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  • Hot-rolled - Floor plate

    Durbar® is hot-rolled structural steel floor plate which can reduce construction costs.

    Durbar’s distinctive, raised surface pattern is extremely slip-resistant at all angles – allowing plates to be used in any direction. Its self-draining surface is easy to clean and reduces corrosion.

    Ympress® for weight savings and component strength

    Ympress® is Tata Steel’s hot-rolled HSLA product. It is highly formable and delivers weight savings and increased component strength. The result is lighter, stronger, more consistent products.

    Ympress® adds value to automotive, lifting and excavating and shipbuilding applications, among others.

    Contact us

    Tata Steel

    PO Box 10.000

    1970 CA IJmuiden

    Netherlands

    Helpdesk

    T +31 (0)251 494191

    Overview

    Applications

    Bridges
    Cladding and protective barriers
    Commercial vehicles
    Containers
    Lifts
    Offshore installations
    Shipbuilding
    Stairs and walkways
    Steps and safety platforms


    Limitation of use statement

    EN10025-1:2004 CE Approved Factory Production Control Certificate
    0038/CPD/20060004/A (Limitations of Use “Floor Plate Applications”)


    Relationship with standards

    Durbar meets the mechanical and chemical properties of EN 10025-2: 2004
    and is available in grades S235JR+AR, S275JR+AR and S355JR+AR.


    Load span data

    Members of The Steel Construction Institute can view load span data for Durbar at www.steelbiz.org, in table C242, floor plates simply supported, from the Steel Designers Manual, 6th Edition, 2003.

     

     

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    Properties

    Mechanical properties

    The mechanical properties of Durbar® comply with EN 10025-2: 2004 and are shown in the table below. The values shown for strength and elongation are for test pieces taken transverse to the rolling direction; those for the impact test are for test pieces taken in the rolling direction.

    Grade

    Min. yield strength 1

    ReL

    Tensile strength
    Rm

    Min. elongation after fracture A

    Impact test

     

    N/mm2

    N/mm2

    %

     

     

     

     

    L0 = 5.65√S0

    Temp. °C

    Min. energy J

     

     

     

    3 ≤ t ≤ 12.5

     

     

    S235JR+AR

    235

    360 - 510

    24

    20

    27

    S275JR+AR

    275

    410 - 560

    21

    20

    27

    S355JR+AR

    355

    470 - 630

    20

    20

    27

    1. Lower yield strength or 0.2% proof stress applies.
    t - material thickness in mm.

     

    Chemical composition

    The chemical composition of Durbar® complies with EN 10025-2: 2004 and is shown in the table below.

    Grade

    C

    Mn

    P

    S

    Si

    N

     

    Max.

    Max.

    Max.

    Max.

    Max.

    Max.

    S235JR+AR

    0.17

    1.40

    0.035

    0.035

    -

    0.012

    S275JR+AR

    0.21

    1.50

    0.035

    0.035

    0.012

    S355JR+AR

    0.24

    1.60

    0.035

    0.035

    0.55

    0.012

    All values in weight%.

     

     

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    Dimensions

     

    Dimensions in mm.

    Thickness

    Standard width

     

     

     

    S235JR+AR

    S275JR+AR

    S355JR+AR

    3.00

    1250

    1250

    1250

    4.50

    1500

    1500

    1500

    6.00

    1500

    1500

    -

    8.00

    1500

    1500

    -

    10.00

    1500

    1500

    -

    12.50

    1500

    1500

    -

    Widths of 1000mm (minimum), 1750mm and 1830mm are also available –
    please contact us.
    Please also contact us for details for any other non-standard dimensions.

     

    Tolerances

    Tolerances for wide strip and slit wide strip comply with standard EN 10051: 2010 (click here).

    Tighter tolerances are available, please contact us.

     

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    Design

     

    Using Durbar®

    Durbar is a non-slip raised pattern floor plate of integral manufacture (the pattern is rolled in not welded). The "tear drop" studs are distributed to give maximum slip resistance in a variety of applications whilst ensuring a free draining surface.

    The nominal gauge of Durbar is the thickness of the plain plate exclusive of pattern.

    Weight per Unit Area

    Thickness on plainMass
    (mm)(kg/m)
    3 27
    4.5 39
    6 50
    8 66
    10 82

    12.5

    101

    Capacity Tables

    It is usual to consider floor plates as supported on all four edges although stiffeners or joint covers may only support two edges. If the plates are securely bolted or welded to the supporting system, they may be considered as encastré. This increases the load carrying capacity slightly but reduces the deflection considerably.

    The thickness given is exclusive of any raised pattern i.e. on plain.
    The breadth is the smaller dimension and the length the greater, irrespective of the position of the main support members.
    The maximum uniformly distributed load on the plate (w) is given by Pounder's formula and the maximum skin stress is limited to the design strength py

    For calculating the maximum deflection (dmax) at serviceability, the uniformly distributed imposed load (wimp) on the plate is derived as follows.

    w = gdead wdead + gimp wimp
    wimp = (w - gdead wdead)/ gimp

    For plates simply supported on all four edges

    This formula assumes that there is no resistance to uplift at plate corners.

    w = a1 py t2 / k B2 [ 1 + a2(1-k) + a3(1-k)2]
    dmax = a4 k wimp B4 [1+a5(1-k) + a6(1-k)2] / E t3

    Where resistance to uplift at corners is provided, the above formula will be conservative. Higher values may be obtained by assuming encastré status as outlined below.

    For plates encastré on all four edges

    The plate must be secured to prevent uplift, which would otherwise occur at the plate corners.

    w = a7 py t2 / k B2 [ 1 + a8(1-k) + a9(1-k)2]
    dmax = a10 k wimp B4 [1+a11(1-k) + a12(1-k)2] / E t3

    Where:

    L = length of plate (mm) (L > B)
    B = breadth of plate (mm)
    t = thickness of the plate on plain (mm)
    k = L4/(L4+ B4)
    py = design strength of plate ( 275 N/mm2 or 355 N/mm2)
    E = Young's modulus (205 x 103 N/mm2)
    1/m = Poisson's ratio (m = 3.0)
    gdead = load factor for dead load (1.4)
    gimp = load factor for imposed load (1.6)
    dmax = maximum deflection (mm) at serviceability due to imposed loads only
    w = uniformly distributed load on plate (ultimate) (N/mm2)
    wdead = uniformly distributed self weight of plate (N/mm2)
    wimp = uniformly distributed imposed load on plate (N/mm2)
    a1 to a12 are constants as below:

    ConstantValue
    a1 = 4/3
    a2 = 14/75
    a3 = 20/57
    a4 = (5m2 -5)/32m2
    a5 = 37/175
    a6 = 79/201
    a7 = 2
    a8 = 11/35
    a9 = 79/141
    a10 = (m2 -1)/32m2
    a11 = 47/210
    a12

    = 200/517

     

    Durbar ultimate load capacity –various sized plates

    Fixed on all four sides (encastré)

    The ultimate uniformly distributed load for various sizes of Durbar plates fixed on all four sides and stressed to 275N/mm2 can be determined by using the table. The values are based upon equations developed by C.C. Pounder and conform to the construction and fixing requirements in BS 4592-5 : 2006.  The values in the tables are theoretical; in-use performance may vary. This information should not be used without the advice of a qualified structural engineer. Users of this information should satisfy themselves that it is suitable for their purpose.

    Ultimate load capacity (kN/m2) for Durbar fixed on all four sides and stressed to 275N/mm2 

    Values obtained with plates secured to prevent uplift

    Thickness (t) Ultimate distributed load (kN/m2) for length, L, (mm)
    (mm)Breadth, B, (mm)60080010001200114001160011800120001
    4.5 600  47.7 36.8 33.5  32.2  31.6  31.4  31.2  31.1 
      800    26.8 21.5  19.5  18.6  18.1  17.9  17.7 
      1000      17.2 14.2  12.9  12.2  11.8  11.6 
      1200        6.42 5.3 2 4.82 4.42 4.32
      1400          4.12 3.42 3.12 2.92
    6 600  84.8 65.4  59.5  57.3  56.2  55.7  55.5  55.3 
      800    47.7 38.3  34.7  33.1  32.2  31.7  31.5 
      1000      30.5 25.3  22.9  21.7  21.0  20.6 
      1200        21.2 18 16.3  15.4  14.9 
      1400          15.6 13.4  12.3  6.82 
    8 600  150.8 116.2 105.9 101.8 100 99.1 98.6 98.3 
      800    84.8 68.1  61.7  58.8  57.3  56.4  56.0 
      1000      54.3 44.9  40.7  38.6  37.4  36.7 
      1200        37.7 31.9  29.0  27.4  26.5 
      1400          27.7 23.9  21.8  20.6 
    10 600  235.5 181.5  165.4  159.1  156.2  154.8  154.1  153.6 
      800    132.5 106.4  96.4  91.8  89.5  88.2  87.4 
      1000      84.8 70.2  63.7  60.3  58.4  57.3 
      1200        58.9 49.9  45.4  42.9  41.3 
      1400         43.3 37.3  34.1  32.2 
    12.5 600  368.0 283.6  258.4  248.6  244.1  241.9  240.7  240.0 
      800    207.0 166.2  150.7  143.5  139.8  137.8  136.6 
      1000      132.5 109.7  99.5  94.2  91.2  89.5 
      1200        92.0 77.9  70.9  67.0  64.6 
      1400          67.6 58.3  53.3  50.3 

    1. Stiffeners should be considered for spans in excess of 1100mm to avoid excessive deflections.
    2. Deflection values to B/100 at serviceability, assuming that the only dead load present is due to self-weight.

     

     

    back to top

    Overview

    Overview

    Applications

    Bridges
    Cladding and protective barriers
    Commercial vehicles
    Containers
    Lifts
    Offshore installations
    Shipbuilding
    Stairs and walkways
    Steps and safety platforms


    Limitation of use statement

    EN10025-1:2004 CE Approved Factory Production Control Certificate
    0038/CPD/20060004/A (Limitations of Use “Floor Plate Applications”)


    Relationship with standards

    Durbar meets the mechanical and chemical properties of EN 10025-2: 2004
    and is available in grades S235JR+AR, S275JR+AR and S355JR+AR.


    Load span data

    Members of The Steel Construction Institute can view load span data for Durbar at www.steelbiz.org, in table C242, floor plates simply supported, from the Steel Designers Manual, 6th Edition, 2003.

     

     

    back to top

    Properties

    Properties

    Mechanical properties

    The mechanical properties of Durbar® comply with EN 10025-2: 2004 and are shown in the table below. The values shown for strength and elongation are for test pieces taken transverse to the rolling direction; those for the impact test are for test pieces taken in the rolling direction.

    Grade

    Min. yield strength 1

    ReL

    Tensile strength
    Rm

    Min. elongation after fracture A

    Impact test

     

    N/mm2

    N/mm2

    %

     

     

     

     

    L0 = 5.65√S0

    Temp. °C

    Min. energy J

     

     

     

    3 ≤ t ≤ 12.5

     

     

    S235JR+AR

    235

    360 - 510

    24

    20

    27

    S275JR+AR

    275

    410 - 560

    21

    20

    27

    S355JR+AR

    355

    470 - 630

    20

    20

    27

    1. Lower yield strength or 0.2% proof stress applies.
    t - material thickness in mm.

     

    Chemical composition

    The chemical composition of Durbar® complies with EN 10025-2: 2004 and is shown in the table below.

    Grade

    C

    Mn

    P

    S

    Si

    N

     

    Max.

    Max.

    Max.

    Max.

    Max.

    Max.

    S235JR+AR

    0.17

    1.40

    0.035

    0.035

    -

    0.012

    S275JR+AR

    0.21

    1.50

    0.035

    0.035

    0.012

    S355JR+AR

    0.24

    1.60

    0.035

    0.035

    0.55

    0.012

    All values in weight%.

     

     

    back to top

    Dimensions

    Dimensions

     

    Dimensions in mm.

    Thickness

    Standard width

     

     

     

    S235JR+AR

    S275JR+AR

    S355JR+AR

    3.00

    1250

    1250

    1250

    4.50

    1500

    1500

    1500

    6.00

    1500

    1500

    -

    8.00

    1500

    1500

    -

    10.00

    1500

    1500

    -

    12.50

    1500

    1500

    -

    Widths of 1000mm (minimum), 1750mm and 1830mm are also available –
    please contact us.
    Please also contact us for details for any other non-standard dimensions.

     

    Tolerances

    Tolerances for wide strip and slit wide strip comply with standard EN 10051: 2010 (click here).

    Tighter tolerances are available, please contact us.

     

    back to top

    Design

    Design

     

    Using Durbar®

    Durbar is a non-slip raised pattern floor plate of integral manufacture (the pattern is rolled in not welded). The "tear drop" studs are distributed to give maximum slip resistance in a variety of applications whilst ensuring a free draining surface.

    The nominal gauge of Durbar is the thickness of the plain plate exclusive of pattern.

    Weight per Unit Area

    Thickness on plainMass
    (mm)(kg/m)
    3 27
    4.5 39
    6 50
    8 66
    10 82

    12.5

    101

    Capacity Tables

    It is usual to consider floor plates as supported on all four edges although stiffeners or joint covers may only support two edges. If the plates are securely bolted or welded to the supporting system, they may be considered as encastré. This increases the load carrying capacity slightly but reduces the deflection considerably.

    The thickness given is exclusive of any raised pattern i.e. on plain.
    The breadth is the smaller dimension and the length the greater, irrespective of the position of the main support members.
    The maximum uniformly distributed load on the plate (w) is given by Pounder's formula and the maximum skin stress is limited to the design strength py

    For calculating the maximum deflection (dmax) at serviceability, the uniformly distributed imposed load (wimp) on the plate is derived as follows.

    w = gdead wdead + gimp wimp
    wimp = (w - gdead wdead)/ gimp

    For plates simply supported on all four edges

    This formula assumes that there is no resistance to uplift at plate corners.

    w = a1 py t2 / k B2 [ 1 + a2(1-k) + a3(1-k)2]
    dmax = a4 k wimp B4 [1+a5(1-k) + a6(1-k)2] / E t3

    Where resistance to uplift at corners is provided, the above formula will be conservative. Higher values may be obtained by assuming encastré status as outlined below.

    For plates encastré on all four edges

    The plate must be secured to prevent uplift, which would otherwise occur at the plate corners.

    w = a7 py t2 / k B2 [ 1 + a8(1-k) + a9(1-k)2]
    dmax = a10 k wimp B4 [1+a11(1-k) + a12(1-k)2] / E t3

    Where:

    L = length of plate (mm) (L > B)
    B = breadth of plate (mm)
    t = thickness of the plate on plain (mm)
    k = L4/(L4+ B4)
    py = design strength of plate ( 275 N/mm2 or 355 N/mm2)
    E = Young's modulus (205 x 103 N/mm2)
    1/m = Poisson's ratio (m = 3.0)
    gdead = load factor for dead load (1.4)
    gimp = load factor for imposed load (1.6)
    dmax = maximum deflection (mm) at serviceability due to imposed loads only
    w = uniformly distributed load on plate (ultimate) (N/mm2)
    wdead = uniformly distributed self weight of plate (N/mm2)
    wimp = uniformly distributed imposed load on plate (N/mm2)
    a1 to a12 are constants as below:

    ConstantValue
    a1 = 4/3
    a2 = 14/75
    a3 = 20/57
    a4 = (5m2 -5)/32m2
    a5 = 37/175
    a6 = 79/201
    a7 = 2
    a8 = 11/35
    a9 = 79/141
    a10 = (m2 -1)/32m2
    a11 = 47/210
    a12

    = 200/517

     

    Durbar ultimate load capacity –various sized plates

    Fixed on all four sides (encastré)

    The ultimate uniformly distributed load for various sizes of Durbar plates fixed on all four sides and stressed to 275N/mm2 can be determined by using the table. The values are based upon equations developed by C.C. Pounder and conform to the construction and fixing requirements in BS 4592-5 : 2006.  The values in the tables are theoretical; in-use performance may vary. This information should not be used without the advice of a qualified structural engineer. Users of this information should satisfy themselves that it is suitable for their purpose.

    Ultimate load capacity (kN/m2) for Durbar fixed on all four sides and stressed to 275N/mm2 

    Values obtained with plates secured to prevent uplift

    Thickness (t) Ultimate distributed load (kN/m2) for length, L, (mm)
    (mm)Breadth, B, (mm)60080010001200114001160011800120001
    4.5 600  47.7 36.8 33.5  32.2  31.6  31.4  31.2  31.1 
      800    26.8 21.5  19.5  18.6  18.1  17.9  17.7 
      1000      17.2 14.2  12.9  12.2  11.8  11.6 
      1200        6.42 5.3 2 4.82 4.42 4.32
      1400          4.12 3.42 3.12 2.92
    6 600  84.8 65.4  59.5  57.3  56.2  55.7  55.5  55.3 
      800    47.7 38.3  34.7  33.1  32.2  31.7  31.5 
      1000      30.5 25.3  22.9  21.7  21.0  20.6 
      1200        21.2 18 16.3  15.4  14.9 
      1400          15.6 13.4  12.3  6.82 
    8 600  150.8 116.2 105.9 101.8 100 99.1 98.6 98.3 
      800    84.8 68.1  61.7  58.8  57.3  56.4  56.0 
      1000      54.3 44.9  40.7  38.6  37.4  36.7 
      1200        37.7 31.9  29.0  27.4  26.5 
      1400          27.7 23.9  21.8  20.6 
    10 600  235.5 181.5  165.4  159.1  156.2  154.8  154.1  153.6 
      800    132.5 106.4  96.4  91.8  89.5  88.2  87.4 
      1000      84.8 70.2  63.7  60.3  58.4  57.3 
      1200        58.9 49.9  45.4  42.9  41.3 
      1400         43.3 37.3  34.1  32.2 
    12.5 600  368.0 283.6  258.4  248.6  244.1  241.9  240.7  240.0 
      800    207.0 166.2  150.7  143.5  139.8  137.8  136.6 
      1000      132.5 109.7  99.5  94.2  91.2  89.5 
      1200        92.0 77.9  70.9  67.0  64.6 
      1400          67.6 58.3  53.3  50.3 

    1. Stiffeners should be considered for spans in excess of 1100mm to avoid excessive deflections.
    2. Deflection values to B/100 at serviceability, assuming that the only dead load present is due to self-weight.

     

     

    back to top