Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 5 (Q.No. 13)
13.
A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
Discussion:
13 comments Page 1 of 2.
Inayat Ullah Kakar said:
6 months ago
By using the Critical neutral axis.
We know that
C/x = T/(h-x).
If:
C = compression = 1,
T = tension = 3,
1/x = 3/(h-x).
x = h/4.
Then the given answer is correct.
We know that
C/x = T/(h-x).
If:
C = compression = 1,
T = tension = 3,
1/x = 3/(h-x).
x = h/4.
Then the given answer is correct.
(2)
Sandya said:
5 years ago
Explain it.
Sandya said:
5 years ago
Explain with diagram?
Krishna said:
5 years ago
See here the beam is under hogging i.e. top fiber under tension and bottom fiber under compression. Therefore the answer given is correct.
If it is under sagging, It would be given as 3h/4 in the options along with h/4.
If it is under sagging, It would be given as 3h/4 in the options along with h/4.
Giraq said:
6 years ago
From top x=3/4h.
From bottom x=1/4h.
From bottom x=1/4h.
(1)
Srikanth said:
6 years ago
1/x = 3/(h-x).
x = h/4.
x = h/4.
(2)
Nilraj said:
6 years ago
Answer is correct. Because C.G. is moving towards more area and towards flange area is more.
Sanju said:
7 years ago
Thanks @Naveen.
Naveen Kallan said:
7 years ago
3/x = 1/h-x
X= 3h/4 from top.
X= 3h/4 from top.
T. Suresh Babu said:
8 years ago
Yes, (3h/4) is correct when the applied moment is Sagging. Otherwise i.e., if the applied moment is Hogging it is (h/4). As in the options both are not given means we have to take the moment is Hog. If both are given there will be an ambiguity. So, in that case the type of moment have to given in the question.
(1)
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