PROJECT: Date Page

LOCATION 2014 9

Revision Job NoDESIGN TO BS 8110-1997, BS 8002-1994 and BS 8004-1986

(A) DESIGN PARAMETERRefer to the sketch drawings attachedAssumed angle of internal friction = 30 o

Assumed safe bearing capacity = 150 KN/m2

Density of retained soil = 20 KN/m3

Surcharge load = 10 KN/m2

(B) ACTIVE PRESSURE CALCULATIONActive pressure coefficient, Ka = = 0.33

Surcharge pressure, Ps = 0.33 x 10 = 3.3 KN/m2

Active earth pressure - bulk soil, Pb = 0.33 x 20 x 0.6 = 3.96 KN/m2

Active earth pressure - submerged soil, Psm = 0.33 x [ 20-10 ] x 2.177 = 7.1841 KN/m2

Active water pressure, Pw = 10 x 2.177 = 21.77 KN/m2

Using the maximum walll height of 1.877m

Height of active earth pressure = 1.877 + 0.3 = 2.177 mHeight of pore water pressure = 1.877 + 0.3 - 0.6 = 1.577 mHeight of retained water = 1.877 - 0.15 = 1.727 m

(C) HORIZONTAL LOAD CALCULATION factors

surcharge load 1.4Active pressure - bulk soil 1.4

Active pressure - bulk soil 1.4

Active pressure - submerged soil 1.4water pressure 1.4

TOTAL

(D) REINFORCEMENT DESIGN FOR WALL

= 46.61 KNmthe effective depth (mm), d = 154 mm

K = M = 0.079 < 0.156

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HENCE NO COMPRESSION REINFORCEMENT REQUIRED

lever arm Z(mm) = 139 mm

Area of reinforcement requiAs = = 768 mm2

Bar diameter, Ø = 12 mm

H12 @ 125 C/C (AS PROVIDED = = 905 mm2)

Distribution bars = 0.25%bh = 500 mm2

provide H12 @ 200 C/C AS PROVIDED = 565 mm2)

46.61

Moment M

10.9533.18

1.091.78

0.79

0.530.5323.70

10.061.66

moment about toe (KNm)

10.952.96

9.52

5.7517.44

Lever arm (m)Unfactored Force

(KN)7.181.19

8.62

7.82

factored Force(KN)

12.07

PROPOSED RECREATIONAL FACILITY DESIGNED BY

PROPOSED SWIMMING POOL P. Amankwah

CHECKED BYRichard Ofori Addo

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