Post on 04-Jun-2018
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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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