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S.F & B.M. diagrams for beams subjected to point load


Shear Force Diagram for point load:
At any point shear force is calculated by taking algebraic sum of all forces left or right of section.
Sign conventions
The sign conventions are used to calculate SF as mentioned below,

Bending Moment Diagram for point load:
At any point bending moment is calculated by taking algebraic sum of all moments in left or right of section.
Sign conventions
The sign conventions are used to calculate BM as mentioned below,
In above both fig. X-X is section line. The sign conventions are followed with reference to this line. If we consider left part of section then consider only left side arrows and for right side consider only right side arrows. This concept will discussed in following problem.

  1. SFD and BMD for centrally point loaded beam
  2. SFD and BMD for eccentrically point loaded beam

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