Beam Bending Moment Types Explained
A bending moment represents the internal effect of external forces causing a beam to bend. The type of bending moment determines the direction and shape of this curvature.
Understanding Beam Curvature
Beams bend under load. The shape of this bending is crucial in structural analysis. Two primary types of bending moments describe this curvature:
- Sagging Bending Moment: This moment causes the beam to curve downwards, forming a shape like a smile (concave upwards). Tension occurs at the bottom fiber and compression at the top fiber.
- Hogging Bending Moment: This moment causes the beam to curve upwards, forming a shape like a frown (convex upwards). Tension occurs at the top fiber and compression at the bottom fiber.
Identifying the Correct Bending Moment
The question asks for the specific type of bending moment that produces "convexity above the centre line". This visual description directly corresponds to the upward curvature characteristic of a hogging bending moment.
Therefore, the bending moment resulting in convexity above the centre line is the hogging bending moment.
Important Questions from Shear Force and Bending Moment
The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of:
The bending moment diagram of a simply supported beam carrying uniformly distributed load over the entire span is-
A simply supported beam is subjected to a linearly varying load from one end to other end. The nature of variation of shear force diagram is-
Which type of beam, freely supported at two points, has one or both ends extending beyond these supports?
Which of the following statements are correct?
