Circular slabs
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Circular slabs are used for roofs that are circular in plan, floors of circular tanks or towers, and roofs over pump houses or traffic control posts. Bending occurs in two perpendicular directions for circular slabs. Reinforcement is provided as a mesh with equal area in both directions, sized for the larger of the radial or circumferential moments. Near edges, radial and circumferential reinforcement may be needed if edge stresses are significant or if the edge is fixed. Circular slabs are commonly used in water tanks, where they deflect into a saucer shape under uniform loads and develop tensile and compressive stresses radially and circumferentially.
Circular slabs
- 2. • Uses of Circular Slabs: 1. Roof of a room or hall circular in plan 2. Floor of circular water tanks or towers 3. Roof of pump houses constructed above tube wells 4. Roof of a traffic control post at the intersection of roads
- 3. • 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.
- 4. 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.
- 20. Thank you Mr. VIKAS MEHTA School of Mechanical and civil engineering Shoolini University Village Bajhol, Solan (H.P) [email protected] +91 9459268898