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    Elastomeric Bearings RCC Bridge Over R. Subarnarekha On Purulia-Ranchi Road

    Uploaded by

    Rudranath Bhattacharya
    This document contains design calculations for elastomeric bearings for a bridge over the River Subarnarekha in India. It provides design parameters such as load values and dimensions for the bearings. The calculations then check that the design meets standards for compressive stress, translation, rotation, friction, and total shear stress. The bearings pass all design checks at both initial and revised load values.

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    © All Rights Reserved
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    Elastomeric Bearings RCC Bridge Over R. Subarnarekha On Purulia-Ranchi Road

    Uploaded by

    Rudranath Bhattacharya
    41 views3 pages
    This document contains design calculations for elastomeric bearings for a bridge over the River Subarnarekha in India. It provides design parameters such as load values and dimensions for the bearings. The calculations then check that the design meets standards for compressive stress, translation, rotation, friction, and total shear stress. The bearings pass all design checks at both initial and revised load values.

    Original Description:

    Original Title

    701811_Elastomeric Bearing_Design

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    This document contains design calculations for elastomeric bearings for a bridge over the River Subarnarekha in India. It provides design parameters such as load values and dimensions for the bearings. The calculations then check that the design meets standards for compressive stress, translation, rotation, friction, and total shear stress. The bearings pass all design checks at both initial and revised load values.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    41 views3 pages

    Elastomeric Bearings RCC Bridge Over R. Subarnarekha On Purulia-Ranchi Road

    Uploaded by

    Rudranath Bhattacharya
    This document contains design calculations for elastomeric bearings for a bridge over the River Subarnarekha in India. It provides design parameters such as load values and dimensions for the bearings. The calculations then check that the design meets standards for compressive stress, translation, rotation, friction, and total shear stress. The bearings pass all design checks at both initial and revised load values.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    The document discusses the design calculation of elastomeric bearings for a bridge over the Subarnarekha River on the Purulia-Ranchi Road in India.

    The design calculation is for elastomeric bearings that will be used in an RCC bridge over the Subarnarekha River on the Purulia-Ranchi Road in India.

    The design parameters considered include the maximum and minimum vertical loads, maximum horizontal load, permissible translations and rotations.

    Doc No: 701811-EB-DESIGN-R01

    Ref: 701811 Design Calculation


    Date: May 28, 2015

    Project: RCC bridge over R. Subarnarekha on


    Prep. By: SYM Approved: SMA Page 1 of 3
    Purulia-Ranchi Road

    Elastomeric Bearings
    RCC Bridge over R. Subarnarekha on
    Purulia-Ranchi Road

    DESIGN CALCULATION FOR Elastomeric


    BEARINGS

    CLIENT: Millenium Road Construction Company

    mageba BRIDGE PRODUCTS PVT. LTD.


    KOLKATA
    Page 2 of 3
    Rev. 1

    CLIENT: Millenium PROJECT: RCC Bridge over river Subarnarekha on


    Road Construction Purulia-Ranchi Road
    Company
    DESIGN OF REINFORCED ELASTOMERIC BEARING

    1.0 REFERENCE:
    Drawing No. 2-eb C 08 3 -701811 R0 Reference : IRC:83 (Part-II)

    2.0 DESIGN PARAMETERS :


    Design Vertical Load, Nmax = 454.7 KN Translation Long, Ƴd long = 54 mm
    Design Horizontal Load, Hmax = 55.5 KN Translation Lat, Ƴd lat = 54 mm
    Minimum Vertical Load, Nmin = 192.0 Rotation Long, ɑ long = 4.74E-03 mm
    Grade of Concrete = M35 Rotation Lat, ɑ lat = 4.64E-03 mm

    3.0 BEARING PARAMETERS :


    Length, lo = 280.0 mm No of Elastomer Layer, n = 3.0
    Width, bo = 320.0 mm No of Steel Laminate, n+1 = 4.0
    Total Height, ho = 48.0 mm Side Cover, C = 6.0 mm
    Thickness of individual elastomer layer, hi = 8.0 mm Top & Bottom Cover, he = 6.0 mm
    Thickness of steel laminate, hs = 3.0 mm Effective Area, (lo-2c)x(bo-2c) = 82544.0 mm2
    Total Elastomer thickness, h = 36.0 mm

    4.0 DESIGN CHECK :


    4.1 Compressive Stress (Cl 916.3.3)
    Allowable max compressive stress = 10 Mpa
    Allowable min compressive stress = 2.0 Mpa
    Maximum Compressive Stress, σmax=Nmax/A = 5.5 Mpa HENCE OK
    Minimum Compressive Stress, σmin=Nmin/A = 2.3 Mpa HENCE OK
    Shape factor, S=0.5x(lxb)/(l+b)xhi = 8.96 <=12 HENCE OK

    4.2 Translation (Cl. 916.3.4) :


    Allowable Shear strain, Ƴd = 0.7
    Shear Stress, Ԏm=H/A = 0.67 Mpa
    Shear strain, Ƴd=∆bd/h+Ԏmd = 0.672 <Ƴd HENCE OK

    4.3 Rotation (Cl. 916.3.5) :


    β=σm/10 = 0.6
    Max perm. Rotation angle along b, ɑbi max=0.5xσmxhi/bxS2 = 1.62E-03 <ɑ HENCE OK
    Design Rotation = 0.0027 rad

    4.4 Friction (Cl. 916.3.6)


    0.2+0.1xσm = 0.75 >Ƴd HENCE OK

    4.5 Total shear stress (Cl. 916.3.7)


    Ԏc=1.5xσm/s = 0.92
    ԎƳ=Ƴd = 0.67
    Ԏɑ=0.5x(b/hi)^2 = 2.41
    Ԏc+ԎƳ+Ԏɑ = 4.0 <5 HENCE OK
    Page 3 of 3
    Rev. 1

    CLIENT: Millenium PROJECT: RCC Bridge over river Subarnarekha on


    Road Construction Purulia-Ranchi Road
    Company
    DESIGN OF REINFORCED ELASTOMERIC BEARING

    1.0 REFERENCE:
    Drawing No. 2-eb C 08 3 -701811 R0 Reference : IRC:83 (Part-II)

    2.0 DESIGN PARAMETERS :


    Design Vertical Load, Nmax = 749.7 KN Translation Long, Ƴd long = 54 mm
    Design Horizontal Load, Hmax = 55.5 KN Translation Lat, Ƴd lat = 54 mm
    Minimum Vertical Load, Nmin = 289.0 KN-M Rotation Long, ɑ long = 7.64E-03 mm
    Grade of Concrete = M35 Rotation Lat, ɑ lat = 5.32E-03 mm

    3.0 BEARING PARAMETERS :


    Length, lo = 280.0 mm No of Elastomer Layer, n = 3.0
    Width, bo = 320.0 mm No of Steel Laminate, n+1 = 4.0
    Total Height, ho = 48.0 mm Side Cover, C = 6.0 mm
    Thickness of individual elastomer layer, hi = 8.0 mm Top & Bottom Cover, he = 6.0 mm
    Thickness of steel laminate, hs = 3.0 mm Effective Area, (lo-2c)x(bo-2c) = 82544.0 mm2
    Total Elastomer thickness, h = 36.0 mm

    4.0 DESIGN CHECK :


    4.1 Compressive Stress (Cl 916.3.3)
    Allowable max compressive stress = 10 Mpa
    Allowable min compressive stress = 2.0 Mpa
    Maximum Compressive Stress, σmax=Nmax/A = 9.1 Mpa HENCE OK
    Minimum Compressive Stress, σmin=Nmin/A = 3.5 Mpa HENCE OK
    Shape factor, S=0.5x(lxb)/(l+b)xhi = 8.96 <=12 HENCE OK

    4.2 Translation (Cl. 916.3.4) :


    Allowable Shear strain, Ƴd = 0.7
    Shear Stress, Ԏm=H/A = 0.67 Mpa
    Shear strain, Ƴd=∆bd/h+Ԏmd = 0.672 <Ƴd HENCE OK

    4.3 Rotation (Cl. 916.3.5) :


    β=σm/10 = 0.9
    Max perm. Rotation angle along b, ɑbi max=0.5xσmxhi/bxS2 = 1.62E-03 <ɑ HENCE OK
    Design Rotation = 0.0044 rad
    4.4 Friction (Cl. 916.3.6)
    0.2+0.1xσm = 1.11 >Ƴd HENCE OK

    4.5 Total shear stress (Cl. 916.3.7)


    Ԏc=1.5xσm/s = 1.52
    ԎƳ=Ƴd = 0.67
    Ԏɑ=0.5x(b/hi)^2 = 2.41
    Ԏc+ԎƳ+Ԏɑ = 4.6 <5 HENCE OK

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