Statics: Lesson 49 - Trusses, The Method of Sections

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[@joreilly]

I was sweating until the very end when he said REMEMBER - DO NOT CONSIDER THE MEMBERS YOU DON'T CUT. Jeff, you solved about 10 years of me hating this method with that statement. I've always screwed that up and over-complicated my problems.

[@SuperPenguinpenguin]

This is huge. I was so confused why he ignored EG in the sum of Y forces eq.

[@solomonmule3414]

it was the same with me

[@martinAbC]

​@@SuperPenguinpenguin I made the calculation later for EG, and it's equal to zero. But if there's zero reaction, why even have a member there? What's the point of having a structural member with zero force? Why not just remove it then?

[@EsotericWizard]

@@martinAbC for loads -- ie a bridge needs to handle movement of cars, wind, etc. it's just that the current forces don't make use of the member, but it would have purpose in another situation

[@annieleila4638]

Hey Jeff, i wanna take this moment to thank you for teaching me statics. I didn’t know what’s going on in my statics class until my friend recommended me to watch your videos. Here I am at 4Am watching them for my final which is at 7AM. Whatever grade I get, it’s because of you, sir!!! Merci pour toutes 🙏🏿🙏🏿🙏🏿

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mood

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Mood

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Your watching his video at 4am when your exam is in 3 hours? Don't put whatever grade you got on him 😂 that's not fair
I'm just joking, but seriously not sleeping and cramming is not a good idea

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I never understand anything in class buy you are always my last hope and you never disappoint. Thank you for clearing all my confusions sir

[@LeonKarni]

Hey Jeff, great videos! Really clear and personally, they l have helped me out a lot. So thank you!
You have a small mistake at the end of the video Calculating HE (should be 3.54 or(2.5/sin(45)= 2.5*2/√2) not 3.34) this means that DE is an even 12 not 11.86)
Hope this is helpful. Keep up the good work.

[@gp7493]

noticed that too! :)

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[@nicolas13brito]

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[@georgesadler7830]

Professor Hanson, thank for explaining Trusses and The Method of Sections with a massive example. The step by step process is very helpful for solving Trusses.

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Thanks so much!!!

[@He787878787787]

HE is 3.54kips compression - small error

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[@willpope302]

Incredible explanations thank you very much! The way you labeled what would typically be joint “C” as being joint “D” kind of bothered me lol, but regardless you’re the man!

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THANK YOU ❤

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[@astonxnm9356]

Sir , As we cut the truss into two frames and use the moment equation to solve further , how do we decide ,about which joint it would be more convenient to take the moment about? for example in the above Q we took moment about E!, In other problems including big trusses this point is confusing !!

[@omaimakamran4795]

Thankyou so much!

[@drogones12]

Jeff, I got confused when you were solving for DE. It looks like force DE and 3.34*cos45 should have the same direction. so I am thinking the Fx force summation is 0=9.5-3.34*cos45-DE. Can anyone clarify this for me and much appreciated.

[@Subcritical96]

Thank you Jeff. Great videos. Calculation at the end should be HE=3.54 kip (C) and DE=12 Kip (T). You do have it set up correctly. Again thank you for the great videos.

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Thank You For This Lesson, Can You Please Do A Video On Influence Lines For Truss ? That Would Be Very Helpful

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