Fastener Students

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    FAILURE OF RIVETS

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    Rivets: Design guide lines

    Nominal diameter

    (mm)

    12 16 20 24

    Gross diameter

    (mm)

    13.5 17.5 21.5 25.5

    Minimum edge

    distance (mm)

    19 29 32 44

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    Rivets: Design guide lines

    minimum diameter of rivet

    Thickness of member minimum diameter (mm)

    Up to 10 mm 16 mm

    10-16 mm 20 mm

    >16 mm 22 mm

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    Strength of rivet

    (Least of the ..)1. Strength of plate between

    Rivet holes in tension

    2. Rivet value smaller of bearing strength

    and shear strength of rivet2(i) Bearing strength of rivet

    2(ii) Shearing strength of rivet

    tdpat )(

    td

    td

    p

    pf

    ..

    ..

    4.

    2d

    vf

    4.2

    2d

    vf SS DS

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    Rivet/Bolt : stress constraints

    at

    = Allowable tensile stress in axially loaded tension member (1)

    pf

    vf

    = Allowable bearing strength in member (4)

    = Allowable bearing strength in rivet (3)

    p

    = Allowable shear strength (least of single shear and double

    shear) of rivet (2)

    Stress(MPa) 1 2 3 4rivet 100 100 300 300

    bolt 120 80 250 250

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    Minimum size of fillet weld

    Thickness of member minimum size

    Up to 10 mm 3 mm

    10-20 mm 5 mm

    20-32 mm 6 mm

    32-50 mm 8 mm first run

    10 mm minimum

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    Welded connection : in plane

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    Structural fasteners

    41. A boiler shell of diameter is made of 10 mm thick plates. The joint is a

    double-riveted butt joint with unequal cover plates 6mm thick as

    shown in Figure. Determine the strength of the joint per pitch

    and its efficiency. The permissible stresses are at=150 MPa, pf =250MPa,

    and vf=80 MPa.

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    Structural fasteners

    42. A bracket shown in Figure ransmitsa load of 80 kN at an eccentricity of

    30 cm to a column through 10 rivets

    of 22 mm diameter arranged in two

    vertical rows 10 cm apart. The pitch

    of the rivets is 8cm and the load

    lies in the plane of the rivets.

    Calculate the maximum stress in the

    rivets.

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    Structural fasteners

    43. Determine themaximum load in

    the rivets of theeccentric connection

    shown in Figure .

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    WELDS- STRUCTURAL JOINT

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    Structural fasteners

    46. Design a butt weld toconnect a 12 mm thick

    bracket plate to theflange of a column. Thebracket is to transmita load of 100 kN at an

    eccentricity of 15 cm asshown in Figure

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    Structural fasteners47. Determine the size

    of the fillet weld

    required to join abracket plate with

    flange of a column as

    shown in Figure.

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    Structural fasteners

    48. An eccentric weldconnection is shown inFigure has 6 mm fillet

    weld. Determine thegreatest load P perbracket plate which can

    be applied on the

    connection if theshear stress in the weld isnot to exceed 108 MPa.

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    Structural fasteners

    50. Design a suitable fillet weld

    to connect a tie bar 60x8 mm to

    a 12 mm thick gusset plate as

    shown in Figure. The permissiblestresses in the tie bar and fillet

    weld are 150 MPa and 108 MPa

    respectively.

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