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    Design of Bearing For Beam B21: y X CK CK

    Uploaded by

    Mahadev D. Bhandare
    1. The document details the design of a bearing for a beam carrying a maximum vertical load of 1469.7 kN. 2. Key specifications of the bearing include a bottom plate 700 mm long and 300 mm wide with a thickness of 91 mm, supporting the beam over a 200 mm outstand. 3. Checks are performed to ensure the bearing stress, bending moment, and shear strength are within permissible limits based on the material properties and dimensions. Bolts and shear keys are also designed to transfer the load.

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

    Design of Bearing For Beam B21: y X CK CK

    Uploaded by

    Mahadev D. Bhandare
    41 views7 pages
    1. The document details the design of a bearing for a beam carrying a maximum vertical load of 1469.7 kN. 2. Key specifications of the bearing include a bottom plate 700 mm long and 300 mm wide with a thickness of 91 mm, supporting the beam over a 200 mm outstand. 3. Checks are performed to ensure the bearing stress, bending moment, and shear strength are within permissible limits based on the material properties and dimensions. Bolts and shear keys are also designed to transfer the load.

    Original Description:

    Calculation and design girder bearing as per IS code.

    Original Title

    Bearing design 1

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    1. The document details the design of a bearing for a beam carrying a maximum vertical load of 1469.7 kN. 2. Key specifications of the bearing include a bottom plate 700 mm long and 300 mm wide with a thickness of 91 mm, supporting the beam over a 200 mm outstand. 3. Checks are performed to ensure the bearing stress, bending moment, and shear strength are within permissible limits based on the material properties and dimensions. Bolts and shear keys are also designed to transfer the load.

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    41 views7 pages

    Design of Bearing For Beam B21: y X CK CK

    Uploaded by

    Mahadev D. Bhandare
    1. The document details the design of a bearing for a beam carrying a maximum vertical load of 1469.7 kN. 2. Key specifications of the bearing include a bottom plate 700 mm long and 300 mm wide with a thickness of 91 mm, supporting the beam over a 200 mm outstand. 3. Checks are performed to ensure the bearing stress, bending moment, and shear strength are within permissible limits based on the material properties and dimensions. Bolts and shear keys are also designed to transfer the load.

    Copyright:

    © All Rights Reserved
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    of 7
    At a glance
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    The document discusses the design of a bearing plate for a beam including dimensions, material properties, and stress calculations.

    The bearing plate has a length of 700mm, width of 300mm and thickness of 91mm. It is made of steel with a yield strength of 30MPa.

    The maximum vertical load is 1469.7kN and maximum horizontal load is 741.001kN as seen in the force tables on pages 6 and 7.

    Design of bearing for beam B21

    Maximum factored vertical load F y = 1469.7 kN


    Maximum factored axial load F x = 0.0 kN
    fck = 30 MPa
    Permissible bearing stress = 0.45 f ck = 13.5 MPa

    Length of bottom plate L = 700 mm


    Width of bottom plate B = 300 mm

    Thickness of plates, t = 91 mm
    (P3, P4, P5, P6 welded together)

    Actual bearing stress sb = Fy/(L x B) = 7.0 MPa < 13.5 OK

    Width of beam, bf = 300 mm

    Outstand of bottom plate beyond beam l = (700 - 300)/2 = 200 mm


    BM in outstand M = sb x B x l2/2 = 42.0 kN.m
    Shear in outstand V = sb x B x l = 419.9 kN

    Plastic modulus of plate Zp = Bt2/4 = 621075 mm3


    Yield stress fy = (𝐵×𝑡×𝑓_𝑦 230 MPa
    )/(𝛾_𝑚0
    gm0 = √3)= 1.1
    Design shear strength Vd = 3295.6 kN

    V<0.6 Vd. Hence, bending strength Md= bbZpfy/gm0


    bb = 1.0. Hence, Md = 129.9 kN.m > 42.0 OK

    The top plate of the bearing is not subjected to bending or shear. Hence, nominal thickness is provided.

    For bottom plate:


    Bolt diameter = 36 mm
    Hole diameter = 39 mm
    Property class of bolt 8.8
    Bolt shank area = 1017.9 mm2
    Thread pitch = 4 mm
    Net area of bolt = 816.7

    Ultimate stress of bolt fu = 830 MPa


    Yield stress of bolt = 640 MPa

    nn = 0
    𝑉_𝑑𝑠𝑏=𝑓_𝑢/(𝛾_𝑚𝑏 √3) (𝑛_𝑛 𝐴_𝑛𝑏+𝑛_𝑠 𝐴_𝑠𝑏 )=
    ns = 1
    gmb = 1.25

    Bolt strength 390.2 kN

    Provide 2 Nos. bolts


    Shear strength = 780.4 kN > 0.0 OK

    Bolt bearing against concrete


    Bolt length in concrete Lb = 150 mm
    Bolt strength in bearing = Nb db Lb x 0.45 fck = 145.8 kN > 0.0 OK

    Shear keys of dimension 40 x 40 x 150 LG are also provided below the bearing plate

    Design of lead plate


    A lead plate is sandwiched between the top and bottom plates so as to allow free rotation.
    Permissible bearing
    *Mark’s standard stress in for
    handbook leadmechanical
    = 9 MPa
    engineers, 2007, pg.6-10.
    Plate length = 500 mm
    Plate width = 220 mm
    Thickness = 3 mm
    Beam depth = 1400 mm
    Beam span =
    h' (lever arm of force) = 700 mm

    Bearing area = 0.11 m2


    Z = BL2/6 = 0.009 m3

    Forces tabulated below are factored. Hence the final stresses shall be divided by factor 1.5

    Node L/C FX P=FY FZ MX MY MZ P/A/1.5 Check


    (kN) (kN) (kN) (kN.m) (kN.m) (kN.m) (MPa)
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    46 106 -18.843 741.001 -24.957 0 0 0 4.490915 OK
    34 104 0 1469.652 0 0.15 0 0 8.906982 OK
    1 105 0 741.001 0 -0.05 0 0 4.490915 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    1 106 0 741.001 -26.229 -0.05 0 0 4.490915 OK
    34 104 0 1469.652 0 0.15 0 0 8.906982 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    1 104 0 1461.794 0 -0.105 0 0 8.859358 OK
    CHECK: OK
    104 0
    106 0
    104 0
    105 0
    104 0
    106 0
    104 0
    104 0
    104 0
    104 0
    104 0
    104 0
    Max Fx 1 104 0 1461.794 0 -0.105 0 0
    Min Fx 46 106 -18.843 741.001 -24.957 0 0 0
    Max Fy 34 104 0 1469.652 0 0.15 0 0
    Min Fy 1 105 0 741.001 0 -0.05 0 0
    Max Fz 1 104 0 1461.794 0 -0.105 0 0
    Min Fz 1 106 0 741.001 -26.229 -0.05 0 0
    Max Mx 34 104 0 1469.652 0 0.15 0 0
    Min Mx 1 104 0 1461.794 0 -0.105 0 0
    Max My 1 104 0 1461.794 0 -0.105 0 0
    Min My 1 104 0 1461.794 0 -0.105 0 0
    Max Mz 1 104 0 1461.794 0 -0.105 0 0
    Min Mz 1 104 0 1461.794 0 -0.105 0 0

    104 1469.652
    106
    104
    105
    104
    106
    104
    104
    104
    104
    104
    104

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