FE Civil Concrete Design - Modulus of Elasticity

[@biniamtesfu2489]

Heyyyyyy I got my FE results....I passed and thanks for ur informations!!

[@Genieprep]

I am so happy to hear that! Congrats 😊

[@biniamtesfu2489]

enGENIEer Yeah u were helpful too Can we share our email?

[@Genieprep]

@@biniamtesfu2489 Yes of course, my email is [e-mail]

[@faresaba5107]

Hey biniam tesfu any feedback from your exam ? Did you got similar question to this channel

[@mousemarie4168]

U r the best. U help me gain not only the understanding but also the confidence 😭

[@jeremymurphy8151]

The weight of concrete doesn't have to be in lb/in^3?

[@drewnezelek6962]

Yes I was wondering this as well.

[@Genieprep]

So the way the equation is derived, it takes care of the conversion from lb/ft^3 to lb/in^3. Therefore, the weight of the concrete has to be in lb/ft^3 and the compressive strength has to be in lb/in^2 not ksi.

[@JOHN_1997]

why the weight of the concrete is in lb/ft3 and not converted to lb/in3???

[@ThePhanttasm]

It's sorta crazy how they seem to have everything but the weight of concrete. Like what other numbers do I have to memorize for the FE?

[@hassanmohammed3949]

thank you so much you are amazing ,when I put 150 or 145 for wc?

[@Genieprep]

So if you have reinforced concrete use 150 pcf, but if it unreinforced concrete use 145 pcf. I hope this makes sense!

[@sideoftheham420]

Is there a way to know if equations take care of conversions? Like in environmental engineering, you have the CxMGDx8.34 or the modulus of elasticity equations but there are others where you have to make sure you've converted everything for consistency.

[@Genieprep]

That is a good question. Most of the equations on the reference manual that are similar to this case, the units are specified for each variable, but some are not and you just need to remember them. Also, check out this video, there is a conversion that you need to know if you are using the pump formula, kzbin.info/www/bejne/iHS9mWuiZp6rZsk. I hope this helps and good luck!

[@jrojas6716]

Great Videos!

[@TamNguyen-dv7hu]

I have something similar to this on my exam but I think it asked for Modulus of Rupture.

[@dayanaarrue376]

How does one solve for this @enGENIEer ?

[@rachideddanfil4225]

missing to covert 150lb/ft^3 to lb/in^3

[@1crida1]

Incorrect. This formula requires the weight of concrete to be in lb/ft^3. They have a similar problem on the official FE Civil practice exam.

[@afghandydynamite9767]

Hey would the weight of concrete be given or should we just memorize it?

[@Genieprep]

Hello Afghandy, when I got this question, I was not provided the weight, luckily I remembered from my concrete class. So I would recommend that you just memorize, it would not hurt. I hope this helps and thank you for watching. Please share with your friends who might find this video helpful. Good luck!

[@gregwilliams6934]

How do your units work out in the problem to be psi because I get the final units to be lb^2/(ft^4.5*in)?

[@Genieprep]

That is a good question, but the unit conversion is already taken care of in the equation, some equations like the rational method in hydrology, the units don't add up but it is already taken care of in the equation. So for this equation, make sure that fc is in psi, and the w is in lb/ft^3 to get psi. I hope this answers your question and good luck with your studying!