Cracked Elastic Section Analysis Example 1 - Reinforced Concrete Design and Analysis

Introductory example calculating stresses in a reinforced concrete section with cracked-elastic behavior. Illustrates the use of the transformed area method to locate the neutral axis and calculate the moment of inertia.

[@satazer5824]

Man I mean, you are absolute mad lad, a life saver. Thank you so much.

[@morganoconnor4486]

Finally...first explanation I have found (after quite a bit of searching) for why the area moment of the transformed steel section about its centroid is neglected and only the second part of the parallel axis theorem is applied on the transformed steel section. Thanks!

[@structurefree]

Here's an example of a cracked-elastic section analysis for a reinforced concrete beam section...it's a good review of composite materials for introductory mechanics.

[@lawangbacha]

Man, you are a legend. I found every video of yours interesting and precise.

[@mdsofiullah9688]

Love from Bangladesh
really appreciate your video, very helpful me

[@PrinceAbubu59]

1 like and content. . Woo hoo! !
Your videos are awesome and really helpful for students like me who has prof who don't know nothing!
Thanks a lot for your work!!

[@goranstekovic8835]

Dude, I don't know who you are, but you are awesome!

[@sandhya3466]

Very well explained!

[@MSTK-qp4uz]

At 7:17 .. Why did you use the positive value for Cna and you have already defined that the positive value is downwards>>
Thanks alot for the super helpful videos...!

[@juhmickm4410]

Uploaded right as I sit down to do some reinf. concrete design

[@farrukhkhan8191]

THANK YOU

[@sangmolandry977]

excellent

[@iSuppi]

Can you make a video on how to use the reinforcement to determine whether compressive steel or tensile steel has yielded or not for DOUBLE REINFORCE concrete beams? I know there is another way of doin it but my professor did it another way and I'm hoping maybe you might explain it better than him.

[@tetelokgomoesoana8973]

excellent . you should be my Professor

[@structurefree]

The Pruhh-FESSS-uhrrr is in the hizzy.

[@lukeabear7582]

I love you

[@enzille]

Can you please do a video for the Un cracked Section Analysis..pretty please

[@jabulanimabuza6229]

ruclips.net/video/N8KsRHEt8jE/видео.html
I guess the approach is that of using the cracking moment calculation.;

[@jabulanimabuza6229]

great stuff, thank you

[@allanjonathan1349]

Brilliant

[@structurefree]

Thank you!

[@snowneedle]

very helpful....thank you

[@structurefree]

+snowneedle I appreciate your comment!

[@andresfeliperodriguez8257]

Hello @structurefree All your videos are just great.. you explain really good,
Can you (OR SOMEONE READING THIS) solve me these 3 questions that I dint get
1) What is the strain PL, for the concrete... It is the limit but how can I calculate it
2) same question but with the stress PL for the concrete.
3) I remember sometimes using (n-1)As... can you explain me when is this used
Thanks..

[@IshfaqBashirIM]

how to calculate the neutral axis of a reinforced concrete pipe section. if you can make a video of that as well. Would Appreciate. #structurefree

[@user-kh9kn2sx6z]

How does the number of steel reinforcements affect the problem? For instance if there were only 2 steel rods instead of 3.

[@user-kh9kn2sx6z]

Never mind, realized that #9 bars had a cross sectional area of 1 in. therefore 3 of them would give a total area of 3 in. Was just confused on that part. Very helpful video, thanks!

[@beenay18]

how would steel bars effect the modulus of elasticity of concrete section? I need the moment of inertia and modulus of elasticity of reinforced concrete section with effect of percentage of steel. actually I need it because I need stiffness of column to calculate the stiffness of whole story of the building. I modeled a RC building in etabs. etabs gives me stiffness of the story after I run the analysis. but i haven't even run design. How did it calculate the story stiffness even before the reinforcement percentage in column is determined. Is it calculating stiffness of columns with no reinforcement in it ? or is it calculating stiffness of column with minimum required percentage of steel? will it change the stiffness of columns and then the stiffness of whole story after I run design in accordance with the amount of steel it calculates for each column? is the stiffness of the whole story sum of stiffnesses of all the columns of that story?

[@thetom1102]

how is he getting the modulus ratio?

[@sammanalo1105]

Sounds like Chris Evans is talking lol 😂thanks btw

[@MisterBinx]

Doing this problem I have no idea how to calculate moment of inertia for the transformed section. The book just gives an equation but doesn't explain it.

[@structurefree]

😥

[@civilideas1925]

👍🏻

[@happytube4183]

LIKE

[@andreicristian9575]

Did you manage to learn metric since making this video?

[@structurefree]

Yo no se.

[@fanaralnuaimi834]

transulate the vedio ....please

[@g.zoltan]

BAAM!!

[@y_p7]

Thank you sooooooo fucking much!! If * I became a millionaire I'd donate half of my money to you!! *

[@structurefree]

I'll remember you wrote this comment. I'm hoping internet comments are legally binding contacts.