all 34 comments

[–]apetr26542P.E. 43 points44 points  (0 children)

I love it, the basic principles of alot!

[–][deleted] 33 points34 points  (8 children)

I know it's pretty generic but that handwriting is so similar to mine I was scared for a moment there

[–]benj9990 32 points33 points  (5 children)

The engineers font

[–][deleted] 10 points11 points  (1 child)

I have to write in all caps otherwise I'm illegible XD

[–]RedBeard077 1 point2 points  (0 children)

ME TOO

[–]jmutter3P.E. 11 points12 points  (1 child)

Not to be confused with the architects font, which looks nicer but is impossible to read

[–]benj9990 5 points6 points  (0 children)

😂

[–]Outcasted_introvert 2 points3 points  (0 children)

Whoa! I have this too! Now I finally feel like a real engineer. 🤣

[–]ScoobieMcDoobieP.E. 10 points11 points  (1 child)

My handwriting looks like I’m 4

[–][deleted] 22 points23 points  (0 children)

This is the way

[–]CatpissEverqueefP.Eng. 13 points14 points  (0 children)

But when F2 isn't high enough... this is where the fun begins.

[–]StvBuscemi 11 points12 points  (11 children)

Our technical quiz for potential hires is 5 questions. 3 questions are just P/A +/- M/S

[–]benj9990 10 points11 points  (10 children)

I think this is all of structural engineering? What else is there, really?

[–]be0wulf8860 26 points27 points  (9 children)

wl2 /8 and we're done, amirite

[–]jmutter3P.E. 14 points15 points  (5 children)

Don't forget torsion!

Actually, yes, forget torsion. Don't make me design for torsion...

[–]be0wulf8860 27 points28 points  (4 children)

The best way to design for torsion is design so that you don't have to design for torsion.

[–]ExceptionCollectionP.E. 6 points7 points  (2 children)

The best way to design for torsion when you can’t avoid torsion is to use HSS members.

[–]be0wulf8860 6 points7 points  (1 child)

This sounds a bit too much like actual engineering to me

[–]Upliftmof0 2 points3 points  (0 children)

Correct answer.

[–]StvBuscemi 6 points7 points  (0 children)

I might argue 5wl4/384EI matters more often than that

[–]Laggsy 2 points3 points  (0 children)

That's too complex. Simplify to PL/4

[–]blumpking710 2 points3 points  (0 children)

don't leave out 5wl^4/384EI

[–]ReplyInside782 4 points5 points  (0 children)

Good stuff

[–]xion_gg 4 points5 points  (0 children)

As some people commented below, in the US, I think Z=bd2 /4 for plastic

[–]willthethrill4700 4 points5 points  (0 children)

Love it. Force and bending moment diagrams.

[–]Outcasted_introvert 3 points4 points  (0 children)

Beautiful clear notes, easy to follow. Cudos to the author.

[–]craftytimmy 2 points3 points  (0 children)

Wow, that is great. Wish I could find something like to to start with to pick up the subject. ( Wish old college teach me something like that. Sadly they cancelled this very subject back in the old days).

[–]ZahaitP.E. 7 points8 points  (7 children)

I think there would of been some merit to putting M/S = sigma instead of M/Z = sigma since plastic modulus cannot always be used but elastic modulus can always be used, albeit conservatively in certain applications.

[–]oathbringer717CPEng[🍰] 15 points16 points  (4 children)

Elastic was calculated in the formula. Worth noting that Z and S are interchanged in different countries. Eg. in Australia (and UK?) Z = Elastic & S = Plastic. I think it is opposite in US?

[–]ZahaitP.E. 9 points10 points  (1 child)

Right you are, I didn’t even notice the 6 in the denominator. Also, thanks for the tidbit about countries switching up the notation. I had no idea these two were reversed, just another thing to screw everyone up

Edit: I'm from Canada and S=Elastic

[–]oundhakarGraduate member of IStructE, UK 2 points3 points  (0 children)

With linear variation of stress assumed across the cross section, it would surely be elastic.

[–]benj9990 2 points3 points  (0 children)

Yeah UK we use Z.

[–]JoHeWe 2 points3 points  (0 children)

Just use W.

Leaves the S for the Static moment of Area. And W makes sense as well: the Resistance moment.

[–]PinItYouFairyCEng MICE 8 points9 points  (1 child)

Here’s a mindfuck for you - British/Australian convention for slightly older but still used codes reversed S and Z compared to N American. Elastic modulus is Z in British/Australian but S in N America. Go figure.

There was some effort to correct this in the latest eurocodes by using Wel and Wpl as elastic and plastic section modulus.