Reinforced Concrete T Beam Design Example using ACI 318 | Neutral Axis in Web | PE Exam Prep

[@djphonix]

Good stuff, man. One item though, the effective flange table refers to the clear distance to the next adjacent web rather than the C2C distance. Otherwise, great job explaining the topic!

[@Kestava_Engineering]

Philip you are absolutely right! man read it and looked right over it. thank you for the correction, and thankfully it did not control in this instance. keep checking my work! I always appreciate it.

[@Kestava_Engineering]

SHOOT IT DOES CONTROL!

[@djphonix]

@@Kestava_Engineering hehe yeah I noticed it controlled while watching and was thinking “aww man, I hope nobody roasts him on this!” Really enjoying your videos so you won’t get any roasts from me 👍🏼

[@Kestava_Engineering]

@@djphonix My man I appreciate all the support! Keep me honest always! also it looks like the totally capacity is still correct as the effective width would still be up to 34" so we are OK from a liability perspective haha. dodged that bullet... this time!

[@jonathanlitoff5142]

@@Kestava_Engineering If the width of the web is constant, then wouldn’t b.web + clear span always be equal to the dimension between web center lines? For this problem, it would be 10” + 24”, or 34”. Also, I really enjoy these PE related videos

[@sallymcfadden3940]

These videos are really outstanding. Clear and so well delivered with humor and goodwill.

[@jacksonmurrell445]

Thank you Rich!!!! Please continue with these videos, you do young engineers a huge service.

[@Mirand.uhhhxx]

Your making me feel good that I keep catching these little mistakes! Love your vids

[@Kestava_Engineering]

Glad to help! and thank you!

[@briangollini]

keep up the good work

[@elbahja03]

Great video man , as always, thanks a lot! I think you're missing 1 more step after you got you "a" value you should get your "c" value and do a strain compatibility check to make sure you're in the TFC zone, otherwise your reduction factor may be lower than 0.9 and thus your ultimate moment capacity may be lower. Thanks!

[@Kestava_Engineering]

Good call! tension force controlled members is for sure a must do check!

[@chandrasajana2299]

thanks man, keep going!!

[@NataliePadgett-b9e]

Thanks for making these! Quick question, should your a value be the NA of the compression area from the bottom not from the top? That way you have the correct moment arm distance to the tension force. I am finding my a = 1.22".

[@sugassuwag7513]

a is not the distance from top to neutral axis, it is the width of the compression block. therefore he use Mn = .85*f'c*Ac*distance between T and C. Distnace between T and C is calculated as 12-1.04 = 10.96"

[@곰탱이-k3r]

So helpful. Appreciate for your efforts. BTW, what about the case to find the reinforcement area (As) if the moment capacity is given? Is it the same approach?

[@sereneobscene]

Great video, like all of them! One question though... at the end, shouldn't the moment equation have ("a"/2), so (1.04"/2)?

[@aej-xw7hi]

No, since a is the total height of your compression block for a rectangular section, a/2 is actually the centroid from the top of beam. Since you're finding that centroid distance through the summation of areas for the T beam, dividing by 2 isn't necessary.

[@aej-xw7hi]

16:52

[@huseyinsanal]

Thank you for videos, so helpful. I like your engineering approach. I have an question regarding effective flange width. As per ACI 318 ( 6.3.2.1. ), the effective flange with bf shall include the beam web width bw plus sn effective overhanging flange width in accordance with Table 6.3.2.1. I think effective flange width calculated as bf=bw + min ( 8h, sw/2,ln/8). Am I wrong, if I am where is my mistake? Thanks.

[@Kestava_Engineering]

you are correct! just remember you get to take the value and multiply by 2 to account for each flange. I may have made a mistake in my video!

[@chris_3851]

Husey, it's calculated as bf=bw + 2[OVERHANG] --> bf=bw + 2[min ( 8h, sw/2,ln/8)]. For a standard T-beam, there is an OVERHANG on both sides so we have to multiply by (2)

[@jonsoh5309]

this is very helpful! Could you do a similar problem where you have to find ultimate moment but with fully composite beam?

[@Kestava_Engineering]

Jon Soh consider it added to the list my dude. I see you like to spice things up.!

[@yemanemelkamu5682]

but according to ACI sw refers to clear distance between webs ,there for the least would be sw/2=(34-10)/2=12in not 16 in

[@muhammadasadameerkhan8105]

perfect video. sir can i have get in contact with you for some knowledgeable discussion??

[@Kestava_Engineering]

email me anytime! my contact email is in my page description

[@winterpalace2307]

Can you do base plate and anchor bolts design for steel colomn please, I have been looking for it since a while now . Also would you mind giving me your Email in Case I needed to ask questions , thanks dude you're doing a great job 👍

[@Kestava_Engineering]

Winter Palace - I love the idea, consider it added!

[@vampirekabir]

change ur channel name to "the cool civil engineer"

[@Kestava_Engineering]

Doing everything I can to show the "Cool" side of structural engineering!