Civil Engineering - Theory of Structures - Discussion


The point of contraflexure is the point where

[A]. B.M. changes sign
[B]. B.M. is maximum
[C]. B.M. is minimum
[D]. S.F. is zero.

Answer: Option A


No answer description available for this question.

Divyanshu Sah said: (Mar 13, 2014)  
Point of contraflexure is where BM changes its sign i.e from +to- or -to+.

S.F is maximum at that point.

Cyruz said: (Dec 14, 2014)  
I was taught by my lecturer that the point of contraflexure is the point where the bending moment is zero. How true is that?

Mavish said: (Dec 18, 2014)  
At contraflexure S.F is max so ultimately B.M is zero. And at this point B.M changes its sign means 1st it will reach 0 then change in sign occur.

Deepak Pathak said: (Aug 6, 2015)  
Because if s.f=0. Maximum B.M will be their.

Emmanuel said: (Aug 29, 2015)  
Were sagging B.M changes to hogging. That is from positive to negative or can be said to be point of zero shear force.

Kamal said: (Oct 11, 2015)  
I think When SF change its sign at that point call a point of contraflexure. So at that time SF becomes zero and when SF becomes zero BM becomes maximum.

Kuldeep said: (Mar 4, 2016)  
The point of contraflexure is mid point of beam where are bending moment are zero.

Belal Hossain said: (Mar 17, 2016)  
The point of bending moment =0.

Mahesh said: (Jan 5, 2017)  
Point of contraflexure is the point at which bending moment changes sign not the point at which bending moment is zero.

E.g. for a cantilever carrying a point load at its free end. BM at the free end is zero but no sign change ocure so it is not a point of contraflexure.

Ashish Tadewar said: (Mar 15, 2017)  
Shear force changes its sign and BM is max at the point of contra flexure.

Snehasis Samanta said: (Apr 18, 2017)  
I think the correct answer is A.

Ms Ansari said: (Nov 13, 2017)  
When the load coming change. It's which udl to point load because create point of contraflexure.

Jeet said: (Mar 8, 2018)  
BM will be maximum when SF is zero, so I feel the correct option is B.

Munish said: (Mar 10, 2018)  
Bm will be zero is called point of contraflexure.

Ankit said: (May 14, 2018)  
Point of contrflexure is where sf changes it sign and there is maximum BM.

Tepal Siongh said: (Sep 24, 2018)  
Point of contraflexure is maximum when bending moment changes its change.

Santhosh Kumar said: (Jul 23, 2019)  
Point of contraflexure occurs where bending moment changes its sign from positive to negative or viceversa.

Momo said: (Sep 18, 2019)  
Correct @Santhosh.

Abinab Ranjan said: (Sep 27, 2019)  
Bending moment will be zero is called point of contraflexure.

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