sump design_rajesh.xls
4
TAMEER CONSULTING ASSOCIATES DESIGN OF SUMP UNDER GROUND Angle of internal friction 38 0.66 radians coeff. Of active pressure 0.24 length of sump (L) 4 m width of the sump (W) 2.5 m height of sump (H) 3.35 m Long wall L/H 1.6 Two way Short wall W/H 1.34 Two way Density of soil 18 kN/m3 Density of water 10 kN/m3 Design of Walls dreq 75.04 mm min. Ast 390.00 mm2 D prov 230.00 mm dprov 195.00 mm a) tank empty, saturated soil pressure b)tank full, no earth fill h 2.3 m Cantilever projectio 2.3 m Pa 12.50 kN/m2 39.88 kN/m2 10.50 kN/m2 33.50 kN/m2 x 80.00 mm at supports at centre Bottom Distr. Ste at support at centre Bottom Distr. Steel B.M. 6.51 3.25 6.65 4.63 1.89 5.58 kN-m Ast req 254.63 127.31 390.00 390.00 251.06 390.00 390.00 390.00 mm2 Consider 12 12 12 12 12 12 12 12 mm dia. O Spacing req 443.94 887.88 289.85 289.85 450.25 289.85 289.85 289.85 mm spacing prov 100.00 150.00 200.00 200.00 100.00 200.00 200.00 200.00 mm c/c Design of Bottom Slab assume base slb thickness 300 mm upward pressure Pu 36.5 Total upward pressure 365 Total Downward pressure Wt. of walls 326.63 Lx Ly provide a projection of 0.60 m 5.66 4.16 wt of base slab 144.30 total load 470.93 F.S against floatation 1.29 SAFE upward pressure 36.50 self wt of slab 7.50 Net upward pressure 29.00 wt. of soil on projections 36.18 wt. of wall per m 19.26 net unbalanced force per m 40.96 Pa 59.81 B.M at cantilever 79.10 B.M at Centre -31.21 d req 261.58 D prov 300.00 mm d prov 260.00 mm Ast required at supports 2320.63 mm2 provide 16 spacing 86.60 spacing pro 150 mm c/c bottom face Ast required at centre -915.50 provide 16 spacing -219.51 spacing pro 100 mm c/c top face Distribution steel req. 300 mm2 provide 10 spacing 261.67 spacing pro 200 mm c/c both faces FOR REFERENCE ONLY, DO NOT USE FOR DESIGN
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Transcript of sump design_rajesh.xls
TAMEER CONSULTING ASSOCIATES
DESIGN OF SUMP UNDER GROUND
Angle of internal friction 38 0.66 radianscoeff. Of active pressure 0.24
length of sump (L) 4 mwidth of the sump (W) 2.5 mheight of sump (H) 3.35 mLong wall L/H 1.6 Two wayShort wall W/H 1.34 Two wayDensity of soil 18 kN/m3Density of water 10 kN/m3
Design of Wallsdreq 75.04 mm min. Ast 390.00 mm2D prov 230.00 mmdprov 195.00 mm \moment coeff
Momenta) tank empty, saturated soil pressure b)tank full, no earth fill Design moment
h 2.3 m Cantilever projection 2.3 m Eff. Depth requiredPa 12.50 kN/m2 39.88 kN/m2 10.50 kN/m2 33.50 kN/m2 Eff. Depth provided
x 80.00 mm
at supports at centre Bottom Distr. Steel at supports at centre Bottom Distr. SteelB.M. 6.51 3.25 6.65 4.63 1.89 5.58 kN-m
Ast req 254.63 127.31 390.00 390.00 251.06 390.00 390.00 390.00 mm2Consider 12 12 12 12 12 12 12 12 mm dia. Of barsSpacing req 443.94 887.88 289.85 289.85 450.25 289.85 289.85 289.85 mmspacing prov 100.00 150.00 200.00 200.00 100.00 200.00 200.00 200.00 mm c/c
Design of Bottom Slabassume base slb thickness 300 mmupward pressure Pu 36.5Total upward pressure 365Total Downward pressureWt. of walls 326.63 Lx Lyprovide a projection of 0.60 m 5.66 4.16wt of base slab 144.30total load 470.92F.S against floatation 1.29 SAFEupward pressure 36.50self wt of slab 7.50Net upward pressure 29.00wt. of soil on projections 36.18wt. of wall per m 19.26net unbalanced force per m 40.96Pa 59.81B.M at cantilever 79.10B.M at Centre -31.21d req 261.58D prov 300.00 mmd prov 260.00 mmAst required at supports 2320.63 mm2provide 16 spacing 86.60
spacing prov 150 mm c/c bottom faceAst required at centre -915.50provide 16 spacing -219.51
spacing prov 100 mm c/c top faceDistribution steel req. 300 mm2provide 10 spacing 261.67
spacing prov 200 mm c/c both faces
FOR REFERENCE ONLY, DO NOT USE FOR DESIGN
D11
arch2: Add condition
D12
arch2: add condition
A23
arch2: For backfilled, sandy and other weak soils
Long wall Short wallVertical Horizontal Vertical Horizontal
End Span End Span End Span End Span0.042 0.031
TAMEER CONSULTING ASSOCIATES
DESIGN OF SUMP (UNDER GROUND)
Project: TEST Designer: XXXXXXXFile Name: TEST Date:
Angle of internal friction 36 0.63 radiansCoeff. Of active pressure 0.26
Length of sump (L) 3.50 m Type of soil: 1Width of the sump (W) 2.13 mHeight of sump (H) 2 mLong wall L/H 1.75 Two WayShort wall W/H 1.07 Two WayDensity of soil 18Density of water 10
Design of Walls
Cantilever ht (h) 1 m Min. Ast 300.00Pressure at h from ba 12.08 Pressure at base 24.15
Long wall Short wallHorizontal Vertical Cantilever Vertical Horizontal Cantilever
End Span End Span vertical Distrib. End Span End Span vertical Distrib.Moment coeff. 0.042 0.031 0.024 0.032 0.042 0.031 0.024 0.032Bending Moment 6.21 4.59 1.16 1.55 4.03 6.21 4.59 1.32 1.76 4.03 kN-mDesign moment 9.32 6.88 1.74 2.32 6.04 9.32 6.88 1.98 2.64 6.04 kN-mEff. Depth required 89.79 77.14 38.79 44.79 72.27 89.79 77.14 41.39 47.79 72.27 mmEff. Depth provided 150 150 150 150 150 150 150 150 150 150 150 150 mmAst required 473.96 349.83 300.00 300.00 307.07 300.00 473.96 349.83 300.00 300.00 307.07 300.00Provide dia. Of bars 10 10 10 10 10 10 10 10 10 10 10 8Spacing required 166 224 262 262 256 262 166 224 262 262 256 167 mmSpacing provided 100 100 150 150 150 150 150 150 150 150 150 150 mm c/c
Design of Bottom Slab
Assume base slab thickness 300 mm B.M. at cantilever 34.10 Lx LyUpward pressure 23 B.M. at Centre -13.83 4.40 3.03 mTotal upward pressure 171.80 Effective depth required 171.75Total Downward pressure Overall depth provided (D) 250.00 mmWeight of walls 169.02 210.00 mmProvide a projection of 0.30 m Ast required at supports 1238.63 mm2Weight of base slab 84.07 provide 16 spacing 162.24Total load 253.10 spacing prov 150 mm c/c bottom faceF.S against floatation 1.47 SAFE Ast required at centre -502.29Upward pressure 23.00 provide 16 spacing -400.09Self Weight of slab 7.50 spacing prov 200 mm c/c top faceNet upward pressure 15.50 Distribution steel req. 250 mm2Wt. of soil on projections 10.80 provide 8 spacing 200.96Wt. of wall per m 7.50 spacing prov 200 mm c/c both facesNet unbalanced force per m 33.19
kN/m2
kN/m3
mm2
mm2 per mmm ø
Hence dprov
A21
wall design: In wall 1m from base acts as cantilever and rest acts as slab(oneway or two way)
B21
wall design: In wall 1m from base acts as cantilever and rest acts as slab(oneway or two way)
F21
Ast.min: min. Ast required depends on Effective depth provided.
A27
Moment coeff.: Enter the moment coefficients from IS456, based on Ly/Lx ratio.
Pa 36.23
