POST SLAB PRESENTATION FOR LEARNING BASIC STRUCTURAL SYSTEM OF A BUILDING.

A PRESENTATION ON POST SLAB STRUCTURAL SYSTEM .

BSMRSTU , ARCHITECTURE

1. Post slab structural system Group 05 19ARCH008 19ARCH041 18ARCH032 18ARCH029

2. Table of contents What is it History How it works Classifiacation Expression Span Size Column thickness Cantilever Punch/void in slab Position of stair Position of wall and opening 01 03 02 Overview of structural system Technical Details Case studies 04 WEAK POINTS & IMPROVEMENT

3. What is Post slab structure? The structural system in which the slabs are supported directly to the post. The slab is built monolithically with the supporting columns . which are arranged in such a manner that they form square or early square panels. Structural Member Post ( vertical load bearing member ) Slab ( Horizontal load bearing member ) Slab Post Slab Post

4. Historical Overview C.A.P Turner is the first inventor of post-slab system. In 1906 he built the first practical post-slab structure , Johnson- Bovey Building, in Minneapolis, Minnesota. The structural system is made famous by Le Corbusier after the first world war when rapid and low-cost constructions were needed.  Corb's solution was almost painfully simple: a standardised, two-storey house made up of concrete slabs supported on columns and a staircase. That was it – no walls, no rooms, just a skeleton.  Johnson- Bovey Building, in Minneapolis, Minnesota Le Corbusier – Dom Ino house Slab Post The first case in architectural history of a house designed as an open system

5. How it Works Columns are placed generally in square grid pattern. This spacing may lie within a range where it is economical. The load of the slab itself and other live load transfer to the post by slab. Both the load and live load which the post gets from the slab transfer to the ground by the post. Pointed load transferring mechanism.

6. Classification 1)Flat Plate Post Slab 2)Flat slab with column Head 3)Flat slab with column head and drop panel Post slab is structurally 2 type 1)Flat Plate 2)Flat slab Flat Plate Flat slab

7. Expression • Solid void relationship is strongly achieved • Posts are exposed • Expression of cantilever • Mass construction upon the post gives an impact of floating • Different types of massing.

8. 1. CLEAR SPAN : horizontal distance between internal faces of two v ertical supports 2. Effective span : horizontal distance between center points of two vertical support Span economic Span: 24’-26’ minimum Span: 30’

9. Span : Suitable span range from 20’-24’  Post position can terminate load bearing capacity as well as span limit . Slab Thickness : 5” to 12”  slab depth=  Span/33 Flat plate post slab   Slabs Post/column

10. Span : Suitable span range from 20’-40’  Post position can terminate load bearing capacity as well as span limit . Slab Thickness : 6” to 12”  Typical slab depth=  Span/36 Drop Panel :  Typical Thickness = 0.25X Slab Thickness Width : 0.33x Span Flat plate with drop post slab

11. The column strip in a  flat slab is the one put at the inside , while  center strip is put among two segment strips. In the level chunk, the  column strips are the center part of the section  and each side has a width equivalent to       of the shorter range.   The column strip is a portion of plan with a  width of 0.25 L1 or 0.25L2,  or the lower among them. The rest of the center part isolated by the  segments of the section is known as the middle strip. COLUMN STRIP & MIDDLE STRIP Column strip Column strip Middle strip Middle strip Column strip l/4 l/4 l/4 l/4 punch Column strip Middle strip Middle strip

12. COLUMN column thickness = L/15 not less then = 10”×10 ” L = span Slab Thickness: minimum Slab & thickness for  flat slab with drop panel =L/36 flat plate without drop panel =L/33 L= span

13. Cantilever Span: In post-slab system slab must be cantilevered Minimum cantilever = L/3 Maximum cantilever =L/2. For live Load=5’-8’ For dead load=12’

14. Punch: Middle strip can be punched at L/4 distance from column core lines. L/4 L/4 L/4 L/4

15. WALL POSITION Walls may be placed in any location and on any floor. walls were built on the column strip. STAIR POSITION From the central strip, you may make a stair. Cantilever as landing allows for the creation of stairs . OPENING Ribbon Windows that keep opening are available. Any type of opening, in any size, can be granted .

16. KEY FEATURES FOLLOWING THE 5 points of ARCHITECTURE : Pilotis Irregular plan Free façade Ribbon window Roof terrace

17. Case Study VILLA SAVOYE, POSSY, 1928-29, LE CORBUSIER 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.

18. FREE PLAN IN INTERIOR: THE FREE PLAN OR FREE INTERIOR PLANNING BY MEANS OF PARTITION WALLS SLOTTED BETWEEN THE SUPPORTS. Free flowing plan Columns Columns

19. SOLID VOID ORGANIZATION Solid Void Void Void Solid Solid

20. FREE COLUMN: Structural THE PILOTI, OR ELIMINATION OF THE GROUND STOREY WITH THE ELEVATION OF THE HOUSE ABOVE PILOTIS FREE STANDING CONCRETS POSTS. RIBBON WINDOW: THE STRIP WINDOW, OR PREFERENCE FOR RIBBON WINDOWS EXPRESS HORIZONTALITY IN WHOLE BUILDING. FREE FACADE: THE FACADE OF THE BUILDING IS ALSO INDEPENDENT OF ITS STRUCTURE. THE POST MAY BE SET BACK FROMTH FAÇADE INSIDE THE BUILDING THE ROOF TERRACE: A FLAT ROOF, USED ASA GARDEN TERRACE.

21. SPIRAL STAIRCASE: DYNAMIC AND NON-TRANSITIONAL RELATIONSHIP BETWEEN FLOOR-TO SPIRAL STAIR. RAMP RAMP TO ROOF GARDEN

22. Modern, sleek aesthetic with clean lines and smooth surfaces. Large, uninterrupted floor plates for spacious living areas. Customizable interior layouts to meet residents' preferences. Long-span floor plates offering panoramic views. Efficient structural system maximizing space utilization. Enhanced seismic performance for safety and stability. Case Study One At Palm Residential Building / SOMA Free facade

23. Free flowing plan ` Slab Post Post

24. Solid Void Ribbon windows columns

25. Gordon Parks Arts Hall Project Info Architects:  Valerio Dewalt Train Associates Location:  Chicago ,  United States Design Architect: Valerio Dewalt Train Associates Executive Architect: FGM Architects Area: 90000.0 ft2 Type:  Educational

26. Architects:  MO-O f Area:  38588  m² Year:  2018 Manufacturers:  Doka Shuttering, Evo, JSW Steel, NCL Industries, Rak ceramics, Shakti Hormann Limited Architects: Shantanu Poredi, Manisha Agarwal Quantity Surveying :  Dongre consultants UNIVERSITY VIJAYAWADA,INDIA

27. PUNCHES ON SLAB STAIR POSITION IN MIDDLE STRIP BEAMLESS COLUMN RIBBON WINDOWS & FLOARING EFFECT DOMINO EFFECT

28. `GROUND FLOOR PLAN CONCOURSE FLOOR PLAN

29. SECOND FLOOR PLAN FOURTH FLOOR PLAN

30. 27 ‘ 27’ 26’10” 26’10” 26’10” 26’10” 26’10”

31. WEAK TO RESIST LATERAL FORCE WEAK POINTS WEAK TO RESIST POST PUNCHING SHEAR LATERAL FORCE PUNCHING SHEAR

32. IMPROVING THE STRENGTH CONSIDER SHEAR WALLS Providing edge beams or shear walls around the perimeter of the slab can significantly increase its lateral load capacity. CONSIDER EDGE BEAM Providing edge beam at cantilevered portion can make the structure stronger. USE DROPPING PLATE ON COLUMN Providing drop plate on column can make an evenly distribution Of load from slab to column to decrease punching shear failure stronger.

33. Three models were basically analyzed in this study and the relative study of flat slab with and without shear wall was made and then compared with the conventional beam slab structure .Software used for the analysis purpose is E-tabs. The methodology is to achieve same value of deflection in flat slab with shear wall as the value of deflection attained in conventional frame and what percentage of shear wall is increased. So basically a comparison on the Wall Plan Density of the structure is also done in this study. PLAN OF CONVENTIONAL POST LINTEL STRUCTURE PLAN OF POST SLAB STRUCTURE WITH DEOP PLAN OF POST SLAB STRUCTURE WTH SHEAR WALL International Journal of Civil Engineering and Technology (IJCIET). (Year). Influence of silica fume and lime on the strength of concrete. International Journal of Civil Engineering and Technology, 9 (5), 105-116. Retrieved from https://iaeme.com/MasterAdmin/Journal_uploads/IJCIET/VOLUME_9_ISSUE_5/IJCIET_09_05_105.pdf

34. as conventional frame structure in x direction but more value in y direction whereas structure with pure flat slab gives value quite higher than these two structures. So we can say deduce that we need to add shear wall in direction parallel to y-direction as deflection values are already less than that of conventional slab in x direction. In order to control the value of deflection we add or increase the percentage of shear wall in the direction parallel to Y direction. nternational Journal of Civil Engineering and Technology (IJCIET). (Year). Influence of silica fume and lime on the strength of concrete. International Journal of Civil Engineering and Technology, 9 (5), 105-116. Retrieved from https://iaeme.com/MasterAdmin/Journal_uploads/IJCIET/VOLUME_9_ISSUE_5/IJCIET_09_05_105.pdf

35. IMPROVED PLAN OF POST SLAB STRUCTURE WTH SHEAR WALL Plan of Flat Slab with Shear Wall Structure after addition of shear wall in Y-direction Let’s investigate the comparison with the model with an increase in the Plan Wall Density. DEFLECTION RATE

36. 1.Leet, K. M., Uang, C. M., & Gilbert, A. M. (2013). Fundamentals of Structural Analysis. McGraw-Hill Education. 2. Williams, A. (2014). Structural Engineering Reference Manual. Professional Publications, Inc. 3. "Reiter, C. (2011, September 12). Gordon Parks Arts Hall. Architect Magazine. Retrieved from https://www.architectmagazine.com/project-gallery/gordon-parks-arts-hall_o " 4. "ArchDaily. (n.d.). One at Palm Residential Building / SOMA. Retrieved from https://www.archdaily.com/1015807/one-at-palm-residential-building-soma " 5. Spence, W. P., & Kultermann, E. (2015). Construction Materials, Methods and Techniques. Cengage Learning. REFERENCES

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