Calculation

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Document DatedName 15/11/12

1.00 General Data

Unit weight of Concrete = 25

Unit weight of Reinforcement = 78.5

Bearing Capacity of Soil @ 1m below ground = 150

= 45 m/s

= (Equation 8, BS 6399-2:1997)

= 1 (Cl 2.2.2.2, BS 6399-2:1997)

= 1 (Cl 2.2.2.3, BS 6399-2:1997)

= 1 (Cl 2.2.2.4, BS 6399-2:1997)

= 1 (Cl 2.2.2.5, BS 6399-2:1997)

1.1 For Pylon - 1

1.1.1 Calculation of Loads

= 45 m/s

=

= 1.58 (Table 4, BS 6399-2:1997)

= 71.1 m/s

= (Equation 1, BS 6399-2:1997)

= 3.10

Height of Signboard, H = 10 mWidth of Signboard, W = 3.2 m

Effective area against wind = 32 m2Wind load on the frame = 99.16 kN

5.50 m

3.5

0 m

0.30 m

1.5

0 m

DESIGN OF FOUNDATION FOR SIGNBOARDSPylon 01 & 02

kN/m3

kN/m3

kN/m2

Vb (Basic wind speed)

Vs (site wind speed) Vb x Sa x Sd x Ss x Sp

Sa (Altitude factor)

Sd (Direction Factor)

Ss (Seasonal Factor)

Sp (Probability Factor)

Vs

Ve Vs x Sb

Sb

Ve

qe 0.613 x Ve2

qe kN/m2

SIG

NB

OA

RD

SIGNBOARD

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Length of Foundation, L = 3.5 mWidth of Foundation, B = 5.5 mDepth of Foundation, D = 1.5 m

= 19.25 m2Volume of Concrete in Foundation = 28.875 m3

= 17.65 m3

= 721.875 kN

= 20 kN

Total Downward load, P = 741.875 kN

= 644.56 kN-m

1.1.2 Check for Bearing PressureMax. Pressure at bottom of Foundation = 75.07 kN/m2Min. Pressure at bottom of Foundation = 2.01 kN/m2

1.2 For Pylon - 21.2.1 Calculation of Loads

= 45 m/s

=

= 1.73 (Table 4, BS 6399-2:1997)

= 77.85 m/s

= (Equation 1, BS 6399-2:1997)

= 3.72 kN/m2


Effective area against wind = 18.4 m2Wind load on the frame = 68.36 kN

3.50 m

3.9

0 m

FGL 0.30 m

Area of Foundation, Af

Sectional Modulus of Foundation, Zf

Weight of Foundation block, Wf

Weight of Structure, Ws

Moment at the base of Foundation, Mf

Pressure less than 150kN/m2 Hence Safe

Vs

Ve Vs x Sb

Sb

Ve

qe 0.613 x Ve2

qe

SIG

NB

OA

RD

SIGNBOARD

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3.9

0 m

1.0

0 m

Length of Foundation, L = 3.9 mWidth of Foundation, B = 3.5 mDepth of Foundation, D = 1 m


= 7.96 m3

= 341.25 kN

= 20 kN


= 205.08 kN-m

1.2.2 Check for Bearing PressureMax. Pressure at bottom of Foundation = 52.22 kN/m2Min. Pressure at bottom of Foundation = 0.71 kN/m2

1.3 Reinforcement Calculation

Reinforcement Provided is 16 dia @ 200 c/c





Moment at the base of Foundation, Mf

Pressure less than 150kN/m2 Hence Safe

As the foundations provided are of block type, hence structural calculation is not required & reinforcement is provided as per engineering judgement

SIG

NB

OA

RD

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1.00 General Data

Unit weight of Concrete = 25

Unit weight of Reinforcement = 78.5

Bearing Capacity of Soil @ 1m below ground = 150

= 45 m/s

= (Equation 8, BS 6399-2:1997)

= 1 (Cl 2.2.2.2, BS 6399-2:1997)

= 1 (Cl 2.2.2.3, BS 6399-2:1997)

= 1 (Cl 2.2.2.4, BS 6399-2:1997)

= 1 (Cl 2.2.2.5, BS 6399-2:1997)

1.1 For Pylon - 1

1.1.1 Calculation of Loads

= 45 m/s

=

= 1.73 (Table 4, BS 6399-2:1997)

= 77.85 m/s

= (Equation 1, BS 6399-2:1997)

= 3.72 kN/m2


Effective area against wind = 32 m2Wind load on the frame = 118.89 kN

0.50 m 5.00 m

3.5

0 m

1.5

0 m

kN/m3

kN/m3

kN/m2

Vb (Basic wind speed)

Vs (site wind speed) Vb x Sa x Sd x Ss x Sp

Sa (Altitude factor)

Sd (Direction Factor)

Ss (Seasonal Factor)

Sp (Probability Factor)

Vs

Ve Vs x Sb

Sb

Ve

qe 0.613 x Ve2

qe

SIG

NB

OA

RD SIG

NB

OA

RD Case (I)

WindCase (II) Wind

A B

Length of Foundation, L = 5.5 mWidth of Foundation, B = 3.5 mDepth of Foundation, D = 1.5 m


= 11.23 m3

= 721.875 kN

= 20 kN


Moment at the base of Fdn due to wind, Mw = 772.75 kN-m

Case (I)

Moment about A = 1222.403 kN-mMoment about B = -2857.91 kN-m

Case (II)

Moment about A = 2767.910 kN-mMoment about B = -1312.40 kN-m

1.1.2 Check for Bearing Pressure

Max. Pressure at bottom of Foundation = 285.03 kN/m2Min. Pressure at bottom of Foundation = -215.97 kN/m2





A B

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