eccentric footing design 4.xls - Project Calculations for...

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Page 1 Project Calculations for Divn / Dept. Job Nr. / File No. Design of Eccentric footing subjected to Calculated by Date 05.12.2019 Sheet No. Axial force and Moment by LSD Checked by Date of
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Page 2 Project Calculations for Divn / Dept. Job Nr. / File No. Design of Eccentric footing subjected to Calculated by Date 05.12.2019 Sheet No. Axial force and Moment by LSD Checked by Date of Material Data fy = 415 N/mm2 fck = 20 N/mm2 Unit weight of soil = 16 kN/mm2 Depth of foundatioon = 2 Bearing capacity of the soil sbc = 80 KN/m2 at 1.5 m below NGL Size of column 0.23 m x 0.3 m 230 mm x 300 mm Area of column = 0.069 m2 Provide footing of size L = 2.13 m (OR) 2130 MM B = 2.13 m (OR) 2130 MM Area of footing provided = 4.54 m2 Support reaction = 120 Soil load (4.54 - 0.069 ) x 2 x 16 = 143 Total = 263 KN Assume 1 m wide footing 1 PX x 1 = 263 2 1 x 80 x X = 263 2 X = 263 40 Area of footing = 6.6 m2 Size of footing = 2.57 m Eccentricity = 1 x 2.13 - 0.23 3 2 = 0.71 - 0.12 = 0.59 m Moment due to eccentricity = 120 x 0.59 = 70.8 KnM Additional moment = 22.5 KnM Total = 70.8 + 22.5 = 93 KnM CHECK FOR BASE PRESSURE = P + M A Z = 263 + 93 x 6 2.13 x 2.13 2.13 x 4.5369 = ### + 57.74 Max. Pressure = 115.71 KN/m2 Min. Pressure = 0 KN/m2
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Page 3 Project Calculations for Divn / Dept. Job Nr. / File No.
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