Moment Distribution Method Example 1 (2/2) - Structural Analysis

Introductory example problem applying the moment distribution method on a statically indeterminate beam.
Part 1 demonstrates the application of the moment distribution method in detail.
Part 2 shows you how to draw shear and moment diagrams once you have determined the member end moments.

[@Nondescript69]

you're
the greatest man alive

[@alexfedal980]

Wonderfull!
Thank you so much. I was stuck in drawing SFD and BMD. Tomorrow have an exam! thank you again. THIS VIDEO LECTURE MADE MY DAY.

[@adzzino]

how did it go bro? i got mine in 2 days lool

[@alexfedal980]

@@adzzino THAT WAS 6 YEARS AGO LOL

[@adzzino]

@@alexfedal980 looool did u study civilengineering?

[@structurefree]

This is part 2 of the introductory moment distribution method example. It details how to take the end moment results and draw the shear and moment diagrams. Normally comparing end moments to a computer programs results are a good way to verify the computer output is good enough.

[@bladesxf5575]

A couple of questions on here (by the way, great tutorials and refreshers):
1. At 2:20 you mention you'll substitute Vba with a negative number but adding two negative values would make Vab = 37.29k, not 12.71k. Did you mean to substitute with the upwards positive Vba?
2. At 2:58 finding Summation Mb, how come you don't include Mcb into the equib. equation like you did for Summation Ma using Mba?

[@structurefree]

Thank you for your questions and catching the typos. At 2:20, there's an annotation that indicates the equilib. equation should have been V_AB - (1k/ft)*(25ft) - V_BA = 0. The result for VAB = 12.71k reflects the corrected equation.
At 2:58, I forgot to include Mcb in the equilib equation when I was recording the video. The result of Vcb = -9.19 kips is from the equilib equation with Mcb included.
I have added annotations to the video.

[@codydemers4257]

i don't understand how that is possible because if your saying ....... V_AB - (1k/ft)*(25ft) - V_BA = 0..........then it would be V_AB - 25 -12.29.......and -25 - 12.29=37.29.. i don't understand

[@vietannguyen4453]

Really thank you for spending time making such a great valuable video.

[@LeAnneB2010]

Thank you SO much for these videos! Total lifesaver!!

[@moshi7451]

You can really teach!Thank you very much!!! Just good teacher!

[@springsolstice]

Dude, this is so helpful! Thanks a lot

[@structurefree]

+Sophie S-M you're welcome!

[@ayaan56]

Saved my life!!!!

[@mielvicpanton8507]

thanks a lot, this is very helpful

[@mulugetaalemnew5957]

the lecture was great

[@rajimustapha2178]

while doing moment around point b, you didn't consider the 34.686 at C

[@niloychowdhury1608]

Great Vdo!! Thnx

[@Potatochyps]

simply awesome

[@francescomurano7505]

Awesome, thanks.

[@luisrojas7816]

Thank you soooo much!!!

[@DacoRoo]

I'm not sure why no one has said this. His calculations are not correct. For Vab, you have to subtract Vba, look at the diagram again to see this. For moment for BC, he left off the second moment at point C, so it should have -35.686 at the end of that equation. This gives you the -9.19.

[@hejm8421]

Yeah I'm thinking, the same too, I was thinking too hard to figure anything out why my comprehension doesn't match his, like what is wrong with my logic. He include both end moments in frame AB why not with frame BC? This question demands an answer.

[@sharingansk]

Thanks alot mate!

[@giftsonsamuel2627]

Can we use moment distribution method for continuous beams with internal hinge?. Should we release the moment at internal hinge at the first step as we do for the end hinge support?. Which method do u recommend to analyse a beams with internal hinges

[@milindayapa3307]

Can you also do some videos on other methods of structural analysis... Ex-Force method and displacement method.

[@Ako_si_Mela]

Im confused that you always change the directions of your moments, you draw all the shear moments upward but when you plot it in the diagrams you followed the signs that you have calculated earlier. Then when you calculate the "By"you changed again the direction of the shear moments downward 😢 why is that?

[@freddiepallugna4409]

Will i get the same answer if i used other method such as slope deflection method? Thank you 😊

[@structurefree]

I hope so.

[@structurefree]

I hope so.

[@mohammedashique4688]

Sir, Why are you taking different sign conventions in moment distribution method and slope deflection method??

[@uknowtv8098]

hi sir. how to calculate the moments using three moment method if one support was displaced vertically? thanks so much

[@nedmelvin1469]

Why havent you considered the end moment at C when calculating for Vcb!??!?

[@twanaismail4314]

2:45 i think in Sigma moment B, you forgot to include moment in point C

[@nedmelvin1469]

Ikkkk

[@jora30709]

HI, is it possible for you to do a moment distribution method for frames question? thnx so much

[@structurefree]

jora30709 this is definitely on my to do list. hopefully before summer.

[@shankarganeshk3367]

+structurefree dude....what do you do for a living

[@structurefree]

edumacator.