CANOPY)
770 kVA DIESEL GENERATOR
L=6110mm, W=1950mm, H=2500mm
14 1213 111516
550 KVAR PFI
10
HT
RMU
PANEL
DESA
METERING
4
3 12
3000 KVA
8 7 56
1200 KVAR PFI LT PANEL
TRANSFORMER
PLAN OF ASA TOWER
TOILET
(F)
TOILET
(M)
TEA PREP.
EXE.
TOIL
A/C
TOILET
(F)
TOILET
(M)
EXE.
TOIL
A/C
TEA PREP.
FIRST FLOOR PLAN
ASA TOWER
HEAD OFFICE BUILDING OF ASA

44. ASA TOWER
HEAD OFFICE BUILDING OF ASA
POST WITH EDGE BEAM:
EXPRESSION LIKE POST LINTEL
SPIRAL STAIR :

45. ASA TOWER
HEAD OFFICE BUILDING OF ASA
WINDOW :
THE STRIP WINDOW, OR PREFERENCE FOR
RIBBON WINDOWS EXPRESS HORIZONTALITY
IN WHOLE BUILDING.

46. THANKS TO ALL