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]

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mood

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GRADE? what did you score?

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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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[@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.

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noticed that too! :)

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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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relatable ngl

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thank you so much! I was so confused on how to sort out whether or not the members were in tension or compression, but this cleared it all up!

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[@He787878787787]

HE is 3.54kips compression - small error

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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 !!

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[@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.

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