Shear-Force & Bending-Moment Diagrams Distributed Loads€¦ · Shear-Force & Bending-Moment...
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Shear-Force & Bending-Moment Diagrams
Distributed Loads
Learning Objectives
1) To evaluate the shear-force and bending-moment diagrams for systems
with discrete loads.
2) To do an engineering estimate of these quantities.
Beam Sign Convention
Distributed load - An upward load is positive
Shear Force - A positive internal shear force causes a clockwise
rotation of beam segment. (i.e., it pushes a left-
facing cross-section upward or a right-facing cross-
section downward).
Bending Moment - A positive internal moment causes compression in
the top fibers of the segment (i.e., clockwise on a
left-facing cross-section or counter-clockwise on a
right-facing cross-section).
Procedure
1. Determine support reactions
2. Specify beam sections origin (left end) to between each discrete load
(force or moment). Be sure V and M are shown acting in the positive
sense.
3. Sum forces vertically to determine V
4. Sum moments at sectioned end to determine M. (This eliminates V
from the moment equation).
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