Which type of stress is established when a beam carries a concentrated load?

When a beam is subjected to a concentrated load, it experiences two types of stresses: bending stress and shear stress.

Bending stress occurs because the load creates a moment that causes the beam to deform, resulting in fiber elongation on one side and fiber compression on the other. The amount of bending stress within the beam varies, being greatest at the outermost fibers away from the neutral axis of the beam and reducing to zero at the neutral axis itself.

Shear stress arises because the beam must transfer the load from the point of application down through its length to the supports. This shear stress occurs across the cross-section of the beam and is highest near the points of load application.

In summary, when analyzing a beam under a concentrated load, both bending and shear stresses are significant to fully understand the behavior of the structure under load conditions. Therefore, the correct choice identifies both types of stresses as they are both essential in the structural analysis of beams.