5 Str Fasteners - Students

7/31/2019 5 Str Fasteners - Students

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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 linesminimum 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 strengthand shear strength of rivet

2(i) Bearing strength of rivet

2(ii) Shearing strength of rivet

tdpat )(

td

td

p

pf

..

..

4

.2d

vf

4

.22d

vf SS DS


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Rivet/Bolt : stress constraints

at

pf

vf

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

= 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 adouble-riveted butt joint with unequal cover plates 6mm thick asshown in Figure. Determine the strength of the joint per pitchand 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 rivetsof 22 mm diameter arranged in twovertical rows 10 cm apart. The pitchof the rivets is 8cm and the loadlies in the plane of the rivets.Calculate the maximum stress in the

rivets.


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43. Determine themaximum load inthe rivets of the

eccentric connection

shown in Figure .


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45. A 16 mm thick plates is joined by doublecover butt joint using a 10mm thick coverplate. Permissible tensile strength as per

structural steel IS : 226-1975 is 150MPa. Determine the strength andefficiency of the joint for pitch of 9cm,

with 20mm bolts (property of class 8.8bolt: proof load =147 kN)


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WELDS- STRUCTURAL JOINT


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WELD: TYPES


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46. Design a butt weld toconnect a 12 mm thickbracket plate to theflange of a column. Thebracket is to transmit

a load of 100 kN at aneccentricity of 15 cm asshown in Figure


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47. Determine the sizeof the fillet weld

required to join abracket plate with

flange of a column asshown in Figure.


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48. An eccentric weldconnection is shown inFigure has 6 mm filletweld. Determine thegreatest load P perbracket plate which can

be applied on theconnection if theshear stress in the weld isnot to exceed 108 MPa.


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Structural fasteners49. A circular rod 50 mm in diameter

and 200 mm is welded to plate byfillet welding all round thecircumference as shown in Figure.The weld size is 15 mm. Thesection modulus of the weld is22000mm3. Determine the resultant

stress in the weld.


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50. Design a suitable fillet weldto connect a tie bar 60x8 mm toa 12 mm thick gusset plate as

shown in Figure. The permissiblestresses in the tie bar and filletweld are 150 MPa and 108 MParespectively.



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5 Str Fasteners - Students

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