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Lecture 35 - Design of Two-Way Floor Slab System

Lecture Goals. One-way and two-way slabSlab thickness, h . Comparison of One-way and Two-way slab behavior. One-way slabs carry load in one direction.Two-way slabs carry load in two directions.. Comparison of One-way and Two-way slab behavior. One-way and two-way slab action carry load in two directions..

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Lecture 35 - Design of Two-Way Floor Slab System

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    1. Lecture 35 - Design of Two-Way Floor Slab System April 23, 2003 CVEN 444

    2. Lecture Goals One-way and two-way slab Slab thickness, h

    3. Comparison of One-way and Two-way slab behavior

    4. Comparison of One-way and Two-way slab behavior

    5. Comparison of One-way and Two-way slab behavior

    6. Comparison between a two-way slab verses a one-way slab

    7. Comparison of One-way and Two-way slab behavior

    8. Comparison of One-way and Two-way slab behavior

    9. Comparison of One-way and Two-way slab behavior Economic Choices Flat Plate suitable span 20 to 25 ft with LL= 60 -100 psf Advantages Low cost formwork Exposed flat ceilings Fast Disadvantages Low shear capacity Low Stiffness (notable deflection)

    10. Comparison of One-way and Two-way slab behavior Economic Choices Flat Slab suitable span 20 to 30 ft with LL= 80 -150 psf Advantages Low cost formwork Exposed flat ceilings Fast Disadvantages Need more formwork for capital and panels

    11. Comparison of One-way and Two-way slab behavior Economic Choices Waffle Slab suitable span 30 to 48 ft with LL= 80 -150 psf Advantages Carries heavy loads Attractive exposed ceilings Fast Disadvantages Formwork with panels is expensive

    12. Comparison of One-way and Two-way slab behavior Economic Choices One-way Slab on beams suitable span 10 to 20 ft with LL= 60-100 psf Can be used for larger spans with relatively higher cost and higher deflections One-way joist floor system is suitable span 20 to 30 ft with LL= 80-120 psf Deep ribs, the concrete and steel quantities are relative low Expensive formwork expected.

    13. Comparison of One-way and Two-way slab behavior

    14. Two-Way Slab Design

    15. Two-Way Slab Design

    16. Two-Way Slab Design

    17. General Design Concepts

    18. General Design Concepts

    19. Equivalent Frame Method (EFM)

    20. Equivalent Frame Method (EFM)

    21. Method of Analysis

    22. Method of Analysis

    23. Method of Analysis

    24. Column and Middle Strips

    25. Minimum Slab Thickness for two-way construction

    26. Minimum Slab Thickness for two-way construction

    27. Minimum Slab Thickness for two-way construction

    28. Minimum Slab Thickness for two-way construction

    29. Minimum Slab Thickness for two-way construction

    30. Minimum Slab Thickness for two-way construction

    31. Definition of Beam-to-Slab Stiffness Ratio, a

    32. Definition of Beam-to-Slab Stiffness Ratio, a

    33. Beam and Slab Sections for calculation of a

    34. Beam and Slab Sections for calculation of a

    35. Beam and Slab Sections for calculation of a

    36. Minimum Slab Thickness for two-way construction

    37. Example - Slab

    38. Example - Slab

    39. Example - Slab

    40. Example – a calculations

    41. Example – a calculations

    42. Example – a calculations

    43. Example – a calculations

    44. Example – a calculations

    45. Example – a calculations

    46. Example – a calculations

    47. Example – a calculations

    48. Example – a calculations

    49. Example – a calculations

    50. Example – a calculations

    51. Example – a calculations

    52. Example – a calculations

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