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5) Return Wall

This document provides design details and stress calculations for a return wall. It includes dimensions for the wall and foundation, soil properties, and calculations of load, moment, stress on concrete and soil. The maximum stress on concrete is found to be 22.30 T/m2 (tons per square meter) in compression. The maximum stress on the soil is 17.71 T/m2 in compression, within allowable limits.

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kitti kothapalli
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83 views2 pages

5) Return Wall

This document provides design details and stress calculations for a return wall. It includes dimensions for the wall and foundation, soil properties, and calculations of load, moment, stress on concrete and soil. The maximum stress on concrete is found to be 22.30 T/m2 (tons per square meter) in compression. The maximum stress on the soil is 17.71 T/m2 in compression, within allowable limits.

Uploaded by

kitti kothapalli
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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DESIGN OF RETURN WALL

+ 523.600

Top width 0.55 m WL 0.600


Rear side batter 3.45 m + 523.000
Offset on earth side 0.50 m W4
Offset on front side 0.50 m + 522.625
Depth of foundation 0.75 m W1

W5
CC M15
Return wall top level + 523.600 W6
Top of prop. road level 523.000 5.600
Top of foundation level 518.000 W2
Bottom of foundation level 517.250

Density of soil= 2.10 t/m3 500 3450 550 500


Density of concrete= 2.40 t/m3 + 518.000 A
Density of RCC= 2.50 t/m3
+ 517.250 W7 B 0.750
4000
5000

STRESS ON CONCRETE: ( Taking moments about 'A' )

S.NO Description Load LA Moment


in Tons in mts in T.m

1 W1 : 0.550 x 5.600 x 2.400 7.392 0.275 2.03


2 W2 : 0.5 x 3.450 x 4.625 x 2.400 19.148 1.700 32.55
3 W4 : 3.450 x 0.375 x 2.500 3.234 2.275 7.36
4 W5 : 0.5 x 3.450 x 4.625 x 2.100 16.754 2.850 47.75
5 WL : 3.450 x 1.200 x 2.100 8.694 2.275 19.78
6 Pv : 0.0395 x( 6.200 )2-( 1.200 )2x 2.100 3.069 4.000 12.28
V= 58.291 121.8
7 Ph : 0.1580 x( 6.200 )2-( 1.200 )2x 2.100 12.277 2.100 (-) 25.78
M= 96.0

Lever arm = M/V = 96.0 / 58.29 = 1.646 m


Eccentricity = 1.646 - 4.000 /2 = 0.354 m
B/6 = 4.00 /6 = 0.667 m > 0.354 m Hence no Tension
Max. Stress = ( 58.29 / 4.000 ) x { 1 + (6 x 0.354 ) / 4.000 }
= 22.30 T/m² ( Compression )
Min. Stress = ( 58.29 / 4.000
) x { 1 - (6 x 0.354 ) / 4.000 }
= 6.84 T/m² Compression
(Allowed as per cl.303.3 of IRC:21-2000)
STRESS ON SOIL: ( Taking moments about 'B' )

S.NO Description Load LA Moment


in Tons in mts in T.m
Item 1 to 7 same as on concrete
1 VR 0.00 0.500 0.00
2 W1 : 7.392 0.78 5.73
3 W2 : 19.148 2.200 42.13
4 W3 : 0.00 0.000 0.00
5 W4 : 3.234 2.775 8.97
6 W5 : 16.754 3.350 56.13
8 W6 0.500 x 4.625 x 2.100 4.856 4.750 23.07
9 W7 5.000 x 0.750 x 2.400 9.000 2.500 22.50
10 Pv : 0.0395 x( 6.950 )2-( 1.200 )2x 2.100 3.887 5.000 19.44
V= 64.27 177.97
11 Ph : 0.158 x( 6.950 )2-( 1.200 )2x 2.100 15.549 2.415 ( - ) 37.55
M= 140.42
Lever arm = M/V = 140.42 / 64.27 = 2.185 m
Eccentricity = 2.185 - 5.000 /2 = 0.315 m
B/6 = 5.000 /6 = 0.833 m > 0.315 m Hence no Tension
Max. Stress = ( 64.27 / 5.000 ) x { 1 + (6 x 0.315 ) / 5.000 }
= 17.71 T/m² ( Compression )
Min. Stress = ( 64.27 / 5.000
) x { 1 - (6 x 0.315 ) / 5.000 }
= 8.00 T/m² Compression

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