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
Specialist Civil Structural Engineer
2 年excellent article as usual..have a request.. wish to have another article about liquid seismic load calculation and application on elevated tanks please.
Design Engineer at Dipak Kulkarni
2 年You may want to add crackwidth criteria, chlorine attack on concrete (as water is generally mixed with chlorine till break point). Great job covering the basics thouugh!