![]() ![]() Trusses do NOT have shear force and bending moment diagrams.Pinned/roller ends do NOT have moment reactions, but they can have externally applied moment. BMD is continuous. AFDs and SFDs may not be continuous.If shear is zero, bending moment is constant (can also be zero).Shear = rate of change of moment (a.k.a derivative or slope of moment). ![]() But before we do that, we should understand the following basics: The best way to learn AFDs, SFDs, and BMDs is to practice drawing them with a few examples. As shown in the the figure below, this means that the compression side of the member represents positive bending moment. Keeping a consistent sign convention is extremely important! We are going to define the positive sign convention as: To be consistent with our convention, BMDs are drawn on the compression side of the member. They help determine the material, size, and type of a member given a set of loads it can support without structural failure. Axial, shear, and bending moment diagrams (AFD, SFD, and BMD) show the internal forces and moments along a structural member. ![]()
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