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No. Mark Short Name Long Name1 DSW Self Wt Ringwall Selfweight2 DSA Str. Wt Structure Weight excluding Selfweight3 LL Live Load Live Load 4 EQE EQ Erection Tank Load for Erection5 EQO EQ Operation Tank Contant Load6 EQT EQ Test Tand Hydrotest Load7 W Wind Wind Load 8 EQ Seismic Seismic Load 9 IPO Internal-Op Internal Pressure - Operating
- Dead Load, Shell, Roof, & Ext.Structure Loads 14.37 kN/m
- Live Load 2.89 kN/m
- Uniform Load, Operating Condition 112.89
- Uniform Load, Hydrotest Load 123.93
- Base Shear due to Wind 80.71 kN
- Reaction due to Wind 2.09 kN/m
- Moment Due to Wind 533.15 kN-m
- Base Shear due to Seismic Load 807.26 kN
- Reaction due to Seismic Load 17.16 kN/m
- Moment Due to Seismic Load 4492.39 kN-m
: DL
: LL
: WO kN/m2
: Wh kN/m2
: FW
: RW
: MW
: FS
: RS
: MS
FOUNDATION LOADING
WEIGHT SUMMARY
DESIGN OF RING WALL ANNULAR RAFTMaterialsGrade of Concrete 25 N/sq.mmGrade of Steel 415 N/sq.mmSize of Ring WallWidth of Ring Wall 0.65 mCentral Diameter of Ring Wall, C 3.12 mDepth of Ring Wall above FGL 0.60 mDepth of Foundation above raft 2.00 mDepth of Raft 0.40 mSafe bearing capacity 100 kN/sq.mUnitweight of Soil 18 kNEmpty Weight of Tank 39 kNOperating Weight 234 kNWind moment 12.5 kNmSeismic Moment 55 kNmShear at Base Due to Wind 8 kNShear at Base Due to Seismic 32 kNArea of Ring Wall 6.38Weight of Ring Wall above Raft 398.112 kNWieght of soil above Raft 264.60 kNTotal Vertical Load on Raft 896.71 kNTotal Moment due to wind at Raft 30.1 kNmTotal Moment due to earthquake at Raft 125.4 kNmWidth of Raft 1.4 mExternal Diameter of Raft, D1 4.522 mInternal Dia meter of Raft, D2 1.722 mWeight of Ring WallCheck for Bearing PressureArea of Raft 13.73 sq.mSection Modulus of Raft 8.89 cu.mMax Bearing Pressure under the RaftP/A+M/S 82.8 kN/sq.mIncreaseing SBC @ 25% 125 kN/sq.mPact<1.25SBC,Hence SafeDesign MomentsModified uniform pressurep = p1+0.5p2 74.06 kN/sq.mOuter Radius of Raft, a 2.261 mInner Radius of Raft, b 0.861 mCentral Radius of Raft, c 1.561 mAs per clause no. 5.1.2 of IS :11089-1984At radius, r = 0.861m (Inner Face of Raft)pa^2/16 23.6627 kN
0.14501
1.000
0.145
b2/a2
b2/r2
r2/a2
0.477Mt -82.717 kNmMr 59.259 kNmAt radius, r = 2.261m (Outer Face of Raft)pa^2/16 23.6627
0.14501
0.145c/r 0.690Mt -61.143 kNmMr 92.5686 kNmMaximum Moments for DesignMt 82.7173 kNmMr 92.5686 kNmCheck for Effective Depth