Liquid Retaining Structure

This article provides key information related to liquid retaining structure.

Concrete Grade

Design Concept

Elevated Service Reservoir

Intz Type ( Internal diameter max approximately 14.5 m)

A : Top dome ( rise = span / 7 to 8)

B: Top ring beam

C: Cylindrical wall

D: Middle ring beam ( platform not shown)

E: Conical dome

F: Bottom dome ( rise = span / 6 to 7)

G: Bottom ring beam

H: Shaft or Rigid frame

One optimum size configuration, cylindrical portion, Height (H), Diameter (D) and Volume (V)

V = (pi/8) x D^3 ; H = D/2

The Dome half-angle shall be less than 51.83 Degrees for no tension in the meridian direction

Intz tank with Internal column and slab ( Internal Intz tank with Internal column supporting slab and dome (diameter > 14.5 m)

A : Top dome ( rise = span / 7 to 8)

B: Ring beam

C: Slab ( oneway)

D: Cylindrical wall

E: Middle ring beam ( platform not shown)

F: Conical dome

G: Bottom dome ( rise = span / 6 to 7)

H: Shaft or Rigid frame

Cylindrical Tank

A: Roof slab ( Orthogonal direction rectangular beam or flat slab with or without drop/column head)

B: Internal Circular / Square column

C: Cylindrical wall

E: Bottom slab

F: Rectangular Beam

G: Rigid frame

Conical Tank

A: Domed roof ( or slab supported on beam spanning between internal and external wall)

B: Internal shaft

C: Ring Beam

D: Cylindrical wall

E: Conical

G: Bottom dome

References

1. Concrete Design Guide No. 1: Guidance on the design of liquid-retaining structures, The Structural Engineer, January 2015
2. PCA Circular Concrete Tanks without Prestressing