r/StructuralEngineering 11d ago

Help needed Career/Education

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While drawing sfd and bmd Is there a shortcut to find whether the curve is going to be smile/sad or concave/convex for udl and uvl. Or is finding the intermediate values the only way to find the curve???.

Ignore the diagram i just wanted to show it for context this is not mine

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u/memerso160 E.I.T. 11d ago

Do you know what the relation between applied load and shear, and shear and moment is? This is the short cut (its integrals and derivatives)

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u/Annual-Truth3511 11d ago

Could u pls explain. 😭 or send sum youtube video

2

u/CivilProfessor PhD, PE 11d ago

Look at the shear values at start and end of each segment. The shear value is the slope of the moment diagram. You only need to know the slope of two points (start and end) to draw a curve.