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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 :: Civil-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
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 ?    407 Yes 94 No
Md Gulam Moinuddin
 
Answer
# 2
For Tender purpose, just take valume of RCC conc.X 110 =
steel in rcc
 
Is This Answer Correct ?    421 Yes 173 No
Mahendra Gaikwad
 
 
 
Answer
# 3
Ast=0.5fck/fy(1-(1-4.6Mu/fck.b.d.d))bd 
Is This Answer Correct ?    202 Yes 87 No
Shashwati Nag
 
Answer
# 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 ?    156 Yes 50 No
K.srinivasa Rao
 
Answer
# 5
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
3. Load
Consider 1m width of the slab and find out the total udl
a) W = (Self weight + Live Load + Floor finish)
b) Find factor load
Wu = 1.5 * w
4. Factor bending moment
Mu = Wu * l/8
5. Equating Mu limit to Mu find the depth req. if it is
less thand than O.K otherwise
Increase D & repeat 2, 3, and 4
Mulimit = Mu
6. Area of main steel
Pt = 50fck/fy (1-√1 4.6 Mu / fck bd)
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) v = V/bd
b) Pt Zc
c) Zv < Zc .. No shear reinforcement req.
 
Is This Answer Correct ?    86 Yes 21 No
Aanand Babasaheb Chougule
 
Answer
# 6
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 ?    88 Yes 28 No
Hemant Gor
 
Answer
# 7
ast = ( M ) / (.87*fy*(d-.42*xu)) 
Is This Answer Correct ?    71 Yes 27 No
Shafiullah
 
Answer
# 8
Ast=(0.5Fck/Fy) into(1-(in sqrt(1-((4.6Mu)/Fck.bd^2))into bd
Fck=grade of cement i.e M25, M20
Fy=grade of steel i.e.Fe415,Fe250
Mu=moment
b=width
d=depth
 
Is This Answer Correct ?    66 Yes 24 No
Vinesh
 
Answer
# 9
It depends on type of loading on the slab
normally we go for ly/lx ratio after to find out one or two
way slab
depending on the loading condition u can find out IS
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 ?    51 Yes 16 No
Devendran Chandrasekar
 
Answer
# 10
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
what is ur liveload , dead load , seismic condition and
factor of safety
then u go to table or manual both will be same or it may be
slightly different
dont ask basic questions
 
Is This Answer Correct ?    59 Yes 35 No
Devendranchandrasekar
 

 
 
 
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