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Week 3 Assignment 3 Solution Full Marks 20 1 (A) Four Times The Size of Weld

This document contains the solutions to 12 questions for a week 3 assignment. The solutions provide hints and references to lecture slides related to the design of butt welds, fillet welds, and eccentric connections. The key points covered include: 1) The effective length of a butt weld should be at least four times the weld size. 2) For incomplete butt weld penetration, the effective throat thickness is 7/8 of the thinner part thickness. 3) Butt weld size is specified by the effective throat thickness. 4) Formulas are provided to calculate weld strength and shear stress in a fillet weld connection. 5) Formulas are given for calculating

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amin alzuraiki
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356 views3 pages

Week 3 Assignment 3 Solution Full Marks 20 1 (A) Four Times The Size of Weld

This document contains the solutions to 12 questions for a week 3 assignment. The solutions provide hints and references to lecture slides related to the design of butt welds, fillet welds, and eccentric connections. The key points covered include: 1) The effective length of a butt weld should be at least four times the weld size. 2) For incomplete butt weld penetration, the effective throat thickness is 7/8 of the thinner part thickness. 3) Butt weld size is specified by the effective throat thickness. 4) Formulas are provided to calculate weld strength and shear stress in a fillet weld connection. 5) Formulas are given for calculating

Uploaded by

amin alzuraiki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Week 3 Assignment 3 Solution Full Marks 20

Q.1 The effective length of butt weld should not be less than 1
(a) four times the size of weld
Solution hints:
Lec 11 Design of Butt Welds, Slide No. 6.

Q.2 In case of incomplete penetration of butt weld the effective throat


thickness is taken as 1
(b) th
7/8 of the thickness of the thinner part.
Solution hints:
Lec 11 Design of Butt Welds, Slide No. 5

Q.3 The size of butt weld is specified by 1


(a) effective throat thickness
Solution Hints:
Lec 11 Design of Butt Welds, Slide No. 3.

Q.4 An ISMC 300 @ 0.363 kN/m is connected to a 12mm thick gusset


plate. The size of the weld is 6 mm. Assume site welding. The strength
of the weld is 2
(c) 663 N/mm
Solution Hints:
Throat thickness = 0.7×6 = 4.2 mm
Strength of weld per mm run = tefu/√3×1.5 =4.2×410/√3×1.5 = 663
N/mm

Q.5 A pipe of 100 mm diameter is connected to a plate with a fillet weld of


size 5 mm. A vertical force of 10 kN is acting at a distance 0.5 m from
welded end. Calculate shear stress due to direct load. 2
(c) 9 N/mm 2

Solution hints:
Effective throat thickness = 0.7×5 = 3.5 mm
𝑃
𝑞=
2𝜋𝑟𝑡

So, q = (10×103)/(2×π×50×3.5) = 9 N/mm2


Q.6 If moment (M) on the joint of eccentric connection is much high
compare to the direct load, the required number of bolts n in one row
in a bolt group with bolts having pitch p, number of rows nʹ and bolt
value Bsd, is given by 2

𝟔𝑴
(b) 𝒏=√
𝒑𝒏’𝑩𝒔𝒅
Solution hints:
See lecture 14 Design of eccentric connection, slide no 2.

Q.7 If moment (M) on the joint of eccentric connection is much less


compare to the direct load (P), the approximate number of bolts in a
bolt group with bolts having bolt value Bsd, is given by
𝑷
(c) 𝒏=
𝑩𝒔𝒅
Solution hints:
See lecture 14 Design of eccentric connection, slide no 2.Q.8
Which one of the following is the most critical bolt in the joint
shown in the figure given below?
2

300 kN

5 1
6 2
7 3
8 4

(b) Bolt 4
Solution hints:
In the case of inclined load, a bolt nearest to the load axis will be
critical. Extending the line of action of the load, the nearest bolt is bolt 4.
Q.9 Polar moment of inertia of weld, Ip is equal to 1
(c) Ix + Iy
Solution hints:
See lecture 15 Design of eccentric connection, slide no 4

Q.10 When the load line coincides with the centroid of the bolt group, the
bolts are subjected to 1
(a) shear only

Q.11 If P is the load lying in the plane of welded joint of an eccentric


connection with throat thickness t and total length of the weld is L, the
direct shear stress in the weld 1
(b) P/Lt
Solution hints:
See lecture 15 Design of eccentric connection, slide no 3
Q.12 A moment M of magnitude 50 kN-m is transmitted to a column flange
through a bracket by using four 20 mm diameter bolts as shown in the
figure:

The shear force induced in the bolt A is 5


(c) 214.4 kN
Solution hints:
The centroid of bolt will be on the symmetric lines and each bolt will
be at
𝑟 = √502 + 302 = 58.31 mm
Shear force in bolt A is given by
𝑀𝑟 50×103 ×58.31
𝐹𝑠 = ∑ 2 = = 214.4 kN
𝑟 4×58.312

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