Question

A simply supported beam ab of span l carries two concentrated loads w each at points l/3 from a and b. The shear force in the middle one third portion of the beam is

Answer 1

Answer:Zero

Explanation:

Answer 2

The sheer force in the middle one-third portion of the beam is zero.

Given:

A simply supported beam ab of span l carries two concentrated loads w each at points l/3 from a and b.

To Find:

How much shear force is in the middle one-third portion of the beam.

Solution:

The beam is loaded symmetrically, and there will be an equal reaction from a and b.

We know, that the direction of a shear force is always parallel to a surface or cross-section of a body.

It gives equal and opposite forces on two different parts of the body.

According to the diagram given,

the mid l/3 will get a shear force of (W-W) i.e, zero force from both the right and left sides.

Thus the middle one-third portion will carry zero shear force.

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