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Uplift Check

The document contains bouyancy checks for several columns marked BW1 through BW18. It provides information on the ground water table, basement level, slab thickness, water bouyancy pressure, tributary area of each column, uplift force due to water, dead weight of each pile, and calculated net loading. For some columns there is no uplift, while for others the uplift is less than the engineer's estimates and within acceptable limits.

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Madushike Jayawickrama
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611 views6 pages

Uplift Check

The document contains bouyancy checks for several columns marked BW1 through BW18. It provides information on the ground water table, basement level, slab thickness, water bouyancy pressure, tributary area of each column, uplift force due to water, dead weight of each pile, and calculated net loading. For some columns there is no uplift, while for others the uplift is less than the engineer's estimates and within acceptable limits.

Uploaded by

Madushike Jayawickrama
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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Bouyancy Check

Column Marking BW21 (BW19 similar)

Ground Water Table approximate at RL 105.6 m

Basement 2 at RL 100.0 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 59.4 kN/m2

Tributary Area of Column = 6.5 x 4.5 = 29.25 m2

Uplift due to water = 29.25 x 59.4


= 1736 kN

Dead weight on pile (exclude pilecap) = 2475 kN

Net Loading = 739 kN (No Uplift)

Bouyancy Check

Column Marking BW20

Ground Water Table approximate at RL 105.60 m

Basement 2 at RL 100.550 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 54.0 kN/m2

Tributary Area of Column = 8.5 x 3 = 25.5 m2

Uplift due to water = 25.5 x 54.0


= 1376 kN

Dead weight on pile (exclude pilecap) = 1185 kN

Net Loading = -191 kN (Uplift Force)


< PE's -46T, OK
Bouyancy Check

Column Marking BW3 (BW2 similar)

Ground Water Table approximate at RL 105.60 m

Basement 2 at RL 100.335 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 56.1 kN/m2

Tributary Area of Column = 8.5 x 3 = 25.5 m2

Uplift due to water = 25.5 x 56.1


= 1430 kN

Dead weight on pile (exclude pilecap) = 1185 kN

Net Loading = -245 kN (Uplift Force)


< PE's -65T , OK

Bouyancy Check

Column Marking BW4 (BW1, BW5 to BW15 similar)

Ground Water Table approximate at RL 105.60 m

Basement 2 at RL 102.575 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 34.1 kN/m2

Tributary Area of Column = 6.5 x 3.3 = 21.45 m2

Uplift due to water = 21.45 x 34.1


= 731 kN

Dead weight on pile (exclude pilecap) = 912 kN

Net Loading = 181 kN (No Uplift)


Bouyancy Check

Column Marking BW17

Ground Water Table approximate at RL 105.60 m

Basement 2 at RL 101.125 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 48.3 kN/m2

Tributary Area of Column = 6.75 x 3 = 20.25 m2

Uplift due to water = 20.25 x 48.3


= 978 kN

Dead weight on pile (exclude pilecap) = 984 kN

Net Loading = 6 kN (No Uplift)

Bouyancy Check

Column Marking BW18

Ground Water Table approximate at RL 105.60 m

Basement 2 at RL 100.84 m

Basement Slab Thickness 0.45 m

Water Bouyancy Pressure 51.1 kN/m2

Tributary Area of Column = 8.5 x 3 = 25.5 m2

Uplift due to water = 25.5 x 51.1


= 1303 kN

Dead weight on pile (exclude pilecap) = 1185 kN

Net Loading = -118 kN (Uplift Force)


approx to PE's -10T , OK

Dead weigth on pile (include pilecap) = 1195 kN

Net Loading = -109 kN approx to PE's -10T , OK

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