Rectangular Footing Design | Numerical | Rectangular design problem | isolated rectangular footing
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- čas přidán 21. 03. 2020
- This video explains the steps involved in designing of rectangular footing, detailed steps how to solve a problem on rectangular footing has been shown, also checks for one way shear and two way shear has been explained
The link for the square footing : • Design of footing | Is...
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#rectangularfooting #designoffooting #designofrectangularfooting
best channel in the CZcams for structural engineers thank you sir
Good explanation.
You could think of providing a reinforced pedestal to reduce the impact of shear.
do we have to provide As1 in the shorter direction?
do we have to always use the BOTTOM Reinforcement %(As1) while calculating for concrete shear in 1way shear check?
Hi sir this is my first comment in YT ..great explanation I'm a recent subscriber..all video's r very clear ..in footing series kindly do a numerical on combined footing ..thank you
So nice of you, thanks for appreciating my work, support my channel with your friends, combined footing soon i will upload
Thanks sir for this explanation, Sir which bar should be at bottom or top (for footing jali) .Should short bars be at bottom side and long bars should be above short bars? Is it mandatory ? Position of long bar and short bar depend on depth d and d1. It always depending on sequence of calculation of Ast1 and Ast2. Is it mandatory that As1 should be calculated by max BM (M1u) and Ast2 should be calculated by low value of BM (M2u). Because sequence of calculation of Ast1 and Ast2 decides the position of upper side or lower side of bars due to depth d and d1 . Can we calculate As1 by M2u and As2 by M1u vice versa. In footing reinforcement schedule there is no provision of showing Max BM and sequence of Ast1 and Ast2 calculation then how to decide laying position of short bar or long bar (above or below for same jali as a long bar and short bar) ? Please explain sir.
*THANKS A LOT SIR, I WAS WAITING EAGERLY FOR THIS VIDEO*
This was specially done for you which you had requested, keep supporting and loving like this and share with your friends
@@structuralanalysisanddesign Thank you and stay safe
You too stay safe, next will be coming up with center line method to find out the quantities
@@structuralanalysisanddesign Sir, at 24:50 you did a mistake. 1155 divide by 113 is 10.2 bars, but u answered 12.36 bars. why?
if 10 bars is right, then it is under reinforced, right ? how come the calculation method is wrong ?
S correct
Sir, U explained it very well😍. #Best
Thank you so much, all the best, keep watching and keep supporting us
Sir I think u have to take ultimate load as 600kn itself
Then we will get net pressure as 100kn/m2
Good and neat explanation.... Thank you sir
So nice of you, keep watching
@@structuralanalysisanddesign Many thanks to you for clear teaching and explanations about formula derivations... Please do more videos sir☺
Sure will try to come up with more videos soon
Nice work man
Well done
Clearly explained
Glad you liked it! All the best
Nice way of teaching
Thanks for liking, keep watching and sharing
sir do we have to show how the BM at XX equation comes or just write the equation only
sir for calculating Po we use column load only but here you used the total load.Why?
Hi Bro can you please explain the shoe footing which is eccentric footing where column at edge side.
Best bro
sir, why dont you consider footing design biaxial moments i.e, "mx "and "my" ?
Sir also add a video with design of singly and doubly reinforcement beam. Along with what is balanced reinforcement over reinforcement and under reinforcement section with the graf
Hello Praveen, Design of Singly reinforced beam already i have uploaded and also what is meant by balanced, under reinforced and over reinforced sections, please see the playlist in my channel "RCC", if you dont find it leave here one message il give the link.
Design of Doubly reinforced beam i will do soon
Pls explain about flat slabs design
It is design only by Column Load or Reaction...
How To We Design If there are also Some Bending force is come during Analysis...
Like
Pu 600 KN
Mx 10 KNm
My 25 KNm
Thanks for your Explanation
Superb 😊😊
Thank you sir.....
Sir, it would be so great if you could make a video of design of eccentric loading footing too.
Your request Noted, keep watching and checkout channel membership feature
@@structuralanalysisanddesign ok sir
sir in check for 1 way shear we concluded it as not safe , is it because Tv and Tc value are real close .If Tv = 0.35 and Tc=0.328 then it will be safe , isnt it sir , as there is a good difference here
hi sir for ast2 did u take d1^2?
Foundation size if we make same size we get less rft moment will reduce
Make 4 side same size for construction
cant u make a dedidated vedio on patterns for all types of structures
If ast1
Sir my quedtions
1)is this a confirmed question from 5th unit
2)i can do same method for scoring
3)sir due to covid it caries 14 marks
4) please reply
4
Everyone skip this in rectangular footing area of reinforcement should be calculated two times .i see your video just to verify that
sir how u are taking b/L ratio as 40/60 ,is it practicle ????
sir can u pls upload the eccentric footing design ...
Equal projectons beyond the coloumn are allowed for the design
Bro vertical load lo live load tesukunty same procedure y na bro
Sir make a vedio on combined trapezoidal footing for 02 columns
Sir,
Is it mandatory to provide same diameter bars along both directions or can we use lesser diameter bars(say, 10mm bars) for Ast2?
We can use different diameters
Sir if moment are given in the question on shorter side and longer side then how to calculate
Cant we calculate moment with cantilever formula?
sir ... if you could solve a problems on raft footing...
Sir I have problem in SFD and BMD of frame structure ☹️☹️☹️☹️
In Area Calculations why take B/L = 40/60
This ratio will be taken from column dimensions ?
yes
Sir,for net upward pressure of soil,in some books, they took the live load instead of adding 10% of it for calculating the value,here you add 10% with live load for calculating... now I'm confused sir... please reply
You can go with the steps shown in video.
Sir please upload eccentric footing or corner footing design... it's also much importance now a days
Ya i will be coming up with those videos also, stay tuned for more civil engineering videos, check out my patreon profile
@@structuralanalysisanddesign sir where is this patreon profile
its just like youtube
Sir please make a video series on g+2 building structure .I am waiting for a building design . Thanks #abhijeet sir
sir whats the name to be written for Vx andVux
At 40:06 how do we calculate the value of Fu? Plz explain
sir kindly upload design of combined footing
Example from RCC BC Punmia 🤩🤩
Sir i think you forget to put periphery value in last Two way shear Tv value ... formula is Load/periphery you only took load / Area of punching shear.
sir please make a video oncombined footing
Yes vijay working on it, will be coming up with detailed video
@@structuralanalysisanddesign
thank you so much for your concern sir. i respect you alot. because you made me to understand subject easily. and seriously no faculty had gave clear lecture than you
@@structuralanalysisanddesign
but sir, i have little bit of confusion while taking sections in rectangular footing design. please give me clearance about it
@@structuralanalysisanddesign
thank you sir, please take care
Now a days using fe 500 and 550
How we design what is formulas
Sir , I have Doubt in 7:45 W is equal to Load Given sir , But Why you took 660 , we should take 600 na Sir .
Pls Tell me as soon as possible
660 is 600 + 10% of 600
Please take problem on combined footing
Hello, could you explain where the M1u= 0.138FckBd^2 comes from?
Its in 15.20
Hello Jessica, it is the modified formula of Mulim which is given on Page 96 of IS 456-2000 (G 1.1 (c) Formula) i have substituted (Xumax/d) value and got 0.138Fckbd^d and remember its valid only for Fe415. for Fe 250 and Fe 500 (Xumax/d) is different so you get different Mu value.
I hope i cleared your doubt, keep watching and keep sharing
@@structuralanalysisanddesign Thank you! Your videos are very informative :)
but as per is code depth is governed my shear only, for safe design of footing.... so how is it possible to adopt depth by calculating moment
Then how to calculate Ast without moment we have to assume Ast and then proceed for depth by shear
Take only axial load while u r calculating soil pressure due to column load not total load sir
Please mention which codes used ???? In all ur videos...
And from which code book u took ast formula please let me know
Its a modified version of code book formula, in any standard text book you can find that Ast formula
neelam sharma
For area of steel reinforcement Ast1 I think u made a mistake ... in the root of the formula it is Bd²... so it should be 400² which is equal to 160,000.. can u please clarify if I am wrong
Yes my dear student its BdSqaure and 400square, by mistake i have written only 400 but the answer is correct its done by taking 400sqaure
He calculated with 400 square, he just forgot to put square sign in formular
you can check his calculation is correct.
sir, Ast-2 u have not followed clear spacing rule mentioned in table-15 of IS;456. for 415 steel clear spacing should not be more than 180mm. correct me if I'm wrong.
Check out page number 66 of IS 456-2000, clause 34.5.1, it says as per solid slabs we have to follow and table 15 is for beams, clause 26.3.3 in slabs it says 3 times effective depth or 300mm whichever is smaller.
I hope i cleared you doubt, thanks for watching
@@structuralanalysisanddesign Yes sir, cleared. Thank you. sir plz teach us edge column footing .... No YT channel did that.
Definitely i will try to work out that problem
@@structuralanalysisanddesign sir, for Ast-2 , pt value is less than o.12%. in that case what to do? should provide minimum %?
czcams.com/video/LD03FfyTu1U/video.html
What if they given bi axial load in question?
its wrong 1/2(L-a) its OK 1/2(L-1/2a) please chick this in Geometry.
and your explanation very good.
thanks.
Thanks for the appreciation, ok i will check the geometry
Sir, upward pressure mai to =load on column to total area lai tai hai na
Sir aap total load to total area lai liyai hai,
Sir, if i am wrong then help me sir
Sir,
τv =Nominal shear stress 0.33 N/mm² is Greater than, τc=Design shear stress 0.328N/mm² . Hence it is safe in One way shear. This is been explained in your previous rectangular footing design video.
I have also doubt in this part plz sir clear it
Can anyone tell me about B/L ratio where this came from🤔
for net upward pressure , isnt it we should use factored load?? like 1.5*600
Hello amit, i have not incorporated factored load while calculating upward pressure but if you watch carefully complete video i have factored moment by mutiplying 1.5, its usual practice to use safety factor for moment instead of load
Sir staircase problems upload
It should be (T suffix v) < (T suffix c)
In one way shear
Pu = P/A ( 600/6) = 100Kn/m²
Sir ast1 u in place of dsqure u give n d means instead of 400*400 u given 400
Why you don't check minimum reinforcement in case of ast2.
czcams.com/video/LD03FfyTu1U/video.html
Sir, well presentation. Ast1 > 0.12% but Ast2
Sir, can you reply for this question?
fck means=?
Is it ultimate compressive strees???
sir plz reply
fck is compressive strength of concrete
@@structuralanalysisanddesignultimate or allowable?
In Bangladesh, we use f'
Compressive stress of concrete
Sir, how to calculate the bending moment in square footing for rectangular column ?
Consider critical section length i.e (L-a/2) and BM for cantilever is WL^2/2...
Finaly u wil get Wu(L-a)^2/8
@@praveenmotovlogger98 hi Darla
B.m =po.B*L/8(B-b)^2
But my doubt is how two way shear check for a rectanglurar column squre footing
Sir, why u considered b/l = 40/60
Column
400/600
I need circler footing problem
I will surely try to upload, right now i am focusing on columns
@@structuralanalysisanddesign OK sir
Sir next time please use X-X section in X axis and Y-Y section in Y axis , its really confusing
It depends upon you aayushrjl but still i will consider your suggestion, thanks for watching
Are you same from Build it home channel ? Am I right ?
No Madhvendra, This is my first channel
@@structuralanalysisanddesign don't mind pls thank you your all solutions are so unique & useful for exams ......
I am very happy that my videos are useful for you, this motivates me to come up with more videos, keep supporting and sharing these lectures to your civil engineering friends
why you are not using this formula for Ast calculation Mu=0.87 x fy x Ast d {1-(Ast*fy/(bd*fck))}
I dont use that formula because it becomes tedious to follow that formula, the modified version of Ast formula which i use is very easy to use and apply, please refer Limit State Design of Reinforced Concrete by B.C.Punmia for that theory how the formula is modified, i recommend to use modified version for simplicity, however both formula gives same Ast.
Tq so much sir for giving clarity, I did one footing design with reference of your video that is sq footing and rectangle column I'll send it Plz check sir.....
sure
hand writing not in compliance
Ast 2 is wrong answer sir
design safe eddida mad ri sir 😢😢
circular footing bolo sir. voh kohi thik sey nahi bolrey. plze explain that.
Wrong solution..B value is taken wrong. At Vx it is raken as 2000 and at Tv it is taken as 3000..ive wasted my time looking at this video. Observe from 29th minute. DISAPPOINTED.
Solution is not wrong, at 33:22 i have corrected as 2000, while writing i made mistake but value calculated is correct
How d= 0.4???