Design Of Prestressed Circular Water Tank 2u5n2j

DESIGN OF PRESTRESSED CIRCULAR WATER TANK:

DESIGN SPECIFICATIONS:

DIAMETER

: 100m

DEPTH

: 36m

CONCRETE GRADE

: M40

PERMISSIBLE COMP.STRESS UNDER TRANSFER

: 13N/mm2

MIN COMP STRESS UNDER WORKING PRESSURE

: 1N/mm2

LOSS IN PRESTRESS (assumed)

: 25%

ᶯ)

: 0.75

LOSS RATIO (

@CIRCULAR WINDING Reinforcement (assumed) Dia of bars used

: 16mm

Circular Prestress (fs) : 1000N/mm2 @VERTICAL PRESTRESSING Reinforcement (assumed) Dia of bars used

: 20mm

Vertical Prestress (fs) : 1500N/mm2

Storage level

: full

Base condition

: fixed base condition

DESIGN: STEP -1 Determination of ring tension and bending moment along the tank wall ( Nd & Mw) :

Mw = Coefficient x wH3 H2 / Dt = 362/ 100 x 0.15 = 86.4 Assuming a max value of 56.0, From IS3370 Part-4, Coefficient = 0.0023 Mw = 0.0023 x 10 x 363 = 1073.688 kN m/m

RING TENSION Nd = coefficient x W H R H2 / Dt = 56.0 Coeff = 0.838 Nd = 0.838 x 10 x 36 x 50 = 15084kN/m STEP-