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SHEAR FORCE AND BENDING MOMENT

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Definition:
Shear force:The force which tend to shear off the section and is obtained as the algebraic sum of all forces including the reactions acting normal to the axis of the beam either to the left or right of the beam.
Sign convention
Positive Shear Force Negative Shear Force
Sign convention for shear force in brief
Direction Positive SF Negative SF Left side Upward force Downward force Right side Downward force