# Civil Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 4 (Q.No. 32)
32.
In a continuous bending moment curve the point where it changes sign, is called
point of inflexion
point of contraflexture
point of virtual hinge
all the above.
Explanation:
No answer description is available. Let's discuss.
Discussion:
8 comments Page 1 of 1.

Vardhan said:   7 years ago
Yes, B is correct.
(1)

Ayesha said:   5 years ago
Where BM changes its sign from +ve to -ve or -ve to +ve is called point of contraflexure and where deflection curve changes its nature from convex to concave or concave to convex is called point of inflection.
What about point of virtual hinge? Can anybody explain?
(1)

Kaku said:   3 years ago
(1)

Deb said:   7 years ago
I think it should be only B.

Indu said:   7 years ago
Point of inflexion means where the shear force changes its sign, the point of a virtual hinge is about virtual work, the point of contra flexure means. Where the bending moment changes its sign. So, option B is correct.

Kalyani said:   7 years ago
Yes, B is correct.

Joydeep said:   6 years ago
@Indu.

Point of inflexion means, that point where BM is 0 ( either BM changed sign or not )
In simply supported beam, always BM is 0 at support, this point is called a point of inflexion, & where BM changed sign only this point is called a point of contra flexture.

We say that every point of contra flexure is the point of inflexion, but all point of inflexion does not point of contra flexure.

Jinish said:   5 years ago
Point of inflexion means:where BM change sign or concave to convex or point of the curve were downward to upward moment of curve and vice versa.

Point of contra flexure: where BM is zero where bending moment curve intersects zero bending moment line.

Point of virtual hinge: in continues beam, we have to provide construction etc type so it's an original joint together at the point where one can swing relative to the other.