Underground water tank design 

Thank you for your video. Why we did not re-check the thickness of concrete that we assume? Kindly advise please.

Nicely explained in a simple way. But the main steel for the vertical walls to be placed vertically not horizontally as mentioned.

Dr. Saleema Panda Ma'am, I have a few doubts regarding the design presented in the video. BM you considered for design of vertical walls and main reinforcement placement. You have idealized the vertical walls to be a propped cantilever, right and calculated the BM also using same idealizations. Then the main reinforcements should also be in vertical direction rather than in horizontal direction.

Here, L/B = 11.35/5 = 2.27 > 2. Hence, Long walls will act as cantilever throughout 2.8m. For short walls, first 1 m will act as cantilever, the remaining 2.85 - 1 = 1.85 m will act as slab fixed supported between long walls. Also long walls will be subjected to axial tension + Moment and axial compression + moment. Similarly short walls above 1 m will also be subjected to BM + Axial Tension and BM + Axial Compression. Normally the underground tanks are designed for (i) Tank empty + soil outside and (ii) tank full + no soil outside as two critical conditions. Sometimes, we need to consider soil outside as saturated condition also. Additionally, in this case you have taken wl^2/15 as maximum moment. We need to also provide the reinforcement for wl^2/33.5 as it is having an opposite direction BM.

During design of wall thickness Gravity load is not considered??

Why in the minimum reinforcement of cracks fy multiply into 0.87 madam

Your explanation is good, Can you explain code book reference formulas in detail wise

Can i get the pdf of the above design? Thank you in advance

Dear madam please help me out in underground water tank bottom slab, Main bar or Distribution bar come in long span or span.

its very good and clear.Thanks Madam

Nice sharing. Could you share the same case for horizontal cylinders tank as per UL58? Thanks.

For u should write formulas and then substituting the values then we can easily....

Very nice explanation 👌👌👌👌

Hi, Mu=0.87*fy*Ast*d(1-(fy*Ast)/(fck*b*d)) Right?. Why is 0.42/0.36 multiplied with (fy*Ast)/(fck*b*d)?

Upward force calculations not explained. Weight of base slab not explained fully

can u share this pdf and from which book the reference u have taken mam

Mam, can you provide the reference names or material book for the given type of problem?

Mam this method is WSM

Ma'am some people will say that sump tanks will be designed by working stress method.but you had done design by limit state method. Can u please describe and show the detailing part of sump tank so it can help us Thank you ma'am

shouldn't the percentage of minimum reinforcement be 0.12 % ?

uplift pressure you multiplied by the length and how come its a upword pressure

bhai isko limot state method se krke bta do

Thank you for sharing

what code are you using, Ma'am?

Hello mam Good evening Thank you for this video this is very useful but i had few doubts can you please help 1. How did you got 160000 as weight of soil 2. How you gots that angel i mean as per real base example And 3 you didn't talked-about hunch bar 4 which code should follow to understand reinforcement detailing of underground water tank thank you

Hey..thanks for sharing your knowledge...have a few queries...is there an email.id i can send it on

Please share this pdf file if possible

Steel grade 415 use of 0 .12% steel Fe 250 0.35%

Thanks

if the top and bottom hinged in an underground rectangular tank

Or LSM

Maam, thankyou for the ldesign lecture. And how to derive the equation of bending moment for propped cantilever with triangular load ?... if you can kindly send me any reference...