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Question
```how to calculate the steel for rcc slab?
plz tell me the formula for calculating the steel?```
Question Submitted By :: Kaleem
I also faced this Question!!     Rank Answer Posted By

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 1
For Tender purpose, just take valume of RCC conc.X 110 =
steel in rcc

 Is This Answer Correct ? 387 Yes 158 No

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 2
there is no general formula for the calculation fo steel
(reinforcement) its depend upon the design of the structur
,for whih load and moment acting on the structure are
considered

 Is This Answer Correct ? 380 Yes 85 No
Md Gulam Moinuddin

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 3
Ast=0.5fck/fy(1-(1-4.6Mu/fck.b.d.d))bd
 Is This Answer Correct ? 193 Yes 83 No
Shashwati Nag

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 4
for calculating the area of steel in rcc slabs,
ast = ( M ) / (.87*fy*(d-.42*xu))
where
M= moment corresponding to entire loads of span in one
meter length
fy= characteristic strength of steel
d= depth of slab
xu=lever arm depth depending upon the type of fy given
in Is:456-2000

 Is This Answer Correct ? 145 Yes 47 No
K.srinivasa Rao

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 5
Two Methods, First from Calculation, 2nd using SP16
1st Method Compute K= Mu/(fcu x b x d^2)
for Fy = 415 if K<= 0.138 Singly Reinforced

Calculate Z/d = 0.5 + sqrt { 0.25 - K/0.865}

Area of Steel = Mu / { 0.87 x fy x Z }
Z is Lever Arm Distance Between CG of Tension and Compression Force

2nd Method
Calculate Mu /{b x d^2}
Check Table 2 to 5 of SP16 based on Concrete Grade
It gives Percentage of Steel Pt for given Grade of Concrete,steel and Mu/{bxd^2}

 Is This Answer Correct ? 84 Yes 28 No
Hemant Gor

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 6
using code book to find out is one method is456-2000
sp16
another method is design of rcc slab by limit state method
u refer any author
u check one way or two slab slab
factor of safety
then u go to table or manual both will be same or it may be
slightly different

 Is This Answer Correct ? 52 Yes 33 No
Devendranchandrasekar

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 7
ast = ( M ) / (.87*fy*(d-.42*xu))
 Is This Answer Correct ? 65 Yes 27 No
Shafiullah

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 8
normally we go for ly/lx ratio after to find out one or two
way slab
456-2000 Code book to
find the rft depends on moment acting on the slab
if it is two way slab provide shear reinforcement on all
four corners
better u can study design of concrete structures in slab
there is
calculation arrived by some model examples
but field condition is difference follow depends on
structural designer
u cannot ask direcly what is the formula for design the slab?
u have to read more book then u know
all...............................
regrds
Devendran
Saif Bin Darwish
Abu Dhabi

 Is This Answer Correct ? 49 Yes 15 No
Devendran Chandrasekar

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 9
Ast=(0.5Fck/Fy) into(1-(in sqrt(1-((4.6Mu)/Fck.bd^2))into bd
Fck=grade of cement i.e M25, M20
Mu=moment
b=width
d=depth

 Is This Answer Correct ? 60 Yes 23 No
Vinesh

Re: how to calculate the steel for rcc slab? plz tell me the formula for calculating the steel?
# 10
Design steps of one way slab
1. Depth of slab
d= lx/20 * M.F. (M.F. = Modification factor)

Assume the dia. of bar (8, 10, 12) and
Final overall depth
D= d+15+0/2
d= d-15-0/2
2. Effective Span
This is taken as the lesser of the followings
a) Center to center distance between followings
L= lx + t
L= lx + d
Consider 1m width of the slab and find out the total udl
a) W = (Self weight + Live Load + Floor finish)
Wu = 1.5 * w
4. Factor bending moment
Mu = Wu * l²/8
5. Equating Mu limit to Mu find the depth req. if it is
less than‘d’ than O.K otherwise
Increase D & repeat 2, 3, and 4
Mulimit = Mu
6. Area of main steel
Pt = 50fck/fy (1-&#8730;1 – 4.6 Mu / fck bd²)
Ast = Pt/100 *100* d
7. Spacing of main steel
S = Area one bar * 1000/ Ast
Check: - a) 3d
b) 450 mm
8. Distribution Steel
Astd = 0.15 % of Ag -Fe 250 (mild)
= 0.12% of Ag – Fe 415/5000 (torque)
Ag = b.D
9. Spacing of distribution steel
S= Area one bar * 1000/ Astd
Check: - a) 5d
b) 450 mm

10. Check for depth
a) Žv = V/bd
b) Pt —› Zc
c) Zv < Zc …….. No shear reinforcement req.

 Is This Answer Correct ? 80 Yes 19 No
Aanand Babasaheb Chougule