rectangular combined footing design result.pdf

7/29/2019 Rectangular Combined Footing Design Result.pdf

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Design Result for Rectangular Combined Footing - Ulitimate Strength Design (USD)

Project Details

Project Name

Project Location

Owner

Design Parameters

Dimention of Column 1 = 0.3 mm x 0.3 mm

Dimention of Column 2 = 0.3 mm x 0.3 mm

Column 1 Live Load = 320 KN

Column 1 Dead Load = 500 KN

Column 2 Live Load = 350 KN

Column 2 Dead Load = 500 KNSpacing Between Two Columns = 4.2 meters

Depth fron NG to Base of Footing = 2 meters

Soil Bearing Capacity = 200 KPa

Unit Weight of Soil = 18 KN/m^3

Unit Weight of Concrete = 24 KN/m^3

fc' = 25 MPa

fy = 300 MPa

Main Reinforcement Bar = 14 mmSolving for Size of Footing

P1 = 0.00467 KN

x1 = 0.00015 meters

P2 = 0.00583 KN

x2 = 4.20015 meters

P = 1670 KN

xg = 2.138 meters

qe = 159.86 KPa

Aftg = 10.45 m square

L = 4.28 meters

B = 2.4 metersDepth of Footing Pu1 = 1244 KN

Pu2 = 1295 KN

Pu = 2539 KN

qu = 247.177 KPa

d = 600 mmCheck "d" for two-way or punching shear:

For Column 1 bo = 1.2 meters

Vu = 1199.44 KN

Vc = 1200000 KN

oVc = 1020 KN Insuficient effective depth


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For Column 2 bo = 2.4012 meters

Vu = 1205.93 KN

Vc = 2401200 KN

oVc = 2041.02 KN OKCheck "d" for one-way or wide beam shear:

Vu1 = -887.9 KN

Vu2 = 891.6 KN

Vu3 = 128.6 KNMax Vu = 891.6 KNVc = 1200000 KN

oVc = 1020 KN OKUse d = 600 mm

Total Depth = 690 mmDesign of Main Bars Along Length

w1 = 4146667 KN/m

w2 = 4316667 KN/m

wu = 593.22 KN/m

v1 = 1243.822 KN

v2 = 0 KN

v3 = 1247.524 KN

v4 = -47.298 KNM1 = -0.19 KN-m

M2 = -1304.33 KN-m

M3 = 7.25 KN-m

M4 = 1.88 KN-mpmax = 0.0301

pmin = 0.00467Section 1 2 3 4

Moment, Mu -0.19 -1304.33 7.25 1.88

Ru 0.00024 1.67738 0.00932 0.00242

p 0 0.00583 0.00003 0.00001

Use p 0.00467 0.00583 0.00467 0.00467

As 6725 8395 6725 6725

Number of bars, N 43.686 54.535 43.686 43.686

Use N 44 55 44 44

Location Top Top Bottom Bottom

Design of Main Bars Along Width

Column 1 b = 450.3 mm

d = 586 mm

Mu1 = 80.12 KN-mColumn 2 b = 450.3 mm

Mu2 = 80.12 KN-m


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Section Column 1 Column 2

Moment, Mu 80.12 80.12

Ru 0.57571 0.57571

p 0.00195 0.00195

Use p 0.00467 0.00467

As 1232 1232

Number of bars, N 8.003 8.003

Use N 9 9

Location Bottom BottomDevelopment Length

Ld = 252 mm

Minim um Ld Furnished = 1125 m m OK! No need to bend the barsUse 4.28 m x 2.4 m footing with an effective depth to top bars of600 mm (total depth = 690 mm), with 99 pcs -

14 mm bars for top location on long direction, 88 pcs - 14 mm bars for bottom location on long direction, 9 pcs

- 14 mm bars for column 1 location on short direction and 9 pcs - 14 mm bars for column 2 location on short

direction of the footing, and at least two column bars m m bars must be extended in the footing.

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rectangular combined footing design result.pdf

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