Download - Circular slabs
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Circular Slab
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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 tube
wells4.Roof of a traffic control post at the
intersection of roads
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• In circular slab, Bending takes place in distinctly two perpendicular directions along the two spans.
• Reinforcement is provided in the form of a mesh of bars having equal area of cross section in both the directions, the area being equal to that required for the bigger of the radial and circumferential moments.
• However, if the stresses near the edge are not negligible, or if the edge is fixed, radial and circumferential reinforcement near the edge becomes essential.
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Circular slab• Circular slabs are more commonly used in the design of circular
water tank containers with flat bottom and raft foundations. • The analysis of stresses in these slabs is generally based on elastic
theory. Under uniformly distributed loads, these slabs deflect in the form of a saucer and develop radial and circumferential stresses. Tensile stresses develop on the convex surface and compressive stresses develop on the concave surface.
• Tensile stresses must be provided in the radial and circumferential directions near the convex surface.
• Alternatively, reinforcing bars can be provided in two mutually perpendicular directions instead of in the radial and circumferential directions.
• Normally, near the Centre of the slab, reinforcement is provided in the form of mutually right angle mesh; and near the edge of the slab, in the form of radial and circumferential bars.
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Simply supported slab with, uniformly distributed load
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Simply supported slab with, uniformly distributed load
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Fully restraint slab with uniformly distributed load
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Fully restraint slab with uniformly distributed load
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Simply supported slab with concentric load
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Simply supported slab with concentric load
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Simply supported slab with uniformly distributed load inside a concentric circle
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Simply supported slab with uniformly distributed load inside a concentric circle
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Simply supported slab with a circular hole and with uniformly distributed load
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Simply supported slab with a circular hole and with uniformly distributed load
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Simply supported slab with a circular hole and with concentric load
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Simply supported slab with a circular hole and with concentric load
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Simply supported slab with a circular hole and linearly varying distributed load
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Simply supported slab with a circular hole and linearly varying distributed load
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Simply supported slab with a circular hole and linearly varying distributed load