Structural Fasteners Civil Engineering (CE) Notes | EduRev

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The document Structural Fasteners Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Topic wise GATE Past Year Papers for Civil Engineering.
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Q.1 A 16 mm thick gusset plate is connected to the 12 mm thick flange plate of an l-section using fillet welds on both sides as shown in figure (not drawn to scale). The gusset plate is subjected to point of 350 kN acting at a distance of 100 mm from the flange plate. Size of fillet weld is 10 mm.
Structural Fasteners Civil Engineering (CE) Notes | EduRev
The maximum resultant stress (in MPa, round off to 1 decimal place) on the fillet weld along the vertical plane would be_______.    [2019 : 2 Marks, Set-I]
Solution:

Structural Fasteners Civil Engineering (CE) Notes | EduRev
P = 150 kN, e = 100 mm
tt = Effective throat thickness
tt = 0.7S
S = Size of weld = 10 mm
∴ tt = 0.7 x 10 = 7 mm
Shear stress due to direct force,
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Normal stress due to bending,
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Resultant stress,
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.2 Four bolts P, Q, R and S of equal diameter are used for a bracket subjected to a load of 130 kN as shown in the figure.
Structural Fasteners Civil Engineering (CE) Notes | EduRev
The force in bolt P is    [2018 : 2 Marks, Set-II]
(a) 32.50 kN
(b) 69.32 kN
(c) 82.50 kN
(d) 119.32 kN
Ans.
(B)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.3  A fillet weld is simultaneously subjected to factored normal and shear stresses of 120 MPa and 50 MPa, respectively. As per IS 800 : 2007, the equivalent stress (in MPa. up to two decimal places) is _____.    [2018 : 1 Mark, Set-II]
Solution:

Factored normal stress, fa = 120 MPa
Factored shear stress, q = 50 MPa
According to IS-800 : 2007, clause 10.5.10.1.1 The equivalent stress,
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
So, equivalent stress 147.99 MPa.

Q.4  In a fillet weld, the direct shear stress and bending tensile stress are 50 MPa and 150 MPa, respectively. As per IS 800: 2007, the equivalent stress (in MPa, up to two decimal places) will be _____.    [2018 : 1 Mark, Set-I)
Solution:

Direct bending tensile stress,
fa = 150 MPa
Direct shear stress,
q = 50 MPa
According to IS 800: 2007, clause 10.5.10.1.1
The equivalent stress,
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
So, equivalent stress of 173.21 MPa.

Q.5 Two plates of 8 mm thickness each are connected by a fillet weld of 6 mm thickness as shown in the figure.
Structural Fasteners Civil Engineering (CE) Notes | EduRev
The permissible stresses in the plate and the weld are 150 MPa and 110 MPa, respectively. Assuming the length of the weld shown in the figure to be the effective length, the permissible load P (in kN) is ____________ .    [2017 : 2 Marks, Set-II]
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
= 110 (100 + 100 + 50) x 0.7 x 6
= 115.5 kN
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.6 A column is subjected to a load through a bracket as shown in the figure
Structural Fasteners Civil Engineering (CE) Notes | EduRev
The resultant force (in kN, up to one decimal place) in the bolt 1 is _________ .    [2017 : 2 Marks, Set-I]
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.7 Two bolted plates under tension with alternative arrangement of bolt holes are shown in figures 1 and 2. The hole diameter, pitch, and gauge length are d, p and g, respectively
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Which one of the following conditions must be ensured to have higher net tensile capacity of configuration shown in figure 2 than that shown in figure 1?    [2016 : 2 Marks, Set-Il]
(a) p2 > 2gd
(b) p2 < Structural Fasteners Civil Engineering (CE) Notes | EduRev
(c) p2 > 4gd
(d) p > 4gd
Ans.
(C)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Tensile strength of plate in arrangement (2) will be greater than in arrangement (1),
* As per IS code 800:2007 close 6.3
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.8 Two plates are connected by fillet welds of size 10 mm and subjected to tension, as shown in the figure. The thickness of each plate is 12 mm. The yield stress and the ultimate tensile stress of steel are 250 MPa and 410 MPa, respectively. The welding is done in the workshop Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
As per the Limit State Method of IS 800 : 2007, the minimum length (rounded off to the nearest higher multiple of 5 mm) of each weld to transmit a force P equal to 270 kN (factored) is    [2016 : 2 Marks, Set-T]
(a) 90 mm
(b) 105 mm
(c) 110 mm
(d) 115 mm
Ans. 
(B)
Solution:
Maximum force carried by plates,
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Strength of weld = Load carried by weld
Structural Fasteners Civil Engineering (CE) Notes | EduRev
= 105 mm (rounded off to nearest higher multiple of 5 mm)

Q.9 A bracket plate connected to a column flange transmits a load of 100 kN as shown in the following figure. The maximum force for which the bolts should be designed i s ________ kN.    [2015 : 2 Marks, Set-I]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.10 The tension and shear force (both in kN) in each bolt of the joint, as shown below, respectively are    [2014 : 2 Marks, Set-I]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
(a) 30.33 and 20.00
(b) 30.33 and 25.00
(c) 33.33 and 20.00
(d) 33.33 and 25.00
Ans. 
(D)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Shear in each bolt = Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.11 Two plates are connected by fillet welds of size 10 mm and subjected to tension, as shown in the sketch. The thickness of each plate is 12 mm. The yield stress and the ultimate tensile stress of steel are 250 MP and 410 MPa respectively. The welding is done in the workshop (λmm = 1.25). As per the Limit State Method of IS 800:2007, the minimum length (rounded off to the nearest higher multiple of 5 mm) of each weld to transmit a force P equal to   [2012 : 2 Marks]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
(a) 100 mm
(b) 105 mm
(c) 110 mm
(d) 115 mm
Ans.
(B)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Maximum force transmitted by plate = P
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Force resisted by weld,
P= 272.72 kN ...(i)
Let length of weld on either side = l
Size of weld (S) = 10 mm
force resisted by weld = Structural Fasteners Civil Engineering (CE) Notes | EduRev
Size= 10 mm
Throat thickness = 0.7 x 10 = 7 mm
Structural Fasteners Civil Engineering (CE) Notes | EduRev ...(ii)
From equations (i) and (ii),
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.12 In a steel plate with bolted connection, the rupture of the net section is a mode of failure under    [2012 : 1 Mark]
(a) tension
(b) compression
(c) flexure
(d) shear
Ans.
(A)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.13 For the fillet weld of size ‘s’ shown in the adjoining figure the effective throat thickness is    [2011 : 1 Mark]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
(a) 0.61s
(b) 0.65s
(c) 0.70s
(d) 0.75s
Ans. 
(B)
Solution:
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Effective throat thickness is the shortest distance from the root of fillet weld to the face of the line joining the toes. The effective throat thickness should not be less than 3 mm.
Effective throat thickness = Ks.
where s is the size of weld in mm and K is a constant. The value of K depends upon the angle between the fusion faces.
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.14 wo plates, subjected to direct tension, each of 10 mm thickness and having widths of 100 mm and 175 mm, respectively are to be fillet welded with an overlap of 200 mm. Given that the permissible weld stress is 110 MPa and the permissible stress in steel is 150 MPa, the length of the weld required using the maximum permissible weld size as per IS 800: 1984 is    [2010 : 2 Marks]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
(a) 245. 3 mm
(b) 229.2 mm
(c) 205.5 mm
(d) 194.8 mm
Ans. 
(B)
Solution:
The maximum size of a fillet weld is obtained by subtracting 1.5 mm from the thickness of the thinner member to be jointed.
∴ S = 10 - 1.5 = 8.5 mm
Strength of the thinner plate
= 100 x 10 x 150 x 10-3 = 150 kN
Strength of the weld
Structural Fasteners Civil Engineering (CE) Notes | EduRev

Q.15  A double cover butt riveted joint is used to connect two flat plates of 200 mm width and 14 mm thickness as shown in the figure. There are twelve power driven rivets of 20 mm diameter at a pitch of 50 mm in both directions on either side of the plate. Two cover plates of 10 mm thickness are used. The capacity of the joint in tension considering bearing and shear ONLY, with permissible bearing and shear stresses as 300 MPa and 100 MPa respectively is    [2010 : 2 Marks]
Structural Fasteners Civil Engineering (CE) Notes | EduRev
(a) 1083.6 kN
(b) 871.32 kN
(c) 541.8 kN
(d) 433.7 kN
Ans. 
(B)
Solution:
Strength of one rivet in double shear
Structural Fasteners Civil Engineering (CE) Notes | EduRev
Strength of the riveted joint in double shear
= 12 x 72.61 = 871.32 kN
Strength of one rivet in bearing Structural Fasteners Civil Engineering (CE) Notes | EduRev
= (20 + 1.5) x 14 x 300 x 10-3 = 90.3 kN
Strength of the riveted joint in bearing
= 12 x 90.3 = 1083.6 kN
Thus the strength of joint will be governed by shearing and it will be equal to 871.32 kN

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