Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 12)
12.
A beam of length L is pinned at both ends and is subjected to a concentrated bending couple of moment M at its centre. The maximum bending moment in the beam is
Discussion:
56 comments Page 1 of 6.
Sanjeev Ranjan said:
9 years ago
The answer is M because pinned support don't carry any moment i.e. zero moments (Decreasing moment towards the either support in this case) and here is clear that couple M is applied at midspan so center carries maximum bending moment.
Narob Kifle said:
9 years ago
Max moment occurs at center. So. Take the sum of the moment.
At A is zero, By * L = M,
So the sum of vertical force = 0, By + Ay = 0.
We got Ay = -M/L. So, M/2 is the correct answer.
At A is zero, By * L = M,
So the sum of vertical force = 0, By + Ay = 0.
We got Ay = -M/L. So, M/2 is the correct answer.
Suraj said:
9 years ago
Maximum moment in this case will be M but maximum bending moment will be M/2.
As bending moment at a section is sum of the moments either to the left or right of the section.
As bending moment at a section is sum of the moments either to the left or right of the section.
Patil said:
9 years ago
Answer is M.
Couple is due to two equal forces in different direction so its does not depend on other parameters, i.e couple will be same for entire length.
Couple is due to two equal forces in different direction so its does not depend on other parameters, i.e couple will be same for entire length.
Sumit said:
1 decade ago
Sum of moment about A is = to zero.
M = Rb*L.
Rb = M/L and Ra = (-M/L).
Take moment @ A from Rb, (M/L*L) = M.
M = Rb*L.
Rb = M/L and Ra = (-M/L).
Take moment @ A from Rb, (M/L*L) = M.
Dungarani Nirav said:
1 decade ago
Pinned joint can not be bend or there will be no moment can produce at pin joint so total moment is equal to M.
Prasad said:
9 years ago
It is m. Because at centre, the moment will be m/2 that means its half of moment. Max is m. So the answer is m.
Subhankar said:
9 years ago
It is M/2 because Rb = M/L& Ra = -M/L. Moment from mid point = RbxL/2 = M/LxL/2 = M/2 and M/2 - M = -M/2.
Ravi Kumar pudi said:
7 years ago
By its BMD. I think it is uniform rectangle. i.e, BM along the total span will be the same. So, max BM is M.
Ankush said:
7 years ago
Ra+RB = M.
And takin moment about A,then;
Total length is L, the acting at centre.
So, max.bm is ml/2.
And takin moment about A,then;
Total length is L, the acting at centre.
So, max.bm is ml/2.
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