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HOLLOW CORE SLABS
- 1. Contoso Ltd. Structural Analysisand Design of Institutional Building with Hollow Core Slab
- 2. Contoso Ltd. OBJECTIVE • Toanalyze and design a multi –storey Institutional building with hollow core slab. • Analysis and design is done with the aid of Staad.pro Software.
- 3. Contoso Ltd. STAAD.Pro Software usedfor the analysis and design of the building. AUTOCAD 2016 Used for drafting and detailing of the designed structural elements
- 4. Contoso Ltd. Add afooter 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. Contoso Ltd. 5 Add afooter METHODFORPRETENSIONING
- 6. Contoso Ltd. Add afooter 6 PRESTRESSING OF CONCRETE
- 7. Contoso Ltd. 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. Contoso Ltd. 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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- 11. Contoso Ltd. DESIGNING FEATURES SLABSBEAMS COLUMNS STAIR CASE FOUNDATION
- 12. Contoso Ltd. HOLLOW CORE SLAB Ahollow 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
- 13. Contoso Ltd. Add afooter 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.
- 14. Contoso Ltd. Add afooter 14 Production Process Of Hollow core Slab Bed Preparation Stressing the strands Casting Storage and Curing Transportation to site Erection
- 15. Contoso Ltd. Add afooter 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
- 16. Contoso Ltd. Add afooter 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
- 17. Contoso Ltd. Add afooter 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.
- 18. Contoso Ltd. Add afooter 18 Detensioning and CuttingDETENSIONING 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.
- 19. Contoso Ltd. Add afooter 19 STORAGE AND CURING • Hollow core slabs are then stored & cured in the yard according to quality procedures & up to the specified time.
- 20. Contoso Ltd. Add afooter 20 TRANSPORTATION TO SITE • Transport is done by flat trailers, with slabs stacked horizontally, supported by timber planks & well secured to avoid transport damage.
- 21. Contoso Ltd. Add afooter 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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- 23. Contoso Ltd. 23 Add afooter REALWORLDEXAMPLE
- 24. Contoso Ltd. ○ Abeam 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
- 25. Contoso Ltd. 25 Add afooter TYPES OF BEAMS • Cantilever beams • Simple beams/fixed beams • Overhanging beams
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- 27. Contoso Ltd. 27 Add afooter REAL WORLD PICTURES
- 28. Contoso Ltd. COLUMNS Add afooter 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.
- 29. Contoso Ltd. TYPES OFCOLUMNS ○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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- 32. Contoso Ltd. ○A stairis 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
- 33. Contoso Ltd. 33 Parts ofStaircase: 1. Step 2. Tread 3. Rise 4. Handrail 5. Baluster 6. Newel Post 7. Run 8. Nosing 9. String or Stingers
- 34. Contoso Ltd. 34 Add afooter Types of Staircase Straight Staircase Dog Legged Staircase Quarter Turn Staircase Open Newel Staircase
- 35. Contoso Ltd. 35 Add afooter Three Quarter Turn Staircase Bifurcated Staircase Geometrical Staircase Circular Staircase
- 36. Contoso Ltd. 36 Add afooter CROSS-SECTION OF STAIRCASE
- 37. Contoso Ltd. ○Footings arestructural members used to support columns and walls to transmit and distribute their load onto the ground 37 FOOTINGS
- 38. Contoso Ltd. 38 Types ofFootings Wall Footing Isolated Footing Combined Footing
- 39. Contoso Ltd. 39 Add afooter Mat Footing Pile Footing
- 40. Contoso Ltd. 40 Add afooter CROSS-SECTION OF AN ISOLATED FOOTING
- 41. Contoso Ltd. 41 Add afooter TYPES OF FOOTINGS
- 42. Contoso Ltd. 42 Add afooter REAL WORLD PICTURES
- 43. Contoso Ltd. Add afooter 43 ACTIVITIES TO BE PERFORMED
- 44. Contoso Ltd. Calculation ofload, bending moments and shear forces Designing of HCS, beams, columns and footings Drawing of detailed structure Add a footer 44 ANALYSIS DESIGNING DRAWING
- 45. Contoso Ltd. ACTIVITY-1 IDENTIFICATION OFSLAB PANEL • Depending on the project requirements, in particular span and loading performance the most adequate and economical slab is selected.
- 46. Contoso Ltd. Hollow coreslabs are available in various range of depthslike 160, 200, 265, 320, 400, 450 and 500mm slabs. The longest spancan reach up to 18m Add a footer 46
- 47. Contoso Ltd. ACTIVITY-2 Calculation ofloads Add a footer 47 1. Dead load • Dead load of the walls • Dead load of slab • Floor finish • Total dead load of slab 2. Live Load • Class rooms, conference hall • Corridors, passages • Staircase and toilets
- 48. Contoso Ltd. 3. WindLoad Windloadsdependon the velocityof windat the locationof the structure, permeabilityof the structure, height of structure etc. Add a footer 48
- 49. Contoso Ltd. ACTIVITY-3 Design ofHC slab panels Add a footer 49 • As per is code 1348 2012 for prestressed concrete
- 50. Contoso Ltd. CONNECTION OFHC SLAB PANELS Add a footer 50
- 51. Contoso Ltd. ACTIVITY-4 LAYOUT OFSLAB Add a footer 51 • Complete layout of slab is done • Autocad 2020 is used
- 52. Contoso Ltd. ACTIVITY-5 DESIGN OFBEAMS 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.
- 53. Contoso Ltd. EXAMPLE OFSTAAD PRO DESIGN Add a footer 53
- 54. Contoso Ltd. SHEAR FORCEAND BENDING MOMENT DIAGRAMS Add a footer 54
- 55. Contoso Ltd. ACTIVITY-6 DESIGN OFFOOTINGS Add a footer 55 • Footings are designed by using Microsoft excel
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- 58. Contoso Ltd. 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
- 59. Contoso Ltd. CO-ORDINATOR ANDMENTOR Add a footer 59 ABDUL WAJID SIDDIQUI Coordinator & Assistant Professor, DCET
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