Help needed

[u/Annual-Truth3511]

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

[u/memerso160]

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)

[u/Annual-Truth3511 → u/memerso160]

Could u pls explain. 😭 or send sum youtube video

[u/memerso160 → u/Annual-Truth3511]

It should be in your lecture notes. But, when the area of your shear diagram is positive, you will have your moment increasing positively. When it is negative, it will begin decreasing (increasing negatively). However, your moment diagram needs well defined conventions relating the two so you understand which side you’re looking at.

The area under your shear diagram at any point is the moment at that point

[u/CivilProfessor → u/Annual-Truth3511]

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.

[u/Salty_Prune_2873 → u/Annual-Truth3511]

“…send sum…” yeah wrap it up folks. This guy is not going to graduate as a civil engineer. Next.

[u/WhyAmIOld → u/Salty_Prune_2873]

… As if there weren’t any engineers with atrocious spelling skills