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1
Dr.
Ali
Al-G
adhi
b
Lecture No. 21Lecture No. 21
To be able to find Shear Flow and
Shear Stress at glue and at nails.
Ib
VQ
I
VQq
2
Dr.
Ali
Al-G
adhi
b
• Shear Flow at a Particular Junction
3
Dr.
Ali
Al-G
adhi
b
The beam is constructed from four boards glued together. If it is subjected to a shear of V = 850 kN, determine the shear flow at B and C that must be resisted by the glue.
4
Dr.
Ali
Al-G
adhi
b
m01.0m250.0m01.0m125.0m01.0m3.02
m01.0m250.0m305.0m01.0m125.0m205.0m01.0m3.0m15.02
A
Ayy
Section Properties.
5
Dr.
Ali
Al-G
adhi
b
Shear Flow.
Ans.... m/MN0498.0q and m/MN31.1q
m/MN0995.0m1052.87
m1001025.0kN850
I
VQq
m/MN62.2m1052.87
m10270.0kN850
I
VQq
CB
46
33C
C
46
33B
B
6
Dr.
Ali
Al-G
adhi
b
A box beam is to be constructed from four boards nailed together. If each nail can support a shear force of 30 N, determine the maximum spacing s of nails at B and at C so that the beam will support the vertical force of 80 N.
7
Dr.
Ali
Al-G
adhi
b
Internal Shear.
8
Dr.
Ali
Al-G
adhi
b
Shear Flow.
Ans..
Ans..
9
Dr.
Ali
Al-G
adhi
b
Nails having a total shear strength of 40 N are used in a beam that can be constructed either as in Case I or as in Case II, If the nails are spaced at 9 cm, determine the largest vertical shear that can be supported in each case so that the fasteners will not fail.
10
Dr.
Ali
Al-G
adhi
b
11
Dr.
Ali
Al-G
adhi
b
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