Method of Virtual Work - Truss Example (Part 1/2) - Structural Analysis

[@donovan4437]

I was stuck on a problem so I decided to generally search for help relating to this concept. This video happened to be the example I was stuck on, god bless you.

[@zaiyuanlu8751]

I really like the enthusiasm he has It makes the lectures really fun

[@JasmineChaii]

Thanks for your lovely videos. Without your channel, I will probably fail this course!

[@Randomkloud]

Wow, there is one! Great! I've been having a hard time to understand this till now.

[@FaReS4201]

Hello I'm so glad I found your channel again, You helped me so much in uni :D Thank you for your work !!

[@structurefree]

🙏 lost and found with structure free!

[@TheBadaii]

In the virtual structure, when you are isolating the joints, how do you know that fast that the bar loads are zero?

[@Test-ri2kr]

7 years late I know sorry buddy but if anyone is interested There is a video made by engineer4free (I think) who tells you how to determine zero force members by inspection

[@PKKK16]

@@Test-ri2kr i think he already graduated hahaha

[@aprilkhodayarinezhad6430]

I wish my teacher's watched your videos too.

[@structurefree]

keyvan Khodayarinezhad me too.

[@rugbyrocks123321]

I wonder if you have some videos for trusses subjected to temperature changes or fabrication errors, or maybe a combination of both? That would be splendid!

[@structurefree]

+Arden P that is a good idea, I will add that to my list.

[@azeemiqrah]

these videos are awesome!!!!!!!!!!!!!!!.... there s a culprit around some where.... who cant understand structures and disliking lol..

[@structurefree]

ballers gonna ball, haters gonna hate.

[@Jjared-ff9km]

i don't know where did you get the 0-AB /+1-BC/0-CD/DA-0/0-AC @5:22 ahh my exam is today -__-

[@ericmathis8621]

You account for the actual width of the truss with the variable A in the calculation. For the analysis of the forces you view it 2d.

[@ekarajprakobkit8406]

Thanks, You save my life!!

[@Alpha-Amir]

Would it still work if you applied a virtual load vertically instead of horizontally?

[@structurefree]

You would then be trying to calculate the vertical displacement.

[@tatendamutero2423]

What would you do if an extra member was placed on joint BD with displacement required at the same position as the original question

[@PeterSsemakulaMukiibi]

Peter Mukiibi 1 second ago A question here; in the the virtual work method for evaluating displacements of nodes in a truss, do i have to calculate deflection in the x-direction and then after the y-direction in the case where the node experiences both x and y forces? (i.e applying unit load displacements differently for both cases

[@JinFM1998]

thanks man, helped me a lot.

[@gurseeratkhalsa733]

what if you are trying to find a force applied at a joint to keep the deflection at that point 0?

[@1crida1]

On your virtual structure, did you forget about the 10 kN downward force at Point D?

[@falcon5860]

while calculating the moment about B, you took the anti clockwise as positive. Ax is clockwise but you still took it as positive. If I am wrong correct me pls.

[@zayeaye3842]

For step 2, for summation of forces in the x direction, wouldn't Ax= 1 ?

[@arunachans]

when you used basic statics to find Ax in the real structure , shouldnt u have considered the 5kN reaction at C during the equilibrium moment at B.(Slide at 6:07). I calculated Ax to be 11.25. I am not sure but can u explain please..

[@thomasmcnamara9970]

Arun Mathew if you take moments @B the 5KN force is applied in the same line of action of point B and considering moments is force x perpendicular distance and the 5KN is acting in like not perpendicular you do not include it in moments calculation However for sum of forces in x you definitely need to consider the 5KN load

[@anitasimpson4406]

dont Ax and 10kn cause moments in different directions how come they have the same sign

[@ghassaneissa7252]

Exactly what im trying to figure out.

[@PCgamerChannel]

If you do method of joints on A you dont get zero for member DA though

[@Rachael4687]

holy crap! love your video~!understand everything now!~

[@tagelasfiarania6519]

"it could grow " lol 😂😂😂

[@gideontamunyela2322]

I want for videos, related to vitual work.

[@maythwehtun2117]

Hi. How did u know that AB, CD, DA and AC are equal to zero?

[@koroshheidary31]

very good

[@mominmohammad]

is it 1 dimensional or 2 dimensional

[@nic1922]

dude sounds like dave franco lol

[@atokznenekz5473]

god bless you

[@structurefree]

🙏

[@finianholland7654]

What is EA?

[@structurefree]

E is modulus of elasticity and A is the x-sectional area.

[@ultranoobcodm]

EA is electronic arts

[@mimiabraham8192]

loooovvee this :)

[@karimkhan1312]

i wish i was u r student - amarjit advocate delhi high court india

[@structurefree]

I wish I was my student too.

[@ultranoobcodm]

hehe lol @@structurefree

[@burakceylan9409]

4:12 ab bc cd da ac DC !!! :DDD

[@habiby4ever]

your video could be very helpful if you slow down .you are very passion about what you doing and that's not a bad thing.but you need to understand that they are people exist need things to be explained in the slow way or a way pretending that your audience don't know what you are talking about,so you need to explain little thing even very quick not in details!don't assume that everyone can understand you with this speed of a blink of an eye!!!You are a very fast talker !!!you don't understand the power of your voice speed!!!too bad!I really wanted to watch your video,but i will have to skip over it!!