👉The bending moment and shear force

💫They are two important concepts in structural engineering that describe how loads act on a beam or any structural element.

🚧Shear Force refers to the internal force that acts along a section of a beam and tends to cause one part of the beam to slide or shear over the adjacent part.

⏺It develops due to the vertical (or transverse) loads applied to the beam. In simple terms, it measures how much force is trying to cut the beam across its cross-section.

⏺When you move along the beam, the shear force changes wherever the load changes.
High shear force occurs near supports where the load transfer happens.

⏺Shear force mainly causes shearing stresses, which can lead to diagonal cracks in reinforced concrete if not controlled.

🚧Bending Moment refers to the internal moment (or turning effect) developed in a beam when an external load tries to bend it.

⏺It is the result of forces acting at a distance from a point, producing rotation or curvature in the beam.

⏺The bending moment is maximum where the beam tends to bend most (usually at mid-span under uniform loads or near fixed supports).

⏺It causes bending stresses — tension on one side and compression on the other side of the beam’s neutral axis.

⏺Bending moment gives the beam its curved or deflected shape under loading.

📜In summary:

⏺Shear force cuts the beam; bending moment bends the beam.
⏺Shear force resists sliding between layers; bending moment resists rotation and bending.

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