Base-Plate INDIA CODE.xls

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    1 Design forces

    Factored Axial load Pu = KN From analysis

    Nature of axial load =

    Factored Shear force Fy = KN

    Dia of anchor bolts (HT bolts) = M mm

    No of bolts = Nos

    Grade of bolts =

    Ultimate Tensile strength of bolt fu = Mpa

    Ultimate Tesile strength of plate fcu = Mpa

    Yield stress of plate fy = Mpa

    Yield stress of bolt fyb = Mpa

    Cube compressive strength of concrete fck = Mpa2 Geometric properties

    Column section =

    Depth of section = mm

    Width of flange = mm

    Clearence of holes = mm

    Dia of holes = Nominal dia of bolt + clearence = mm

    Minimum Edge distance = mm Clause 10.2.4

    Maximum edge distance = 12t IS:800:2007

    = mm

    = (250/fy)1/2

    =

    Edge distance provided = mm

    O.K

    50

    16

    400

    140

    150

    20

    50

    250

    33

    22

    150

    192

    150

    100

    200

    2525

    450

    30

    250

    ISMB

    250

    400

    100

    17

    Compression

    References

    2

    140

    2

    1

    150

    4

    20

    8.8

    S.No

    Design of base plate

    Project/Client :-

    Calculations

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    Minimum spacing of bolts (2.5 d) = mm Clause 10.2.2 &

    Maximum spacing of bolts (lesser of 32t or 300) = mm 10.2.3

    Spacing of bolt provided = mm IS:800:2007

    O.K

    3 Check for base pressure

    Bearing pressure of plate w = Pu/Ap

    = Mpa

    Allowable bearing pressure = 0.6fck

    = Mpa

    Safe

    4 Check for Minimum Thickness of base plate Clause 7.4.3.1

    Thickness of plate required IS:800:2007

    ts = mm

    Thickness of plate required = mm

    Safe

    4 Check for shear capacity of bolts Clause 10.3.3

    Design shear strength of bolt, Vdsb = Vnsb/mb IS:800:2007

    Nominal shear capacity, Vnsb

    Vnsb = KN

    Vdsb = KN

    Calculated shear force per bolt Vd = KN

    Safe

    5 Check for bearing capacity of bolts Clause 10.3.4

    Design bearing strength of bolts Vdpb = Vnpb/mb IS:800:2007

    Vnpb = 2.5k bd t fu

    kb =

    Vnpb = KN

    Vdpb = KN

    Calculated bearing strength of bolt Vb = KN

    Safe

    6 Check for tension capacity of bolts

    Design tension capacity of bolt Tdp = Tnp/mb

    Nominal Tensile capacity of bolt

    Tnp = 0.9fubAn

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    fybAsb(mb/mo) = Mpa

    Nominal Tensile capacity of bolt Tnp = Mpa

    Design tension capacity of bolt Tdp = Mpa

    Calculated tension per bolt T = Mpa

    N.G

    7 Check for combined shear and tension

    N.G

    N.G

    N.G= N.G

    N.G

    N.G+

    N.G

    N.G

    N.G

    N.G

    > 1.0

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    1 Design forces

    Axial load Pu = KN From analysis

    Nature of axial load =

    Bending moment about xx Mx = KN.m

    Bending moment about yy My = KN.m

    Lataral force along xx Fx = KN

    Lataral force along yy Fy = KN

    Dia of anchor bolts (HT bolts) = M mm

    No of bolts = Nos

    2 Geometric properties

    Dia. Of pile = mm

    Width of column/pedestal = mm

    Depth of column/pedestal = mm

    Minimum spacing of piles = mm

    Centre to Centre distance of two adjacent pile = mm

    ReferencesS.No

    Design of base plate

    Project/Client :-

    Calculations

    156

    Compression

    0

    0

    0

    0

    300

    750

    4

    20

    450

    700

    As per IS:2911-

    Part-1, clause:5.6750

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    Edge projection from face of piles

    (Min 100-150mm) = mm

    Width of pile cap = mm

    Length of pile cap = mm

    Depth of pile cap ( assumed) = mm

    Clear cover to the reinforcement = mm

    Grade of concrete fck = Mpa

    Grade of Steel fy = Mpa

    3 Load calculations

    Weight of pile cap = KN

    Additional load due to moment = KN

    Total load on each pile = KN

    =

    4 Calculation of reinforcement

    a)Bending theoryBending moment about xx = KN.m

    Design bending moment = KN.m

    Dia of Main reinforcement = mm

    Dia of secondary reinforcement = mm

    Effective depth of pile cap = mm

    Mu/bd2 =

    pt = %

    pt,min = %

    Area of steel required = mm2

    b)Truss theory

    Tension at bottom = Pu/12ld(3l2-a

    2)

    = KN

    Area of steel required = mm2

    Area of steel required

    (max of bending & truss theory) = mm2

    No of bars required = Nos

    No of bars provided = Nos

    Area of steel provided = mm2

    5 Check for shear

    a)One way shear

    Percentage of steel provided = %

    = 0.87fy/6.89pt

    =

    Permissible shear stress, c = Mpa Clause 40.50.273

    4

    452.16

    0.145

    17.42

    97.69

    270.57

    373.68

    4

    0.2

    0.056

    0.12

    373.68

    12.15

    75

    20

    As per IS:2911-

    Part-1,

    150

    600

    1350

    519

    84.08

    O.K

    21.44

    32.161

    600

    12

    0

    12

    415

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    Nominal shear stress ,v = Mpa

    Shear span, av(C/C of pile/2-d/2+20% pile dia) = m

    Enhancement factor (2d/av) =

    Modified shear strength, v = Mpa

    1.57>0.41

    O K

    b)Two way shear

    Punching shear, V = KN

    Perrimeter of column, = mm

    Punching shear stress, = Mpa

    Permissible shear stress, = Mpa

    1.11803398874989>0.2

    O K

    1.118

    Clause 31.6.3

    IS:456-2000

    IS:456-2000

    1.57

    234

    2300

    0.2

    0.41

    0.18

    5.77

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    1 Design forces

    Factored Axial load Pu = KN From analysis

    Nature of axial load =

    Factored Shear force Fy = KN

    Dia of anchor bolts (HT bolts) = M mm

    No of bolts = Nos

    Grade of bolts =

    Ultimate Tensile strength of bolt fu = Mpa

    Ultimate Tesile strength of plate fcu = Mpa

    Yield stress of plate fy = Mpa

    Yield stress of bolt fyb = Mpa

    Cube compressive strength of concrete fck = Mpa2 Geometric properties

    Column section =

    Depth of section = mm

    Width of flange = mm

    Clearence of holes = mm

    Dia of holes = Nominal dia of bolt + clearence = mm

    Minimum Edge distance = mm Clause 10.2.4

    Maximum edge distance = 12t IS:800:2007

    = mm

    = (250/fy)1/2

    =

    Edge distance provided = mm

    Not OK

    4

    36

    8.8

    180

    144

    160

    25

    100

    1

    S.No

    Design of base plate

    Project/Client :-

    Calculations

    1100

    Tension

    References

    300

    12

    250

    BUILT-UP I SECTION

    250

    50

    500

    50

    160

    300

    400

    300

    2

    38

    400

    250

    57

    50

    160

    100

    400

    100

    200

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    Minimum spacing of bolts (2.5 d) = mm Clause 10.2.2 &

    Maximum spacing of bolts (lesser of 32t or 300) = mm 10.2.3

    Spacing of bolt provided = mm IS:800:2007

    O.K

    3 Check for base pressure

    Bearing pressure of plate w = Pu/Ap

    = Mpa

    Allowable bearing pressure = 0.6fck

    = Mpa

    Safe

    4 Check for Minimum Thickness of base plate Clause 7.4.3.1

    Thickness of plate required IS:800:2007

    ts = mm

    Thickness of plate required = mm

    Safe

    4 Check for shear capacity of bolts Clause 10.3.3

    Design shear strength of bolt, Vdsb = Vnsb/mb IS:800:2007

    Nominal shear capacity, Vnsb

    Vnsb = KN

    Vdsb = KN

    Calculated shear force per bolt Vd = KN

    Safe

    5 Check for bearing capacity of bolts Clause 10.3.4

    Design bearing strength of bolts Vdpb = Vnpb/mb IS:800:2007

    Vnpb = 2.5k bd t fu

    kb =

    Vnpb = KN

    Vdpb = KN

    Calculated bearing strength of bolt Vb = KN

    Unsafe

    6 Check for tension capacity of bolts

    Design tension capacity of bolt Tdp = Tnp/mb

    Nominal Tensile capacity of bolt

    Tnp = 0.9fubAn

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    fybAsb(mb/mo) = Mpa

    Nominal Tensile capacity of bolt Tnp = Mpa

    Design tension capacity of bolt Tdp = Mpa

    Calculated tension per bolt T = Mpa

    Unsafe

    7 Check for combined shear and tension

    Unsafe

    75

    34.56+

    289.02

    73.25

    58.6

    275

    > 1.0275

    58.6= 6.863

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