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Because there are no vertical forces applied to the ABCDEF system there.lc99 said:How come the pins at B and E don't affect the shear or moment diagram?
A moment/shear diagram is a graphical representation of the internal forces acting on a beam or structural element. It shows the variation of shear force and bending moment along the length of the beam.
A moment/shear diagram is created by analyzing the external loads and support reactions acting on the beam and calculating the internal forces at various points along the beam using equations of static equilibrium.
The purpose of a moment/shear diagram is to help engineers and designers understand how a beam will behave under different loading conditions. It is also used to determine the maximum shear and bending moment at critical points on the beam.
To interpret a moment/shear diagram, you should first identify the type of loading acting on the beam (point load, uniformly distributed load, etc.). Then, follow the diagram from left to right, noting any changes in shear force or bending moment. The magnitudes of these forces can be found on the vertical axis.
Moment/shear diagrams are essential tools in beam design as they provide information about the internal forces that must be considered when selecting the appropriate material and dimensions for a beam. Engineers use these diagrams to ensure that the beam will be able to support the applied loads without failing.