Civil Engineering - Strength of Materials - Discussion


The force in member U2L2 of the truss shown in below figure, is

[A]. 10 T tension
[B]. 10 T compression
[C]. zero
[D]. 15 T compression.

Answer: Option B


No answer description available for this question.

Raghu said: (Mar 13, 2015)  
Force acting towards the joint in a tress will exert compressive force.

Dhawal Kalra said: (Jul 8, 2015)  
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.

Denzil said: (Dec 2, 2016)  
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.

Pawan Joshi said: (Mar 19, 2017)  
It's 5T compression by the method of section.

Roop Kumar said: (May 26, 2017)  
You are exactly correct @Pawan Joshi.

Mahesh said: (Jul 13, 2017)  
Can anyone give a correct explanation?

Ramya said: (Jul 17, 2017)  
Give the correct explanation, please.

Ebeyehu said: (Aug 21, 2017)  
As my perception the answer will be 20t tension.

Kallan said: (Oct 11, 2017)  
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.

Shees said: (Jan 10, 2018)  
Yes, it is 5T compression.

Koirala said: (Feb 28, 2018)  
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.

Roop Kumar said: (Mar 2, 2018)  
Yes, it is 5T compression.

Muhammad Zeeshan Khan said: (Mar 14, 2018)  
Yes, it is 5 T compression by the method of joint.

Santu said: (May 8, 2020)  
10T Compression is the correct answer. I too agree.

Kiran said: (Sep 27, 2020)  
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.

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