Design of Water Tank using SAP2000

• Unit = lb-ft.

New Model

• Grid. Cylinder R= 5, θ = 9, z = 5. Along, r = 5.93, θ = 4.5, z = 13. Edit Z last value = 49.

• Draw beams in 2nd storey.

• Edit > Replicate parallel to Z-axis. Z = 13, number = 2.

• Draw edge beam in 1st storey.

• Select beams.

• Edit > replicate parallel to z-axis. Z = 13, No.= 1

• For ring beam.

Define > co-ordinate. t = 0, 11.25, 22.5 ............. 360

• Draw one element on one grid line. Select it and replicate. Radial along Z-axis. θ = 11.25, No. 31.

• Select all beams in this storey.

• Select insertion point to center.

• Draw single element of area.

• Select area.

Assign > Area > Local axis, 5.625,

• Select area and replicate 31 No & θ = 11.25

• Tz plane select.

• Draw walls.

• Select walls.

• Edit > auto mesh  1-2 = 2,  1-3 = 10

Define

• Define > joint pattern, hydropath

• Define > load cases. Name = hydro water pressure = type

• Define frame section. Define B15 x 12, C12 x12

• Define > area section. Slab, top slab, wall

• Select beams, assign B 15 x 12

• Select column assign C12 x 12

• Select tank base, assign slab

• Select wall

Assign

• Assign > joint pattern hydropath, C = 1, D = -49

• Select > get previous selection

• Assign > area load > surface pressure, Load = hydro, face = 5. By joint pattern. Name = hydropath. Multipliers = 62.4

• Add to existing load

• Select slab. Assign load= 62.4 lb/ft²

Analyze

• Analyze > run analysis, model “DO NOT RUN”

• Display > show forces/stresses > hydro. Check it for hoop stress

Design (Design Check & Area of Steel)

• Design > concrete frame design > display design combo. UDCON1, UDCON2

• Design > concrete frame design > start design/check

• Design > concrete frame design > verify all members passed

• Design > concrete frame design > display design info

• Select longitudinal reinforcement.

• Design slab, top slab, wall by getting AST1, AST2, beams and columns.