11-02 - Example 2 - Moment-Axial Load Interaction Diagram for Reinforced Concrete Column

This example goes through how to create a moment-axial load interaction diagram for a reinforced concrete column. The points found in this example are (A) pure compression, (B) balance point, (C) pure flexure, (D) pure tension, and (E) tension-controlled.

[@nidalal-sayed4019]

Doctor u are so much great.
I never saw before like these accurate explanations.
Thank you so much for your help.

[@berkayyildirim27]

Greaaat work excellent. It was so useful for my structural fire safety homework thank you so much again.

[@alinikaeen9089]

Good Lecture. It is explained clearly and step by step.

[@vishalghule2103]

Thanks for the detailed example. Really helpful.

[@LEON-vt8zz]

Thank you sir very helpful to my study.

[@MVR0001]

At 8:44, shouldn't the lever arms be measured from c, rather than the PNA?

[@alexstewart2740]

At 14:16 you have C_s1 = .003(29000)*((3.4-2.5)/3.5) = 92.1 but those numbers equal 23.029? Or is there step in there I'm missing?

[@Mr.P539]

Just forgot the As1=4 sqr in
.003As1Es(c-d’)/c= 92.1

[@saikaushikkothapalli4059]

Great explanation and Awesome job. Thank You!
Is this analysis true for both short and long columns?

[@qusayfarahteh9794]

Life saver❤️

[@nidalal-sayed4019]

I think measurements are referred to aci code.
Am I true?
I wanna be sure to program it on excel sheet

[@MuhammadUsman-eq7jz]

well done

[@pPP-df2gw]

At Start of video you mention PNA is at mid height. Really so for RC?

[@omerfaruk7488]

Sir what is plastic neutral axis? Is there a elastic neutral axis too?

[@Pusvanurmalasari]

Thank you

[@martrayleigh7988]

Sir, when doing load-moment interaction I should make my own column section?

[@engrashidds.battah9429]

Shouldnt the comp. Force in the steel be
4(60)-4(0.85)(4)

[@juantroncoso1]

I agree, I see that on all text books Cs1=As1(fs1-0.85 f'c)

[@rolandalphs7022]

How do you calculate for moment and axial load between point A and B?

[@davidgarber1664]

You can select a "c" that is greater than the c we found for point B. Another common point found on the diagram is where there is zero tension in the tension steel (c = d). If you set up a spreadsheet, you can find the points associated with many different c values.

[@martrayleigh7988]

@@davidgarber1664 sir please reply, the zero strain can be higher than d? and how do I input c for the value between point A and B.

[@mariamagbazet3675]

How did you find Ecu ?

[@medo2000egypt]

is that according to euro code ???

[@saikaushikkothapalli4059]

ACI 318. American concrete institute