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Circular slabs

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Circular Slab

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Circular slabs

1. 1. Circular Slab
2. 2. Introduction• Uses of Circular Slabs:1.Roof of a room or hall circular in plan2.Floor of circular water tanks or towers3.Roof of pump houses constructed above tubewells4.Roof of a traffic control post at theintersection of roads
3. 3. • In circular slab, Bending takes place indistinctly two perpendicular directions alongthe two spans.• Reinforcement is provided in the form of amesh of bars having equal area of crosssection in both the directions, the area beingequal to that required for the bigger of theradial and circumferential moments.• However, if the stresses near the edge are notnegligible, or if the edge is fixed, radial andcircumferential reinforcement near the edgebecomes essential.
4. 4. Circular slab• Circular slabs are more commonly used in the design of circularwater tank containers with flat bottom and raft foundations.• The analysis of stresses in these slabs is generally based on elastictheory. Under uniformly distributed loads, these slabs deflect in theform of a saucer and develop radial and circumferential stresses.Tensile stresses develop on the convex surface and compressivestresses develop on the concave surface.• Tensile stresses must be provided in the radial and circumferentialdirections near the convex surface.• Alternatively, reinforcing bars can be provided in two mutuallyperpendicular directions instead of in the radial and circumferentialdirections.• Normally, near the Centre of the slab, reinforcement is provided inthe form of mutually right angle mesh; and near the edge of theslab, in the form of radial and circumferential bars.
5. 5. Simply supported slab with, uniformlydistributed load
6. 6. Simply supported slab with, uniformlydistributed load
7. 7. Fully restraint slab with uniformlydistributed load
8. 8. Fully restraint slab with uniformlydistributed load
9. 9. Simply supported slab with concentricload
10. 10. Simply supported slab with concentricload
11. 11. Simply supported slab with uniformlydistributed load inside a concentric circle
12. 12. Simply supported slab with uniformlydistributed load inside a concentric circle
13. 13. Simply supported slab with a circular holeand with uniformly distributed load
14. 14. Simply supported slab with a circular holeand with uniformly distributed load
15. 15. Simply supported slab with a circularhole and with concentric load
16. 16. Simply supported slab with a circular holeand with concentric load
17. 17. Simply supported slab with a circular holeand linearly varying distributed load
18. 18. Simply supported slab with a circular holeand linearly varying distributed load
19. 19. Simply supported slab with a circular holeand linearly varying distributed load