Client
S1
Design Of Two-way Restrained Slab (IS456:2000)
Slab Group
1 Concrete Strength (fck)
2 Reinforcement Strength (fy)
3 Asuumed Over all Thickness of slab
4 Clear Cover
5 Length along X-dir (SHORT SPAN)( Lx)
6 Length along Y-dir (LONG SPAN)(Ly)
7 x (Put for + or - Moments)
8 y (Put for + or - Moments)
9 Dead load (KN/m2)
10 Live load (KN/m2)
Effective Depth of Slab
11 Adopted effective depth
20 Mpa
415 Mpa
125 mm
20 mm
4m
4.7 m
0.058
0.047
5.75 KN/m2
2 KN/m2
mm
Suggestion
CHECK For
[1] or [0]
125,150.175,200
20,25,30
Check for effective depth
Revision
1= ok
1
0=fail,increse depth of slab
(IS456-2000;C 24.2;C37.1.2) ANNEX-D Table26;C D1 and C24.4.1
(IS456-2000;C 24.2;C37.1.2) ANNEX-D Table26;C D1 and C24.4.2
64
105 mm
1= ok
Check for spacing of bars
along SHORT span
(Middle Strip)
Spacing of bar (SHORT) Middle Strip
13 Adopt Spacing of bar (SHORT SPAN)
14 Used bar (SHORT)
125 mm
10 mm
128 mm or less
Check for spacing of bars
along LONG span (Middle
Strip)
150 mm
8 mm
300 mm
8 mm
1
0=fail,increase bar dia or
decrease spacing along
short span
1= ok
175 mm or Less
Check for spacing of bars
along ANY span (Column
Strip)
2. Reinforcement in Edge (COLUMN) strip
17 Adopt Spacing (ANY SPAN)
18 Used bar *ANY SPAN++
0=fail,increase bar dia or
decrease spacing along
short span
1= ok
8,10,12,16
Spacing of bars in 1 meter strip [LONG] Span,Middle Strip
15 Adopt Spacing (LONG SPAN)
16 Used bar *LONG+ Span
1
0=fail,increase bar dia or
decrease spacing along
short span
399 mm or less
8,10,12
3. Curtailment upto distance from CENTREof SUPPORT
1= ok
19 Along short span
500 mm
Check for curtailment
411 Length
20 Along long Span
500 mm
481
1
1 length
0=fail,increase curtailment
4. Check For Shear at Short Edges
Thickness factor (k) for shear strength of
21 Slab
22
23 Permissible shear stress in concrete
Increased Shear strength of concrete due
to slab action
1= ok
1.3
1.3 for slab up to
150mm overal
thickness
Check for Shear criterion
125 mm of Slab have k=
0.25 N/mm2 Percent Tension steel (Pt)
= 100As/bd
0.325 N/mm2
Concrete Mpa
6. Corner Reinforcement for Torsion
Slab-
Torsion reinforcements need not be provided at
any comer contained by edges over both of which
the slab is continuous.
IS456:2000,Annex D
D1.9 page 90
0=fail,increase bar dia or
thickness of slab
1.3 IS456-2000;Annex-B;Clause B5.2.1.1;page 85
0.32 %
20 MPA
S1
Corner Type-I, {2-open,2-close}
Corner Type-II, {1-open,3-close}
Corner Type-III, {0-open,4-close}
Type-I
number of layers
4
Reinforcement area required
numbers of 8 mm
bars per layer ( only
extra 2-layers)
spacing (mm)
Code IS456:2000
annex D
D1.8
Reinforcement area required
along X
461 mm2
along Y
215 mm2
Length extension from edge and paralle to edge
along X
800 mm
along Y
800 mm
D1.8
87 (= 0.75*Atx)
186 (= 0.75*Aty)
9
4
min 100 mm and maximum
150mm (in general)
Type-II
numbers of 8 mm
number of layers
bars per layer
spacing (mm)
Reinforcement area required
along X
230 mm2
5
along Y
107 mm2
2
Length extension from edge
along X
800 mm
along Y
800 mm
Code IS456:2000
annex D
D1.9
174
373
min 150 mm and maximum
200 mm (in general)
Type-II
numbers of 8 mm
number of layers
bars per layer
Reinforcement area required
along X
0 mm2
along Y
0 mm2
Length extension from edge
along X
0 mm
along Y
0 mm
Bottom bar continuity (Not reqd at the
support side upto distance) X-dir (mm)
Continuous side of Slab
1000
Terminating side of Slab
600
Code IS456:2000
annex D
D1.10
spacing (mm)
0
0
0
0
0
0
0
0
Code IS456:2000 annex D ,
D1.4
Y-dir (mm)
1175
705
Tension(negative
moment)reinforcement at support
Continuous edge
Code IS456:2000
Reinforcement area required numbers( not less than)spacing (not more than) annex D, D1.5
along X
307 mm2
4
153
along Y
143 mm2
3
247
Length extension from edge
along X
600 mm
along Y
705 mm
Non-Continuous edge
Code IS456:2000
Reinforcement area required numbers( not less than)spacing (not more than) annex D, D1.6
along X
307 mm2
4
102
along Y
143 mm2
3
165
Length extension from edge
along X
400 mm
along Y
470 mm
Percentage of steel(%) At
Concrete
MPA
0.32 Percentage
20
(N/mm2)
of steel(%)
At
20MPA 25MPA
< 0.15
0.18
0.25
0.22
0.5
0.3
0.19
0.23
0.31
30MPA
0.2
0.23
0.31
0.75
1
1.25
1.5
1.75
2
2.25
2.5
0.35
0.39
0.42
0.45
0.47
0.49
0.51
0.51
0.36
0.4
0.43
0.46
0.49
0.51
0.53
0.55
0.37
0.41
0.45
0.48
0.5
0.53
0.55
0.57
2.75
3.00 and
above
0.51
0.51
0.56
0.57
0.58
0.6
For solid slab 'c =kc
Overal Depth Of Slab (mm) 300 or more 275.000
250.000
Factor k
1.00
1.05
1.10
Adopted Overal depth (mm) value of k taken
125.000
1.300 Check right value taken or not
225.000
1.15
200.000
1.20
175.000 150 or less
1.25
1.30
