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    Eccentric Footing

    Uploaded by

    Megatech Engineering Consultants
    The document provides details for designing an eccentric footing, including load parameters, dimensions, material properties, and calculations. The footing has a total eccentric load of 223.803 kN and moment of 102.65 kNm. Calculations show the maximum pressure is safe, reinforcement requirements are met, and the footing resists overturning and shear forces. The design of the eccentric footing is verified to meet all check criteria.

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    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd

    Eccentric Footing

    Uploaded by

    Megatech Engineering Consultants
    78 views13 pages
    The document provides details for designing an eccentric footing, including load parameters, dimensions, material properties, and calculations. The footing has a total eccentric load of 223.803 kN and moment of 102.65 kNm. Calculations show the maximum pressure is safe, reinforcement requirements are met, and the footing resists overturning and shear forces. The design of the eccentric footing is verified to meet all check criteria.

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    The document provides details for designing an eccentric footing, including load parameters, dimensions, material properties, and calculations. The footing has a total eccentric load of 223.803 kN and moment of 102.65 kNm. Calculations show the maximum pressure is safe, reinforcement requirements are met, and the footing resists overturning and shear forces. The design of the eccentric footing is verified to meet all check criteria.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    78 views13 pages

    Eccentric Footing

    Uploaded by

    Megatech Engineering Consultants
    The document provides details for designing an eccentric footing, including load parameters, dimensions, material properties, and calculations. The footing has a total eccentric load of 223.803 kN and moment of 102.65 kNm. Calculations show the maximum pressure is safe, reinforcement requirements are met, and the footing resists overturning and shear forces. The design of the eccentric footing is verified to meet all check criteria.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    of 13

    Eccentric Footing

    (Give Input only in Yellow Box)

    Grade of Concrete m 25

    Grade of Steel Fe 500

    S.B.C of the Soil 300 kN/m2

    size of the footing (assumed) 2.28 x 2.5 m

    Thickness of Footing 500 mm d

    Dimentions of column 0.23 X 0.6 m

    Depth of the footing 0.675 m Angle of dispersion

    Density of Soil 18 KN/m3

    Axial load from the column 1200 kN

    Moment from the column 30 kNm

    weight due to soil above footing 67.5783 kN


    including wedge

    C.G of footing from top 1.25 m

    C.G of column from top 0.3 m

    C.G of the load from top 0.351 m

    Eccentricity from C.G of footing 0.899 m

    Moment due to eccentricity 1079.22 kNm

    Total Load P 1267.578 m

    Total moment M 1109.22 kNm


    P/A 222.3822 kN/m2

    M/Z 467.0414 kN/m2

    Check
    P/A + M/Z 689.4235 kN/m2 Revise

    P/A - M/Z -244.659 kN/m2 Tension Exceeded

    Moment Mu 1086.49 kNm

    Ast Required 9978.649 mm2

    Ast Min 600 mm2

    Provide 32 at 50 mm centres

    Ast Provided 16077 mm2

    Check for Shear

    One Way Shear 278.4

    Shear force at the distance D from the


    column face V 23.6 kN

    Vu 35.46 kN

    TV 0.070913 Check
    Safe
    TC 0.946118

    Two Way Shear

    Punching shear 5252.89 kN

    Stress 4.323366 Check


    Revise
    Tc' 1.104167

    Check for Over Turning

    Total overturning Moment 1109.22 kNm

    Resisting Moment
    due to Soil Above Footing 84.47 kNm

    due to Self weight of Footing 89.0625 kNm

    Total Moment 173.5 kNm Check

    Factor of Safety 0.1 Revise


    0.300

    0.351

    450 m

    o
    30

    One Way Shear

    2.5 m

    kN/m2 -244.659

    278.4
    1.4 m

    Two Way Shear

    n Exceeded
    250 mm
    1.25

    500 mm

    kN/m2
    689.424 kN/m2
    1.1 m
    Eccentric Footing
    (Give Input only in Yellow Box)

    Grade of Concrete M 25

    Grade of Steel Fe 500

    S.B.C of the Soil 350 kN/m2

    size of the footing (assumed) 1.8 x 2.4 m

    Thickness of Footing 300 mm d

    Dimentions of column 0.3 X 0.3 m

    Depth of the footing 1.75 m

    Density of Soil 18 KN/m3

    Axial load from the column 81 kN

    Moment from the column 50 kNm

    Gap between column face and Found 400 mm

    Self weight of foundation 32.4 kN

    Weight of soil above Foundation (Rec) 110.403 kN

    Total load on foundation except Axial Load 142.803 kN

    C.G of footing from top 1.2 m

    C.G of column from top 0.55 m

    C.G of the load from top 0.965 m

    Eccentricity from C.G of footing 0.235 m

    Moment due to eccentricity 52.65 kNm


    Total Load P 223.803 m

    Total moment M 102.65 kNm

    Ecentricity 0.4586623056885 M > 0.4

    Maximum Pressure 111.811392616 kN/m2


    Safe

    Footing Contact 2.22401308293 m


    Length Top Reinforcement Required

    Intensity at 0 kN/m2
    other end

    Moment Mu 92.1742222222 kN/m2

    Ast Required 914.977559143 KN-m

    Ast Min 360 mm2

    Dia of Bar 12

    Spacing of Bar Required 123.606676906 mm


    Critical Section
    Spacing of Bar Provided 110 mm

    Ast Provided 1028.16 mm2

    Check for Shear

    load Coming on Footing Due to Soil & Foundation 33.6 Kn/m

    Shear at critical face 15.68833 kN

    ζv 0.09413 N/mm2

    pt 0.411
    β 7.06

    ζc 0.45098 N/mm2 Safe in Shear

    Two Way Shear

    Wu 77.709375

    Stress Vu 317.5399 kN

    ζv 0.907257 N/mm2

    β 1.5

    Ks 1

    ζc 1.25 N/mm2 Safe in Shear

    Check for Over Turning

    Total overturning Moment 102.65 kNm

    Resisting Moment
    due to Soil Above Footing and foundation weight 171.36 kNm

    Factor of Safety 1.5 Safe


    0.55

    1.2

    CG of whole System 2.4


    0.2352515
    CG of Dead Load

    250 m

    o
    1.8

    One Way Shear


    175.82

    250 250

    Critical Section 250


    For Oneway
    Shear 84.160357
    2.4

    1.85
    33.6
    Kn/m

    1.8
    125 125 0.425

    125

    0.55 2.4

    1.8

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