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8/13/2019 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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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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43. Determine themaximum load in

the rivets of theeccentric connection

shown in Figure .


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WELDS- STRUCTURAL JOINT


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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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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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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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