HOLLOW CORE SLABS

This is a presentation made by me and my colleagues as a mini project in my final year of the engineering

1. Structural Analysis and Design of Institutional Building with Hollow Core Slab

2. OBJECTIVE To analyze and design a multi –storey Institutional building with hollow core slab. Analysis and design is done with the aid of Staad.pro Software.

3. STAAD.Pro Software used for the analysis and design of the building. AUTOCAD 2016 Used for drafting and detailing of the designed structural elements

4. Add a footer 4 PRESTRESSED CONCRETE What is prestressed concrete? Prestressed concrete is a type of concrete in which internal stresses are induced to counteract extract stresses. Prestressing is a method in which compression force is applied to the reinforced concrete section. The effect of prestressing is to reduce the tensile stress in the section to the point till the tensile stress is below the cracking stress. Thus the concrete does not crack.

5. 5 Add a footer METHOD FOR PRETENSIONING

6. Add a footer 6 PRESTRESSING OF CONCRETE

7. Hollow Core Slab Hollow core slab is a precast, or a prestressed concrete component having holes and strands It is also called as a Voided Slab HCS units are the most useful elements of floor construction in multi- storey building & residential apartments.

8. SITE DETAILS G+6 Institutional building Site is located at Darussalam, Nampally . Plot Area: 2742 Sq. mt Ground: 11713 Sq. mt Total height: 28.2 mt

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10. DESIGNING FEATURES SLABS BEAMS COLUMNS STAIR CASE FOUNDATION

11. HOLLOW CORE SLAB A hollow core slab refers to a precast slab that is prepared using pre stressed concrete . Benefits include It is generally used in the construction of floors for high rise apartments or multi storey buildings. They consume lesser raw material & possess higher concrete strength, are structurally efficient, have reduced thickness . Add a footer 12

12. Add a footer 13 ADVANTAGES OF HOLLOW CORE SLAB Remarkably lower price when compared to other Longer span & greater loads than conventional slabs of the same thickness. No need for scaffolding Speed and ease of construction High strength Light weight and durable Fire Resistance and sound insulation Reduced on site labor Prefinished ceilings construction Preexisting longitudinal holes that can be used as conduits.

13. Add a footer 14 Production Process Of Hollow core Slab Bed Preparation Stressing the strands Casting Storage and Curing Transportation to site Erection

14. Add a footer 15 BED PREPARATION The Pre stressing steel beds are cleaned thoroughly & slightly oiled to allow easy stripping Steel strands are then laid & fixed at both ends

15. Add a footer 16 STRESSING OF STRANDS The strands are stressed one by one, under strict quality control. The stressing forces, no. of strands & their position are all determined by slab design

16. Add a footer 17 CASTING AND AUTOMATIC EXTRUSION In order to meet the durability & strength for slab, top quality concrete is batched & transported to extruder. which compacts it, then extrudes the hollow core section continuously.

17. Add a footer 18 Detensioning and Cutting DETENSIONING AND CUTTING 18 hrs later, when quality checks confirm that required concrete strength has been reached, strands are detensioned . PSC concrete bed is cut into different elements according to design.

18. Add a footer 19 STORAGE AND CURING Hollow core slabs are then stored & cured in the yard according to quality procedures & up to the specified time.

19. Add a footer 20 TRANSPORTATION TO SITE Transport is done by flat trailers, with slabs stacked horizontally, supported by timber planks & well secured to avoid transport damage.

20. Add a footer 21 ERECTION Hollow core slabs are lifted from the trailers on site by a special spreader beam and lifting belts. Up to 600 sq. mt. of Hollow core slabs can be erected by one team in one day making it fastest system available

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22. 23 Add a footer REAL WORLD EXAMPLE

23. A beam is a structural element that is capable of withstanding load primarily by resisting against bending Main function of the beams are to transfer loads from the structure onto columns and foundation 24 Add a footer BEAMS

24. 25 Add a footer TYPES OF BEAMS Cantilever beams Simple beams/fixed beams Overhanging beams

25. 26 CROSS-SECTION OF A BEAM

26. 27 Add a footer REAL WORLD PICTURES

27. COLUMNS Add a footer 28 A structural member subjected to axial compressive forces is called a column Normally, columns carry heavy compressive loads Columns are used in concrete and steel buildings.

28. TYPES OF COLUMNS Long Columns When the length of column is more as compared to its c/s area 29 Short columns When the length of column is less than compared to its c/s area, it is called as strut Intermediate Length of column is between 4d<L<30d

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31. A stair is a system of steps by which people and objects may pass from one level of a building to another level It divides the large vertical distance into number of part distances called as steps 32 Add a footer STAIRCASE

32. 33 Parts of Staircase: Step Tread Rise Handrail Baluster Newel Post Run Nosing String or Stingers

33. 34 Add a footer Types of Staircase Straight Staircase Dog Legged Staircase Quarter Turn Staircase Open Newel Staircase

34. 35 Add a footer Three Quarter Turn Staircase Bifurcated Staircase Geometrical Staircase Circular Staircase

35. 36 Add a footer CROSS-SECTION OF STAIRCASE

36. Footings are structural members used to support columns and walls to transmit and distribute their load onto the ground 37 FOOTINGS

37. 38 Types of Footings Wall Footing Isolated Footing Combined Footing

38. 39 Add a footer Mat Footing Pile Footing

39. 40 Add a footer CROSS-SECTION OF AN ISOLATED FOOTING

40. 41 Add a footer TYPES OF FOOTINGS

41. 42 Add a footer REAL WORLD PICTURES

42. Add a footer 43 ACTIVITIES TO BE PERFORMED

43. Calculation of load, bending moments and shear forces Designing of HCS, beams, columns and footings Drawing of detailed structure Add a footer 44 ANALYSIS DESIGNING DRAWING

44. ACTIVITY-1 IDENTIFICATION OF SLAB PANEL Depending on the project requirements, in particular span and loading performance the most adequate and economical slab is selected.

45. Hollow core slabs are available in various range of depths like 160, 200, 265, 320, 400, 450 and 500mm slabs. The longest span can reach up to 18m Add a footer 46

46. ACTIVITY-2 Calculation of loads Add a footer 47 Dead load Dead load of the walls Dead load of slab Floor finish Total dead load of slab Live Load Class rooms, conference hall Corridors, passages Staircase and toilets

47. 3. Wind Load Wind loads depend on the velocity of wind at the location of the structure, permeability of the structure, height of structure etc. Add a footer 48

48. ACTIVITY-3 Design of HC slab panels Add a footer 49 As per is code 1348 2012 for prestressed concrete

49. CONNECTION OF HC SLAB PANELS Add a footer 50

50. ACTIVITY-4 LAYOUT OF SLAB Add a footer 51 Complete layout of slab is done Autocad 2020 is used

51. ACTIVITY-5 DESIGN OF BEAMS AND COLUMNS Add a footer 52 Designing is carried out using STAAD PRO The nodes were assigned and the corresponding beams were added The columns were produced by translational repeat The section properties and support details were added. Load case details were assigned and analysis were done.

52. EXAMPLE OF STAAD PRO DESIGN Add a footer 53

53. SHEAR FORCE AND BENDING MOMENT DIAGRAMS Add a footer 54

54. ACTIVITY-6 DESIGN OF FOOTINGS Add a footer 55 Footings are designed by using Microsoft excel

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57. Team MOHD. ZAHED FAROOQUI 160316732062 B.E. CIVIL MOHD ABDUL MUJEEB 160316732100 B.E. CIVIL MOHD. RAZA 160316732066 B.E. CIVIL Add a footer 58 SYED AHMED WASIF ALI 160316732096 B.E.CIVIL

58. CO-ORDINATOR AND MENTOR Add a footer 59 ABDUL WAJID SIDDIQUI Coordinator & Assistant Professor, DCET

59. Thank You