1 / 44

Lecture 35 - Design of Two-Way Floor Slab System

Lecture Goals. Direct Design MethodExample of DDM . Direct Design Method for Two-way Slab. Minimum of 3 continuous spans in each direction. (3 x 3 panel)Rectangular panels with long span/short span 2. Method of dividing total static moment Mo into positive and negative moments.. Limitation

karah
Download Presentation

Lecture 35 - Design of Two-Way Floor Slab System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Lecture 35 - Design of Two-Way Floor Slab System April 15, 2001 CVEN 444

    2. Lecture Goals Direct Design Method Example of DDM

    3. Direct Design Method for Two-way Slab Minimum of 3 continuous spans in each direction. (3 x 3 panel) Rectangular panels with long span/short span 2

    4. Direct Design Method for Two-way Slab

    5. Direct Design Method for Two-way Slab

    6. Direct Design Method for Two-way Slab For panels with beams between supports on all sides, relative stiffness of the beams in the 2 perpendicular directions. Shall not be less than 0.2 nor greater than 5.0

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

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

    9. Two-Way Slab Design

    10. Two-Way Slab Design

    11. Two-Way Slab Design

    12. Basic Steps in Two-way Slab Design Choose layout and type of slab. Choose slab thickness to control deflection. Also, check if thickness is adequate for shear. Choose Design method Equivalent Frame Method- use elastic frame analysis to compute positive and negative moments Direct Design Method - uses coefficients to compute positive and negative slab moments

    13. Basic Steps in Two-way Slab Design Calculate positive and negative moments in the slab. Determine distribution of moments across the width of the slab. - Based on geometry and beam stiffness. Assign a portion of moment to beams, if present. Design reinforcement for moments from steps 5 and 6. Check shear strengths at the columns

    14. Minimum Slab Thickness for two-way construction

    15. Distribution of Moments

    16. Distribution of Moments

    17. Distribution of Moments

    18. Column Strips and Middle Strips

    19. Column Strips and Middle Strips

    20. Column Strips and Middle Strips

    21. Positive and Negative Moments in Panels

    22. Moment Distribution

    23. Positive and Negative Moments in Panels

    24. Longitudinal Distribution of Moments in Slabs

    25. Distribution of M0

    26. Moment Distribution

    27. Transverse Distribution of Moments

    28. Transverse Distribution of Moments

    29. Transverse Distribution of Moments

    30. Distribution of M0

    31. Factored Moment in Column Strip

    32. Factored Moment in an Interior Strip

    33. Factored Moment in an Exterior Panel

    34. Factored Moment in an Exterior Panel

    35. Factored Moment in Column Strip

    36. Factored Moment in Column Strip

    37. Factored Moment in Column Strip

    38. Factored Moments

    39. Factored Moments

    40. ACI Provisions for Effects of Pattern Loads

    41. ACI Provisions for Effects of Pattern Loads

    42. Reinforcement Details Loads

    43. Reinforcement Details Loads

    44. Minimum extension for reinforcement in slabs without beams(Fig. 13.3.8)

More Related