RCC Design_Box Culvert
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Transcript of RCC Design_Box Culvert
Beam Design
Beam Datawidth 200 mmdepth 600 mm d' 36 mm .= cc+ sdia + mdia/2
15 mm eff depth 565 mm .= d - d'
Material Grades
Concrete 20 MPaSteel 415 MPa
Moment 123 KN-m 1.93xumax 270 .= (700/(1100 * (0.87 * fy)) * dMulim 176 .= 0.36*fck*b*xumax*(d-(0.42*xumax))
2.76
Beam is designed as Singly Reinforced Beam
Area of Steel Tension (Ast) Compr (Asc)Percentage 0.613 % ------- Refer Table 2 SP 16 pg 48Area of Steel 692 sqmm
Tension Reinforcement Type Bar dia Nos Area of Steel
Layer 1 25 mm 2 982 sqmmLayer 2 16 mm 2 402 sqmmLayer 3 - 2
Total Steel Provided 1384 sqmm 1.226 %
Provided Steel OK
Compression ReinforcementType Bar dia Nos Area of Steel
Layer 1 12 mm 2Layer 2 -Layer 3
Total Steel Provided #VALUE!
Shear Force (Vu) 200 KNζv 1.771 .=Vu / (b * d)ζc 0.562 Refer Table 61 SP 16 pg 179ζcmax 2.8 Refer Table J SP 16 pg 175
Type Bar Dia Nos Area of SteelLayer 1 16 mm 2 402 sqmmLayer 2 12 mm 4 452 sqmmLayer 3 -
Total Steel Provided 855 sqmm 0.757 %
Sectional Dimensions OKShear Reinforcements required
Type of stirrup 2 leggedStirrup diameter 8 mmSpacing 150 c/c
clear cover to main reinf.
Mu/bd2
Mulim/bd2
or =(0.85*√(0.8*fck)*√(1+5β)-1)) / (6β)
Steel Calculation
Grade Check7.1
SRB DRBa 0.75 a 0.75b -3.611 b -3.611c 1.930 c 2.762-p 0.613 -p 0.955
Ast 692 .=(p*b*d)/100 Astlim 1079 .=(p*b*d)/100
Mu2 -53 .=Mu - MulimAst2 -278 .=Mu2/((0.87*fy)*(d-d'))Ast 801 .=Astlim+Ast2
0.0629 d'/d 0.100.1 fsc 353 Refer Table F SP 16 pg 13
fcc 8.92 .=0.466*fckAsc -291 .=Mu2/((fsc-fcc)*(d-d'))
Min steel % 0.205 .=0.85% / fyAst 692Asc -291
Min Steel 231 .=(0.85*b*d) / fyMax Steel 4516 .=0.04*b*d)
Ast 692Asc
Shear Calculations
Pt provided 0.757 .=(Ast*100)/(b*d)Pc provided .=(Asc*100)/(b*d)
β 3.068 .=(0.8*fck)/(6.89*Pt)
Shear Capacity of Concrete (Vs) 63 .=ζc*b*dShear Stg to be caried by Stirrup (Vus) 137 .=Vu-Vs
Spacingactual req 150 .=(Asv*0.87fy*d)/Vus
min 454 .=(Asv*0.87fy)/(b*0.4)max 423 .=0.75dmax 300 .=300mm
.=(0.87435/100) * (fy/fck)2 .=(0.87435/100) * (fy/fck)2
.=(0.87/100) * (fy) .=(0.87/100) * (fy)
.=Mu/bd2 .=Mulim/bd2
.=-(b±√(b2-4ac))/2a .=-(b±√(b2-4ac))/2a
pro
vid
e t
he
le
ast
of
the
4
Column Design
Design LoadsLoad Pu 2000 KN
Moment Mu 20 KN-m
Column Datawidth b 200 mmdepth d 200 mmlength l 3.00 meters
GradeConcrete fck 20 MPa
Steel fy 415 MPa
Pu/(fckbd) 2.50 Minimum eccentricity0.01 ex 1.27 mm OK
d'/d 0.05 ey 1.27 mm OK
Refer Chart 31 of SP 16, Page no: 116
pt/fck 0.18
pt 3.60%Ast 1440 sqmm
Number of bars dia nos ast
25 mm 4 1963 sqmm ● ● ● ● ● ● 4- ###
20 mm 4 1257 sqmm 4- ###
20 mm 4 1257 sqmm ● ● ● ● ● ● 4- ###
Total 12 4477 sqmm
Steel provided OK
Mu/(fckbd2)
04/17/2023 Page 5 of 41
Column Design
Load Moment Column Data GradeDesign Constants
Ast Req RemarkArea of Steel
Check Figd'/d Type 1 Type 2 Total Reinf Provided
1 - - C1 R 1500 KN 30 KN-m 30 KN-m 200 mm 750 mm 750 mm 50 mm 3.60 m 20 MPa 415 MPa 0.50 0.01 0.1 0.02 0.40% 600 sqmm 1200 sqmm 4 12 mm 452 sqmm 2 12 mm 226 sqmm 6 679 sqmm
Sl No.
Grid No
Col Nos. Col type
Col Shape
Design
Paramenters
Final Ast
RequiredPu/(fckbdl) Mu/(fckbdl2)
Ast less than
min Ast req.
Steel provided NOT OK
Slab Design
Slab thickness t 150 mm Sunken Depth 325 mm
fck 20 MPa
fy 415 MPa
Loading
Slab Load Sunken Slab Load
Dead Load DL 3.750 KN/m Dead Load DL 3.750 KN/m
Live Load LL 2.000 KN/m Filler Load FL 5 KN/m
Finishes Load WL 1.000 KN/m Live Load LL 3.0 KN/m
Total Load Ws 6.750 KN/m Finishes Load WL 1.0 KN/m
Factored Load Wsu 10 KN/m Total Load Wsk 12.37 KN/m
Factored Load Wsku 19 KN/m
Slab Data
Slab Type Regular
Load 10 KN/m
Longer Span (ly) 9.50 m ly/lx ratio 2.02
Shorter Span (lx) 4.70 m Slab type -
Loading on edges one way two way
24 KN/m .=w*lx/2
.=w*lx/3
Moments one way two way
Mx 28 KN-m
Thickness Check OK .=Mulim > Mux or Muy
Deflection 10 mm
Area of SteelAstx Refer Chart 4 SP 16 pg 21 or
667 sqmm Refer Table 5-44 SP 16 pg 51-80
Spacing required in mm
x y x y x y x x
75 c/c 118 c/c 170 c/c 301 c/c
.=ast of bar*1000/ast req
x y
Concrete
Steel
Wlonger .=(w*lx/2) + (1-(1/3)*(lx/ly)2)
Wshorter
.=w*lx2/ 8 .=αx * w*lx2
.=αy * w*lx2
.= 5*W*l4/(384EI)
8# 10# 12# 16#
Final Ast provided
Design Calculations
ONE WAY TWO WAYa 0.75 a 0.75
b -3.611 b -3.611
cx 1.654 cy #VALUE!
-px 0.513 -py #VALUE!
Ast 667 .=(p*b*d)/100 Ast #VALUE! .=(p*b*d)/100
Min Ast %0.12 180
Interpolation
Tabl
e 26
IS 4
56 p
g 91
1 0.056
ly/lx 1.1 0.064
1.2 0.072
0.00 0.00 2.02 #N/A #N/A #N/A 0.056 1.3 0.079
1.4 0.085
1.5 0.089
2 0.107
xumax 62 .= (700/(1100 * (0.87 * fy)) * d
Mulim 47 KN-m .= 0.36*fck*b*xumax*(d-(0.42*xumax))
2.76
1.65
#VALUE!
E 2.24E+07
I 2.81E-04Defln 10.23
.=(0.87435/100) * (fy/fck)2 .=(0.87435/100) * (fy/fck)2
.=(0.87/100) * (fy) .=(0.87/100) * (fy)
.=Mu/bd2 .=Mu/bd2
.=-(b±√(b2-4ac))/2a .=-(b±√(b2-4ac))/2a
mm2
αx αylower value
upper value
exact value
lower value
upper value
interptn. value
Mulim/bd2
Mux/bd2
Muy/bd2
.= bd3/12
.= 5*W*l4/(384EI)
Slab thickness t 150 mm
fck 20 MPa
fy 415 MPa Sunken Depth 450 mm
Loading
Slab Load Sunken Slab Load
Dead Load DL 3.75 KN/m Dead Load DL 3.75 KN/m
Live Load LL 3.00 KN/m Filler Load FL 6.39 KN/m
Floor Finish FF 1.00 KN/m Live Load LL 3.00 KN/m
Other Load OL 0.00 KN/m Floor Finish Load WL 1.00 KN/m
Total Load Ws 7.75 KN/m Total Load Wsk 14.14 KN/m
Factored Load Wsu 12 KN/m Factored Load Wsku 21 KN/m
Design & Reinforcement Details of Slabs
Slab Data
ly/lx
Sla
b ty
pe Loading on edges Moments Area of SteelSpacing required in mm
Sla
b ty
pe
Sla
b N
ame
Sl.No Sl. Id ThicknessLoad
Wsu / Wsku ly lx Mx Astx x y x y x y x y
1 Regular 150 mm 12 KN 7.20 m 3.00 m 2.40 - 18 KN/m 14 KN-m OK 302 sqmm 166 c/c 260 c/c 374 c/c -1a Regular 150 mm 12 KN 7.20 m 3.50 m 2.06 - 21 KN/m 18 KN-m OK 420 sqmm 120 c/c 187 c/c 269 c/c -2 Regular 150 mm 12 KN 9.20 m 1.50 m 6.13 - 9 KN/m 3 KN-m OK 180 sqmm 279 c/c 436 c/c 628 c/c -3 Regular 150 mm 12 KN 5.70 m 2.00 m 2.85 - 12 KN/m 6 KN-m OK 180 sqmm 279 c/c 436 c/c 628 c/c -4 Regular 150 mm 12 KN 3.60 m 2.00 m 1.80 + 11 KN/m 8 KN/m 5 KN-m 3 KN-m OK 180 sqmm 180 sqmm 279 c/c 279 c/c 436 c/c 436 c/c 628 c/c 628 c/c +5 Regular 150 mm 12 KN 15.00 m 2.60 m 5.77 - 16 KN/m 10 KN-m OK 224 sqmm 224 c/c 350 c/c 505 c/c -6 Regular 150 mm 12 KN 6.50 m 5.50 m 1.18 + 25 KN/m 22 KN/m 26 KN-m 20 KN-m OK 604 sqmm 468 sqmm 83 c/c 107 c/c 130 c/c 168 c/c 187 c/c 242 c/c +7 Regular 150 mm 12 KN 7.40 m 6.00 m 1.23 + 28 KN/m 24 KN/m 32 KN-m 24 KN-m OK 782 sqmm 567 sqmm 64 c/c 89 c/c 100 c/c 139 c/c 145 c/c 199 c/c +8 Regular 150 mm 12 KN 8.30 m 2.40 m 3.46 - 14 KN/m 9 KN-m OK 190 sqmm 265 c/c 414 c/c 596 c/c -9 Regular 150 mm 12 KN 6.70 m 3.70 m 1.81 + 20 KN/m 15 KN/m 17 KN-m 9 KN-m OK 379 sqmm 203 sqmm 133 c/c 248 c/c 207 c/c 388 c/c 298 c/c 558 c/c +
10 Sunken 150 mm 21 KN 6.50 m 5.00 m 1.30 + 42 KN/m 35 KN/m 41 KN-m 29 KN-m OK 1066 sqmm 706 sqmm 47 c/c 71 c/c 74 c/c 111 c/c 106 c/c 160 c/c +11 Sunken 150 mm 21 KN 5.80 m 4.80 m 1.21 + 39 KN/m 34 KN/m 35 KN-m 27 KN-m OK 869 sqmm 644 sqmm 58 c/c 78 c/c 90 c/c 122 c/c 130 c/c 176 c/c +
Concrete
Steel
Thickness Check
Spacing provided in mm c/cLonger
SpanShorter Span 8# 10# 12#
Wlonger Wshorter
Values of Moments and Shear force at different locations
Ma
rk Location (meters) Moments (KNm) Shear (KN)
x y0 0 0 0 9 0 0
1.5 0 0 0 9 0 153 0 0 0 7 0 27
4.5 0 0 0 4 0 366 0 0 0 0 0 39
7.5 0 0 0 -4 0 369 0 0 0 -7 0 27
10.5 0 0 0 -9 0 1512 0 0 0 -9 0 00 1.5 0 0 9 15 0
1.5 1.5 20 20 8 14 143 1.5 38 38 6 10 25
4.5 1.5 49 49 3 6 336 1.5 53 53 0 0 36
7.5 1.5 49 49 -3 -6 339 1.5 38 38 -6 -10 25
10.5 1.5 20 20 -8 -14 1412 1.5 0 0 -9 -15 00 3 0 0 7 27 0
1.5 3 38 38 6 25 103 3 69 69 5 19 19
4.5 3 91 91 3 10 256 3 98 98 0 0 27
7.5 3 91 91 -3 -10 259 3 69 69 -5 -19 19
10.5 3 38 38 -6 -25 1012 3 0 0 -7 -27 00 4.5 0 0 4 36 0
1.5 4.5 49 49 3 33 63 4.5 91 91 3 25 10
4.5 4.5 118 118 1 14 146 4.5 128 128 0 0 15
7.5 4.5 118 118 -1 -14 149 4.5 91 91 -3 -25 10
10.5 4.5 49 49 -3 -33 612 4.5 0 0 -4 -36 00 6 0 0 0 39 0
1.5 6 53 53 0 36 03 6 98 98 0 27 0
4.5 6 128 128 0 15 06 6 139 139 0 0 0
7.5 6 128 128 0 -15 09 6 98 98 0 -27 0
10.5 6 53 53 0 -36 012 6 0 0 0 -39 00 7.5 0 0 -4 36 0
1.5 7.5 49 49 -3 33 -63 7.5 91 91 -3 25 -10
4.5 7.5 118 118 -1 14 -146 7.5 128 128 0 0 -15
7.5 7.5 118 118 1 -14 -149 7.5 91 91 3 -25 -10
10.5 7.5 49 49 3 -33 -612 7.5 0 0 4 -36 00 9 0 0 -7 27 0
1.5 9 38 38 -6 25 -103 9 69 69 -5 19 -19
4.5 9 91 91 -3 10 -256 9 98 98 0 0 -27
7.5 9 91 91 3 -10 -259 9 69 69 5 -19 -19
10.5 9 38 38 6 -25 -1012 9 0 0 7 -27 00 10.5 0 0 -9 15 0
1.5 10.5 20 20 -8 14 -143 10.5 38 38 -6 10 -25
4.5 10.5 49 49 -3 6 -336 10.5 53 53 0 0 -36
7.5 10.5 49 49 3 -6 -339 10.5 38 38 6 -10 -25
10.5 10.5 20 20 8 -14 -1412 10.5 0 0 9 -15 00 12 0 0 -9 0 0
1.5 12 0 0 -9 0 -153 12 0 0 -7 0 -27
4.5 12 0 0 -4 0 -366 12 0 0 0 0 -39
7.5 12 0 0 4 0 -369 12 0 0 7 0 -27
10.5 12 0 0 9 0 -1512 12 0 0 9 0 0
Mx My Mxy Qx Qy
Staircase Design
DataEffective Span (l) 3.00 mmRiser (R) 150 mmThread (T) 300 mmWaist Slab thickness (t) 150 mmClear Cover 15 mmEffective Depth of Waist Slab (d) 135 mm
Grade of Concrete (fck) 20 MPaGrade of Steel (fy) 415 MPa
LoadingLoads on going Loads on waist slabSelf weight of waist slab 4.19 KN/m Self weight of landing slab 3.75 KN/mSelf weight of steps 1.88 KN/m Live Load 2.00 KN/mLive Load 3.00 KN/m Floor Finish Load 1.00 KN/mFloor Finish Load 1.00 KN/m Total Load 6.75 KN/m
Total Load 10.07 KN/m Factored Load 10.13 KN/mFactored Load 15.10 KN/m
Bending Moment
###Bending Moment = 17 KN-m
Reactionto be used as UDL = 23 KN ###
60 KN-m
Area of Main SteelAst 370 sqmm
Spacing
Diameter of barSpacing across x 306 c/c 544 c/c
Provded Main Steel:
Area of Distribution SteelAst 180 sqmm
Spacing
Diameter of barSpacing across y 279 c/c 436 c/c
Provided Distridution Steel:
12ø 16ø
8ø 10ø
Calculate Bending Moment using the equation (W*L*L )/8
Seismic Zone II Table 2 IS 1893 2002 pg 16Seismic Intensity z 0.1
Importance factor I 1.5 Table 6 IS 1893 2002 pg 18
Response Reduction Factor R 3 Table 7 IS 1893 2002 pg 23
Lateral Dimension of Building d 65.6 metersHeight of the of Building h 50.4 meters
with brick infill
Fundamental Natural Period 0.560
Type of Soil Medium Soil
Spectral Acceleration Coefficient 0.000
Design Horizontal Seismic Coefficient 0
Seismic Weight of Building W 680034 KN
Design Seismic Base Shear 0 KN
Ta
Sa/g
Ah
VB
Combined Footing
1 Footing Size Design
Load 1 Pu1 2000 KNLoad 2 Pu2 1850 KNCombine load Pcu 3850 KNDesign Load Pc 2823 KN
Moment in x dir Mux 40 KN-mMoment in y dir Muy 40 KN-m
c/c dist b/w col in x dir 2.725 metersc/c dist b/w col in y dir 0.000 meters
Col Dim x dir 0.20 metersy dir 0.20 meters
SBC q 150 KNm2
Footing Size required A req 18.82 sqmm
Footing Size ProvidedL 6.00 metersB 3.20 meters
Area Provided A prvd 19.20 meters
x bar 1.309y bar 0.000
Zx 10.24Zx 19.20
Nup 151 KNm2
Increase the Footing Size
2 Beam Design
Total Load W 151 KNm2Factored Load Wu 725 KNm2
1.691 meters 2.725 meters 1.584 meters
3.20 meters
6.00 meters
725 KNm2
1.69 meters 2.73 meters 1.58 meters
Beam Size width 600 mmdepth 900 mm
Moment Mb 898 KN-m
Design the beam from the BEAM DESIGN SHEET
Bottom ReinforcementType Bar dia Nos Area of Steel
Layer 1 25 mm 6 2945 sqmmLayer 2 25 mm 6 2945 sqmmLayer 3 -
Total Steel Provided 5890 sqmmPercentage of Steel 1.148 %
Top ReinforcementType Bar dia Nos Area of Steel
Layer 1 25 mm 6 2945 sqmmLayer 2 20 mm 6 1885 sqmmLayer 3 -
Total Steel Provided 4830 sqmm
3 Slab Design
Net upward pressure Nup 151 KNm2l 1.30 meters /=width of footing from col face
Bending Moment Ms 128 KN-mFactored Moment Mus 191 KN-m 1.5*Ms
Concrete fck 20 MPafy 415 MPa
Minimum Depth Required dmin 264 d=sqrt(Ms/Rumax*1000*b)
Depth Provided D 600 mmClear Cover c 50 mmEffective Cover d' 56 mmEffective Depth d' 544 mm
Area of Steel across x dir Spacing c/c in mm 20#
1014 sqmm 112 c/c 198 c/c 310 c/c
Ast across x direction 12 mm dia @ 100 mm c/c 1131 sqmmDist Ast across y direction 8 mm dia @ 175 mm c/c 287 sqmm
4 Shear Check for Slab
Vu1 171 KNζv 0.315 MPa
ζc 0.316 MPa
Shear Check OK
M=Nup*l2/2
Steel
12# 16#
56.00 meters
3.20 meters 600 mm
1.7 meters 2.73 meters 1.6 meters
600 mm
6 - 25 mm dia6 - 20 mm dia
90
0 m
m
6 - 25 mm dia6 - 25 mm dia
60
0 m
m
250 mm
8 mm dia @ 175 mm c/c 12 mm dia @ 100 mm c/c
6 - 25 mm dia6 - 20 mm dia
6 - 25 mm dia6 - 25 mm dia
Design Of Isolated Footing 16 of 41
1 Footing Size Design
Load Pu 1500 KNDesign Load P 1100 KN
Moment in x dir Mux 30 KN-mMoment in y dir Muy 30 KN-m
Column size cx 450 mmcy 450 mm
SBC q 150 KN/sqm
Footing Size required A req 7.33 sqmm
Footing Size ProvidedL 3.30 metersB 2.40 meters
Area Provided A prvd 7.92 meters
Zx 3.17Zx 4.36
Net upward pressure Nup 150 KNm2
Footing Size OK
2 Slab Design
lx 1.425ly 0.975
Bending Moment in x dir Mx 228 KN-mBending Moment in y dir My 107 KN-m
Concrete fck 20 MPafy 415 MPa
Minimum Depth Required dmin 288
Depth Provided D 650 mmClear Cover c 50 mmEffective Cover d' 58 mmEffective Depth d' 592 mm
Area of SteelSpacing c/c in mm
20#1111 sqmm 102 c/c 181 c/c 283 c/c710 sqmm 159 c/c 283 c/c 442 c/c
Minimum Ast required across y direcion
Ast across x direction 16 mm dia @ 125 mm c/c 1608 sqmm
Ast across y direction 16 mm dia @ 125 mm c/c 1608 sqmm
Steel
12# 16#
Design Of Isolated Footing 17 of 41
3 One Way Shear along x direction
Vu1 449 KNζv 0.316 MPa
ζc 0.317 MPa
Vc1 451 KN
One Way Shear Check OK
4 One Way Shear along y direction
Vu1 284 KNζv 0.145 MPa
ζc 0.260 MPaVc1 508 KN
One Way Shear Check OK
5 Two Way ShearVu2 1536 KNζv 0.622 MPa
ks*ζc 1.118 MPaVc1 2759 KN
Two Way Shear Check OK
Design Of Isolated Footing 18 of 41
L= 3.30 meters
450
B= 2.40 meters 450
65
0 m
m250 mm
16 mm dia @ 125 mm c/c 16 mm dia @ 125 mm c/c
Dome Design
Dimensions of DomeDiameter d = 12600 mmHeight h = 3000 mmThickness t = 150 mm
Radius of Sphere r = 8115 mm
h =
3.0
0 m
Φ = 50.93Ѳ = 0 to 50.93
Loading d = 12.60 mDead Load DL = 3.75 KN/m
Live Load LL = 0.10 KN/m 50.93 r = 8.12 mWind Load WL = 0.10 KN/mTotal Load W = 3.95 KN/mFactored Load Wu = 5.93 KN/m
Meridional Stress Hoop StressѲ Mt Ѳ Mt
50.93 0.197 MPa 50.93 0.003 MPa45.00 0.188 MPa 45.00 0.025 MPa40.00 0.182 MPa 40.00 0.041 MPa35.00 0.176 MPa 35.00 0.055 MPa30.00 0.172 MPa 30.00 0.067 MPa25.00 0.168 MPa 25.00 0.077 MPa20.00 0.165 MPa 20.00 0.086 MPa15.00 0.163 MPa 15.00 0.093 MPa5.00 0.161 MPa 5.00 0.100 MPa0.00 0.160 MPa 0.00 0.101 MPa
Maximum Meridional Stress 0.197 MPa Maximum Hoop Stress 0.101 MPa
fck 20 MPaFy 415 MPa
230.00
Area of steel 128 sqmm Area of steel 66 sqmm
Bar Dia 10 mm Bar Dia 10 mmSpacing 613 c/c Spacing 1187 c/c
Meridional Thrust @ Base 29 KN/mHorizontal Component on Ring Beam 19 KN/mHoop Tension on Ring Beam 117 KN
Area of steel 509 sqmm
Bar Dia 16 mmNo of Bars 3 nos
бst
r = 8115.00 m
3 Hinged Arch Design
19.7 KNm2
Dimensions of DomeDiameter d = 12600 mmHeight h = 5000 mm
Radius of Sphere r = 6469 mmΦ = 76.87Ѳ = 0 to 76.87
LoadingDead Load DL = 3.00 KN/m
Live Load LL = 0.10 KN/mOther Load OL = 10.00 KN/mTotal Load W = 13 KN/mFactored Load Wu = 20 KN/m
Vertical Reaction VA = VB = 123.8 KNHorizontal Reaction HA = HB = 234.0 KN
Ѳ x y Moment76.87 0.00 0.00 075.00 0.05 0.21 -4260.00 0.70 1.77 -33150.00 1.34 2.69 -48140.00 2.14 3.49 -59630.00 3.07 4.13 -68020.00 4.09 4.61 -73710.00 5.18 4.90 -7695.00 5.74 4.98 -7770.00 6.30 5.00 -780
Max Values 780 KN-m
3 Hinged Arch Designh
= 5
.00
m
d = 12.60 m
76.87 r = 6.47 m
Radial Shear Normal Thrust 0 67 17467 174 42 59 18059 180 331 10 224-10 224 481 56 245-56 245 596 100 259
-100 259 680 141 265-141 265 737 178 262-178 262 769 209 252-209 252 777 222 244-222 244 780 234 234-234 234
234 KN 265 KN
r = 6469.00 m
Circular Beam
Dimensions of Ring BeamRadius r = 6.30 mtsNo of supports n = 8 nos
Constants Ѳ = 23 deg 0.3927 radians
9 1/2 0.1658 radians
C1 = 0.066C2 = 0.03C3 = 0.005
LoadingWu = 10 KN/m
Shear Force
deg KN KN-m KN-m0 24.74 -20.62 0.009 1/2 14.29 -0.05 1.57
22 1/2 0.00 10.39 0.00
Beam Datawidth 300 mmdepth 600 mm
Equivalent Shear
Ve = V+1.6(T/b) = 33 KN
Equivalent MomentMt = T((1+D/b)/1.7) = 1 KN-m Mt = BM due to torsion
22 KN-m
20 KN-m
Φm =
ΦFΦ MΦ Mm
t
Bending Moment
Torsional Moment
T=MΦ
Me1 = M+Mt = Me1 = Equivalent BM on tension side
Me2 = M-Mt = Me2 = Equivalent BM on compression side
A Load 2700Moment x-dir y-dirBottom 0 29Top 6 137
Col Type Rectangular Column (reinf. on 2 sides)
x-dir y-dirUnsupported Length 8250 8250Col Size 200 900
d'/D 0.05 0.20d' 40
Concrete 20Steel 415
D
Effective Length Ratio0.80 from IS Code0.90 manual Calculation
Effective Length to be considered from Manual CalculationEffective Length (le) lex Ley
7425 7425E Slenderness Ratio
le/D 8 Short Columnle/b 37 Slender ColumnMoment due to Slen Muax 0
Muay 372
Min Ecc ex 46.5ey 23.2
Moment due to ecc Mux 125.55Muy 62.55
G Reduction of MomentsPercentage assumed 2.18
Asc 3924
Puz 2841
k1 K2 Pbx-x 0.219 0.096 367y-y 0.184 -0.022 291
Kx 0.06Ky 0.06
Additional Moments due to ecc Max 0May 21
Modified Initial Moments Mux 3.6Muy 70.6
Summary of MomentsA Moment due to eccentricity + Modified additional moments
Mux 126Muy 83
B Modified initial moments + Modified additional momentsMux 4Muy 91
C 0.4Muz + Modified additional momentsMux 0Muy 32
Final Design LoadsPu 2700Mux 126Muy 91
Bi-Axial Column
Design LoadsPu = 2400 KN
Mux = 192 KN-mMuy = 517 KN-m
Col Datab = 600 mmD = 750 mmd' = 40.0 mm
d'/D = 0.10d'/b = 0.10
Material Gradesfck = 20 MPafy = 415 MPa
Design ConstantsSteel % pt = 1.2 Ast = 5400 sqmm
pt/fck = 0.06 Min Ast = 3600 sqmmPu/fck*b*D = 0.27
0.11
0.11
Puz = 5682
743
594
Pu/Puz = 0.42
0.26
0.87
1.37
0.98
Steel Percentage OK
Steel Detailsnos dia ast
Type 1 4 20 mm 1257 sqmmType 2 8 16 mm 1608 sqmm
Total Steel 12 - 2865 sqmmPercentage 0.64%
Mux/fck*b*D2 =
Muy/fck*b*D2 =
Mux1 =
Muy1 =
Mux/Mux1 =
Muy/Muy1 =
αn =
(Mux/Mux1)αn + (Muy/Muy1)αn
Deflection Calculation
Load W 8 KN/m 70 KN/mLength l 2.60 m 3.00 m
Ec 22000000 MPa 22000000 MPa
Width b 0.20 m 0.20 mDepth d 0.45 m 0.60 mMoment M 8.66 m 82.13 mReaction R 13.33 m 109.50 m
Ixx 0.0015 mm4 0.0036 mm4
Deflectiondy
0.1 mm 0.5 mmFormula
Simply supported beam with UDL
Simply supported beam with Point Load
Elasticity of Concrete = 5000(√fck)
Moment of Inertia = bd3/12
5Wl4/384EI Wl3/48EI
Deflection Calculation
1400 KN/m 10 KN/m3.80 m 5.00 m
22000000 MPa 22000000 MPa
1.50 m 0.20 m1.10 m 0.60 m2601.46 m 40.63 m2738.38 m 32.50 m
0.1664 mm4 0.0036 mm4
10.0 mm 5.3 mm
Cantilever beam with UDL
Cantilever beam with Point Load
Wl4/8EI Wl3/3EI
DESIGN OF RETAINING WALL
1 Preliminary Datai) Height of RW h 3.00 meters
ii) Soil Density 18 KN/cum
iii) SBC 250 KN/sqm
iv) Angle of repose Ø30 degrees
0.524 radians
v) Surcharge Angle Ө0 degrees
0.000 radiansvi) Coefficient of friction µ 0.5
vii) Surcharge Load 4 KN/sqm
2 Pressure Coefficients
i)Active Pressure Coefficients
Ca 0.333
ii)Passive Pressure Coefficients
Cp 3.00 = (1+SinØ) / (1+SinØ)
3 Preliminary DimensionsProposed Adopted
i) Thickness of Stem - 0.20 meters
ii) Thickness of footing base slab 0.24 meters 0.30 meters
iii)Length of base slab L = 1.5 * √(Ca/3) * (h + hs) 1.61 meters
2.00 metersor L = 0.6h to 0.65h 2.09 meters
iv) Extra Height of Retaining Wall due to Surcharge 0.22 meters
v) Total Height of Retaining Wall due to Surcharge 3.22 meters
vi) Extra Height of RW due to inclined back fill 0.00 meters
vii) Total Height of RW due to inclined back fill 3.00 meters
viii) 3.22 meters
4 Stability against Overturning
i) Active pressure due Surcharge Load 4 KN
ii) Active pressure due Backfill Load 27 KN
iii) Total Load on stem 31 KN
iv) Overturning Moment 33 KNm
v) Load Lever arm from end of stem Moment
Backfill Load = (L-ts)*(h-tb)*γs 87 KN 0.90 meters 79 KNm
Surcharge Load = Ca*Ws*h 4 KN 0.90 meters 4 KNm
Inclined Backfill Load = ((L-ts)*hi)/2*γs 0 KN 0.60 meters 0 KNm
= ts*(h-tb)*γconc 14 KN 0.95 meters 13 KNm
Base self weight = L*tb*γconc 15 KN 1.00 meters 15 KNm
Downward component = Pa*sinӨ 0 KN 0 KNm
Other Load 0 KNm∑W 120 KN 110 KNm
vi) Distance of Resultant Vertical Force from end of heel 0.92 meters
vii) Stabilizing Moment 130 KNm
viii) Factor of Safety against OVERTURNING
3.54 > 1.4 Safe against Overturning
5 Stability against Slidingi) Sliding Force Pa*CosӨ 31 KNii) Resisting Force 60 KN
iii) Factor of Safety against SLIDING
1.74 > 1.4 Safe against Sliding
Shear Key not required
iv) Shear key Design
a) Shear Key Sizex 0.00 metersy 0.00 meters
b) Distance from stem z 0.00 meters
c) Heigth of exacavation 0.00 meters
d) Heigth of exacavation 0.00 meters
e) Passive Pressure 0 KN
v) Revised Factor of Safety against SLIDING
1.74 > 1.4Safe against Sliding
6 Soil Pressures at footing basei) Resultant Vertical Reaction ∑W = R 120 KNii) Distance of R from heel Lr = (Mw+Mo)/R 1.19 metersiii) Eccentricity e = Lr- L/2 0.19 meters
Eccentricity lies within middle third of the base hence OK
iv) Pressure Distridution on soil 95 KN/sqm
25 KN/sqmMax Pressure qmax<SBC hence pressure on base is OK
v) 88 KN/sqm
γs
qo
Ws
=(cosӨ-√(cos2Ө-cos2Ø)*cosӨ) / (cosӨ+√(cos2Ө-cos2Ø))
ts
tb = 0.08 * (h + hs)
hs = Ws/γs
Hs = h+hs
hi = (L-ts)* tanӨ
Hi = h+hi
Design Height of RW considered H = Max of H1 & H2
Pa1 = Ca*Ws*h
Pa2 = Ca*γs*h2 / 2
Pa = Pa1 + Pa2
Mo= (Pa1 * h/2) +(( Pa2*CosӨ)* h/3)
W1 (L-ts) / 2
W2 (L-ts) / 2
W3 (L-ts) / 3
W4 Stem self weight (L- (ts/2))/2
W5 L / 2
W6
W6
∑Mw
xw=∑Mw/∑W
Mr =∑W * (L - xw)
(FS)OT = 0.9 * (Mr/Mo)
F = µ*∑W
(FS)SL=0.9*(F/(Pa*CosӨ))
h1
h2 = h1 + y + (z * tanØ)
Pp = Cp*γs*(h12-h2
2) / 2
(FS)sliding = 0.9 * ((F+Pp)/(Pa*CosӨ))
qmax = R/L * (1+(6*e/L))
qmin = R/L * (1-(6*e/L))
Pressure at junction of stem and heel
qsh=qmax-((qmax-qmin)/L)*ts)
DESIGN OF L Shaped Cantilever RETAINING WALL
1 Preliminary Datai) Height of Retaining Wall h 3.60 meters
ii) Soil Density 18 KN/cum
iii) SBC 150 KN/sqm
iv) Angle of repose Ø 30 degrees
0.524 radians
v) Surcharge Angle Ө 0 degrees
0.000 radiansvi) Coefficient of friction µ 0.5
vii) Surcharge Load 2 KN/sqm
2 Pressure Coefficientsi) Active Pressure Coefficients Ca 0.333
ii) Passive Pressure Coefficients Cp 3.00 = (1+SinØ) / (1+SinØ)
3 Preliminary DimensionsProposed Adopted
i) Thickness of Stem min 200mm 0.20 meters
ii) Thickness of footing base slab 0.29 meters 0.25 metersiii) Length of base slab L = 1.5 * √(Ca/3) * (h + hs) 1.86 meters
2.50 metersL = 0.6h to 0.65h 2.41 meters
iv) Extra Height of Retaining Wall due to Surcharge 0.11 meters
v) Total Height of Retaining Wall due to Surcharge 3.71 meters
vi) Extra Height of RW due to inclined back fill 0.00 meters
vii) Total Height of RW due to inclined back fill 3.60 meters
viii) 3.71 meters
4 Stability against Overturning
i) Active pressure due Surcharge Load 2 KN
ii) Active pressure due Backfill Load 41 KN
iii) Total Load on stem (Force) 44 KN
iv) Overturning Moment due to Imposed load 5 KN
v) Overturning Moment due to Backfill load 51 KN
vi) Overturning Moment 68 KN
v) Load Lever arm at end of stem Moment
Backfill Load = (L-ts)*(h-tb)*γs 143 KN 1.35 meters 193 KNm
Inclined Backfill Load = ((L-ts)*hi)/2*γs 0 KN 0.97 meters 0 KNm
= ts*(h-tb)*γconc 17 KN 0.10 meters 2 KNm
Base self weight = L*tb*γconc 16 KN 1.25 meters 20 KNm∑W 176 KN 215 KNm
viii) Safe against Overturning -clause 20.1 page 33 of IS 456 2000
5 Stability against Sliding
i) Sliding Force 44 KNii) Resisting Force 88 KN
iii) 1.81 > 1.4 Safe against Sliding -clause 20.2 page 33 of IS 456 2000
6 Soil Pressures at footing basei) Net Moment at toe Mn = Mw - Mo 159 KNii) Point of application of Resultant R x = Mn/W 0.90 metersiii) Eccentricity e = (L/2) - x 0.35 meters L/6= 0.42
e<L6 Eccentricity lies within middle third of the base hence OK
iv) Pressure Distridution on soil 129 KN/sqm
12 KN/sqmMax Pressure qmax<SBC hence pressure on base is OK
v) 120 KN/sqm
γs
qo
Ws
=(cosӨ-√(cos2Ө-cos2Ø)*cosӨ) / (cosӨ+√(cos2Ө-cos2Ø))
ts
tb = 0.08 * (h + hs)
hs = Ws/γs
Hs = h+hs
hi = (L-ts)* tanӨ
Hi = h+hi
Design Height of RW considered H = Max of H1 & H2
PHS = Ca*Ws*h
PH = Ca*γs*h2 / 2
Pa = PHS + PH
MOIL = PHS*h/2
MODL = PH*h/3
Mo = (1.2*MDIL) + (1.4*MOIL)
W1 ((L-ts) / 2) + ts
W2 ((L-ts) / 3) + ts
W3 Stem self weight ts / 2
W4 L / 2
∑Mw
Mw not less than (1.2*MODL) +(1.4*MOIL)
Pa = PHS + PH
F = µ*∑W
(FS)SL= (0.9*F)/(Pa)
qmax = W/L * (1+(6*e/L))
qmin = W/L * (1-(6*e/L))
Pressure at junction of stem and heel
qsh=qmax-((qmax-qmin)/L)*ts)
7 Constants for Working Stress Method
Design Constantsi) Grade of concrete 20 MPaii) Grade of steel 415 MPa
iii) Compr stress in concrete c 7.0 table 21 page 81 IS 456iv) Tensile stress in steel t 230v) Modular ratio m = 280/3c 13.33vi) Neutral axis depth factor k=mc/(mc+t) 0.289vii) Lever arm j = 1 - k/3 0.904viii) Factor R= cjk / 2 0.913
8 Design
A) Stem
i) Beanding Moment at base of stem 56 KN/m
ii) Thickness required 0.01 metersiii) Thickness provided ts 0.20 meters
Thickness of Stem is OK
iv) Ast required 1914 sqmm
v) Ast provided 16 mm dia @ 105 mm c/c 1915 sqmm
vi) Percentage of Steel 1.37 %
Steel OK
B) Base SlabForce Lever arm from end of stem Moment
i) Force due to backfill+surcharge 143 1.15 meters 165 KNm
ii) Force due to inclined backfill 0 0.77 meters 0 KNm
iii) Self Weight of base slab 16 1.25 meters 20 KNm∑Ws 159 Md 184 KNm
vi) Upward soil pressure 151 0.83 meters 126 KNmDownward Pressure is greater Mu 126 KNm
v) Bending Moment Msh = Mu-Md 58
vi) Thickness required 0.25 metersThickness of Stem is OK
vii) Thickness provided ts 0.25 meters
viii) Ast required 1440 sqmm
ix) Ast provided 16 mm dia @ 125 mm c/c 1608 sqmm
x) Percentage of Steel 0.74 %
Steel OK
C) Reinforcement Details
M = MODL + MOIL
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
= (H2-tb)*(L-ts)*γs (L-ts) / 2
= hi/2*(L-ts)*γs (L-ts) / 3
=L *tb*γconc L / 2
Nup = ((qsh+qmin)/2)*(L-ts) ((qsh+(2*qmin))/(qsh+qmin)) * ((L-ts)/3)
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
FILL
DESIGN OF Reverse L Shaped Cantilever RETAINING WALL
1 Preliminary Datai) Height of Retaining Wall h 3.00 metersii) Height of Plinth Fill hp 0.50 meters
iii) Soil Density 18 KN/cum
iv) SBC 250 KN/sqm
v)Angle of repose Ø 30 degrees
0.524 radians
vi)Surcharge Angle Ө 0 degrees
0.000 radiansvii) Coefficient of friction µ 0.5
vii) Surcharge Load 4 KN/sqm
2 Pressure Coefficientsi) Active Pressure Coefficients Ca 0.333
ii) Passive Pressure Coefficients Cp 3.000 = (1+SinØ) / (1+SinØ)
3 Preliminary DimensionsProposed Adopted
i) Thickness of Stem min 200mm 0.20 meters
ii) Thickness of footing base slab 0.24 meters 0.45 meters
iii) Length of base slabif sloped backfill
-0.60 meters
2.45 meters0.00 meters
if horizontal backfill-0.96 meters0.00 meters
L = 0.6h to 0.65h 2.09 meters
iv) Extra Height of Retaining Wall due to Surcharge 0.22 meters
v) Total Height of Retaining Wall due to Surcharge 3.22 meters
vi) Extra Height of RW due to inclined back fill 0.00 meters
vii) Total Height of RW due to inclined back fill 3.00 meters
viii) 3.22 meters
4 Stability against Overturning
i) Active pressure due Surcharge Load 4 KN
ii) Active pressure due Backfill Load 31 KN
iii) Total Load on stem (Force) 35 KN
iv) Overturning Moment due to Imposed load 7 KN
v) Overturning Moment due to Backfill load 33 KN
vi) Overturning Moment 50 KN
v) Load Lever arm at start of heel Moment
Front fill Load = (L-ts)*(hp-tb)*γs 2 KN 1.13 meters 2 KNm
= ts*(h-tb)*γconc 14 KN 2.35 meters 33 KNm
Base self weight = L*tb*γconc 28 KN 1.23 meters 34 KNm
Other Load PT Beam Load 0 KN∑W 43 KN 69 KNm
viii) Safe against Overturning -clause 20.1 page 33 of IS 456 2000
5 Stability against Sliding
i) Sliding Force 35 KNii) Resisting Force 22 KN
iii) 0.55 < 1.4 Unsafe against Sliding -clause 20.2 page 33 of IS 456 2000
5a Shear key Design
a) Shear Key Sizex 0.30 metersy 0.30 meters
b) Distance from stem z 0.30 meters
c) Heigth of exacavation 0.60 meters
d) Heigth of earth mobilization 1.07 meters
e) Passive Pressure 21 KN
v) Revised Factor of Safety against SLIDING
γs
qo
Ws
=(cosӨ-√(cos2Ө-cos2Ø)*cosӨ) / (cosӨ+√(cos2Ө-cos2Ø))
ts
tb = 0.08 * (h + hs)
α = 1 - (q0/2.7*γs*H)L = H*sqrt((Ca*cosβ)/((1-α)*(1+3α))
α = 1 - (q0/2.2*γs*H)L = 0.95*H*sqrt((Ca)/((1-α)*(1+3α))
hs = Ws/γs
Hs = h+hs
hi = (L-ts)* tanӨ
Hi = h+hi
Design Height of RW considered H = Max of H1 & H2
PHS = Ca*Ws*h
PH = Ca*γs*h2 / 2
Pa = PHS + PH
MOIL = PHS*h/2
MODL = PH*h/3
Mo = (1.2*MDIL) + (1.4*MOIL)
W1 ((L-ts) / 2)
W3 Stem self weight (ts/2) + (L-ts)
W4 L / 2
W5
∑Mw
Mw not less than (1.2*MODL) +(1.4*MOIL)
Pa = PHS + PH
F = µ*∑W
(FS)SL= (0.9*F)/(Pa)
h1
h2 = h1 + y + (z * tanØ)
Pp = Cp*γs*(h12-h2
2) / 2
v)1.09 > 1.4
Unsafe against Sliding. Shear Key Required
6 Soil Pressures at footing base
i) Net Moment at toe 28 KNii) Point of application of Resultant R x = Mn/W 0.65 metersiii) Eccentricity e = (L/2) - x 0.58 meters L/6= 0.41
e>L6 Eccentricity lies outside the middle third of the base. Revise the base dimensions
iv) Pressure Distridution on soil 43 KN/sqm
-7 KN/sqmMax Pressure qmax<SBC hence pressure on base is OK
v) 39 KN/sqm
(FS)sliding = 0.9 * ((F+Pp)/(Pa*CosӨ))
Mn = Mw - (MOIL+MODL)
qmax = W/L * (1+(6*e/L))
qmin = W/L * (1-(6*e/L))
Pressure at junction of stem and heel
qsh=qmax-((qmax-qmin)/L)*ts)
7 Constants for Working Stress Method
Design Constantsi) Grade of concrete 20 MPaii) Grade of steel 415 MPa
iii) Compr stress in concrete c 7.0 table 21 page 81 IS 456iv) Tensile stress in steel t 230v) Modular ratio m = 280/3c 13.33vi) Neutral axis depth factor k=mc/(mc+t) 0.289vii) Lever arm j = 1 - k/3 0.904viii) Factor R= cjk / 2 0.913
8 Design
A) Stem
i) Beanding Moment at base of stem 40 KN/m
ii) Thickness required 0.01 metersiii) Thickness provided ts 0.20 meters
Thickness of Stem is OK
iv) Ast required 1387 sqmm
v) Ast provided 16 mm dia @ 120 mm c/c 1676 sqmm
vi) Percentage of Steel 0.99 %
Steel OK
B) Base SlabForce Lever arm from end of stem Moment
i) Force due to Frontfill 2 1.13 meters 2 KNm
iii) Self Weight of base slab 28 1.23 meters 34 KNm∑Ws 30 Md 36 KNm
vi) Upward soil pressure 35 0.58 meters 20 KNm
Upward Pressure is greater Mu 20 KNm
v) Bending Moment Msh = Mu-Md 16
vi) Thickness required 0.13 meters Thickness of Stem is OK
vii) Thickness provided ts 0.45 meters
viii) Ast required 193 sqmm
ix) Ast provided 12 mm dia @ 150 mm c/c 754 sqmm
x) Percentage of Steel 0.05 %
Steel OK
C) Reinforcement Details
M = MODL + MOIL
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
= (L-ts)*(hp-tb)*γs (L-ts) / 2
= L* tb * γconc L / 2
Nup = ((qsh+qmin)/2)*(L-ts) ((qsh+(2*qmin))/(qsh+qmin)) * ((L-ts)/3)
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
FILL
DESIGN OF Reverse L Shaped Cantilever RETAINING WALL
Design Constants for Working Stress Method
i) Grade of concrete 20 MPaii) Grade of steel 250 MPa
iii) Compr stress in concrete c 7.0iv) Tensile stress in steel t 140v) Modular ratio m = 280/3c 13.33vi) Neutral axis depth factor k=mc/(mc+t) 0.400vii) Lever arm j = 1 - k/3 0.867viii) Factor R= cjk / 2 1.213
Design
i) Height of Tank h 3.00 meters
ii) Saturated Soil Density 18 KN/cum
iii) Water Density 9.81 KN/cum
iv) Dry Soil Density 8.19 KN/cum
v) SBC 250 KN/sqm
vi)Angle of repose Ø 30 degrees
0.524 radians
vii)Active Pressure Coefficients
Ka 0.33 = (1-SinØ) / (1+SinØ)
A) Design of Long Walls
a) Tank empty with pressure of saturated soil from sidei) Active pressure pa = (Ka*γ'*H) + (γw*H) 38 KNii) Beanding Moment at base of wall M = (pa) *H/3 38 KN/m
iii) Thickness required 0.176 metersiv) Thickness provided ts 0.230 meters
Thickness of Stem is OK
v) Ast required
vi) Ast provided 16 mm dia @ 100 mm c/c
vii) Percentage of Steel
Steel OK
viii)50 % bars to be Curtailed from base 0.62 meters
plus 12 dia or thickness12dia 0.19 meters
thinkness 0.23 metersTotal curtaliment length from base 0.85 meters
ix) Ast required
Ast provided is more than mimimun Ast required hence OK
γs
γw
γ' = γ - γw
qo
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
h1 = h - h*(1/2)1/3
Ast min = 12 % of area
b) Tank full with water and no earth fill outsidei) Active pressure pa = (γw*H) 29 KNii) Beanding Moment at base of wall M = (pa) *H/3 29 KN/m
iii) Thickness required 0.156 metersiv) Thickness provided ts 0.230 meters
Thickness of Stem is OK
v) Ast required
vi) Ast provided 12 mm dia @ 100 mm c/c
vii) Percentage of Steel
Steel OK
viii)50 % bars to be Curtailed from base 0.62 meters
plus 12 dia or thickness12dia 0.14 meters
thinkness 0.23 metersTotal curtaliment length from base 0.85 meters
ix) Ast required
Ast provided is more than mimimun Ast required hence OK
dreq=√(Ms/(R*b)
Ast = M/(t*j*tse)
pt = Ast/(b*d)
h1 = h - h*(1/2)1/3
Ast min = 12 % of area
table 21 page 81 IS 456
pa = w*l/2
1369 sqmm
2011 sqmm
0.70 %
Steel OK
IS 456 caluse 26.2.3.1 page 44
276 sqmm
Ast provided is more than mimimun Ast required hence OK
pa = w*l/2
1071 sqmm
1131 sqmm
0.55 %
Steel OK
IS 456 caluse 26.2.3.1 page 44
276 sqmm
Ast provided is more than mimimun Ast required hence OK