Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 30)
30.
The force in member U2L2 of the truss shown in below figure, is
Discussion:
16 comments Page 1 of 2.
Kallan said:
8 years ago
Support reaction = 15 T.
Take a section passing through U1U2, U2L2, L2L3. And Consider right section.
Now within the section, vertical forces are 10 T at U2, Force of U2L2 at U2, 10 T at last end and 15 T from support. Assume force of U2L2 downward.
Now take summation V = 0.
10 + F + 10 -15 = 0.
F = - 5. -ve indicates assumption is wrong, it is acting upwards i.e. towards the joint. So it is compressive.
So, the answer is 5 T compression.
Take a section passing through U1U2, U2L2, L2L3. And Consider right section.
Now within the section, vertical forces are 10 T at U2, Force of U2L2 at U2, 10 T at last end and 15 T from support. Assume force of U2L2 downward.
Now take summation V = 0.
10 + F + 10 -15 = 0.
F = - 5. -ve indicates assumption is wrong, it is acting upwards i.e. towards the joint. So it is compressive.
So, the answer is 5 T compression.
Kiran said:
5 years ago
Answer is 15T because there is already 10T and resolved force is 5; reaction=15T, SF at U2= 10+10-15= 5T, resolved force 5T+ already in member 10T = 15T.
Denzil said:
9 years ago
As per my knowledge, It should be 5T compression. I evaluated it by using the method of joints working from a joint with the zero-force member.
Koirala said:
7 years ago
It can't be 10t because load is share by U2L3 component also. If the inclined portion joins L2U3 instead of U2L3 then it will be 10T.
DHAWAL KALRA said:
1 decade ago
Hey guys as truss members do not have any bending moment criteria. So in this question it can't be tensile as it will generate b.m.
Raghu said:
1 decade ago
Force acting towards the joint in a tress will exert compressive force.
Amit Shinde said:
2 years ago
@All.
The force in U2L2 is 5T which behaves as a compression member.
The force in U2L2 is 5T which behaves as a compression member.
Santu said:
5 years ago
10T Compression is the correct answer. I too agree.
Muhammad zeeshan khan said:
7 years ago
Yes, it is 5 T compression by the method of joint.
Ebeyehu said:
8 years ago
As my perception the answer will be 20t tension.
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