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ONE WAY CONTINUOUS SLAB
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Design of slab reinforcement :
Member no.
Location LHS support Midspan
RHS Support /
LHS Support for
adjacent span Midspan
Clear Span m 3 3 3 3
Effective Span m 3.09 3.09 3.09 3.09
Slab Width mm 1000 1000 1000 1000
Slab Depth mm 114 114 114 114
Fck Mpa 20 20 20 20
Fy Mpa 415 415 415 415
DL KPa 2.85 2.85 2.85 2.85
SIDL KPa 2 2 2 2
Live load KPa 5 5 5 5
Total load ' w ' kN/m2
9.85 9.85 9.85 9.85
Clear cover mm 20 20 20 20
Effective cover to Astd' mm 24 24 24 24
Effective depth 'd' mm 90 90 90 90
Mbal. kN-m 22 22 22 22
Mu = kN-m 11.8 12.9 14.9 10.3
Remark O.K. O.K. O.K. O.K.
mm2
399 444 522 345
Pt % 0.350 0.390 0.458 0.302
Ast req for flexure bending= mm2
399 444 522 345
Provide Dia. of reinf. mm Y8 Y8 Y8 Y8
@ @ @ @ @
Spacing mm 200c/c 100c/c 100c/c 200c/c
Giving Ast mm2
251 503 503 251
mm2
Unsafe Safe Unsafe Unsafe
Pt provided % 0.28 0.56 0.56 0.28
Shear force kN 19.42 27.39
Shear stress Mpa 0.22 0.00 0.30 0.00
Beta 8.32 4.16 4.16 8.32
Permissible shear stress Mpa 0.38 0.50 0.50 0.38
Remark Safe Safe Safe Safe
Distribution steel mm2
136.8 136.8 136.8 136.8
Provide Dia. of reinf. mm Y8 Y8 Y8 Y8
@ @ @ @ @
Spacing mm 250c/c 250c/c 250c/c 250c/c
Giving Ast mm2
201 201 201 201
Pt provided % 0.18 0.18 0.18 0.18
Safe Safe Safe Safe
Check for deflection: Pt (%) 0.56 0.28
As per IS 456-2000, Clause 23.2.1, fs (N/mm2)
213 330
required depth for serviceability is MF 2 2
S4 S5
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given by dreqd.=Span/(MF*20) dreqd.(mm) 58 58
where, MF is modification factor, Safe Safe
from Fig.4,IS 456-2000 from Pt and fs & 26 26
fs=0.58xfyxAstreqd./Astprovided Continuous Continuous
L/d
ratio
consid
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RHS Support /
LHS Support for
adjacent span Midspan
RHS Support /
LHS Support for
adjacent span Midspan
RHS Support /
LHS Support for
adjacent span
3 3 3 3 3
3.09 3.09 3.09 3.09 3.09
1000 1000 1000 1000 1000
114 114 114 114 114
20 20 20 20 20
415 415 415 415 415
2.85 2.85 2.85 2.85 2.85
2 2 2 2 2
5 5 5 5 5
9.85 9.85 9.85 9.85 9.85
20 20 20 20 20
24 24 24 24 24
90 90 90 90 90
22 22 22 22 22
13.7 10.3 13.7 10.3 13.7
O.K. O.K. O.K. O.K. O.K.
475 345 475 345 475
0.417 0.302 0.417 0.302 0.417
475 345 475 345 475
Y8 Y8 Y8 Y8 Y8
@ @ @ @ @
225c/c 200c/c 225c/c 200c/c 225c/c
223 251 223 251 223
Unsafe Unsafe Unsafe Unsafe Unsafe
0.25 0.28 0.25 0.28 0.25
25.14 25.14 25.14
0.28 0.00 0.28 0.00 0.28
9.36 8.32 9.36 8.32 9.36
0.36 0.38 0.36 0.38 0.36
Safe Safe Safe Safe Safe
136.8 136.8 136.8 136.8 136.8
Y8 Y8 Y8 Y8 Y8
@ @ @ @ @
250c/c 250c/c 250c/c 250c/c 250c/c
201 201 201 201 201
0.18 0.18 0.18 0.18 0.18
Safe Safe Safe Safe Safe
0.28 0.28
330 330
2 2
S5 S5 S4
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58 58
Safe Safe
26 26
Continuous Continuous
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Design of slab reinforcement :
Member no.
Location Midspan
Clear Span m 3.05
Effective Span m 3.14
Slab Width mm 1000
Slab Depth mm 115
Fck Mpa 20
Fy Mpa 415
DL KPa 2.875
SIDL KPa 2
Live load KPa 5
Total load ' w ' kN/m2
9.875
Clear cover mm 20
Effective cover to Astd' mm 25
Effective depth 'd' mm 90
Mbal. kN-m 22
Mu = kN-m 18.3
Remark O.K.
mm2
664
Pt % 0.577
Ast req for flexure bending= mm2
664
Provide Dia. of reinf. mm Y10
@ @
Spacing mm 100c/c
Giving Ast mm2
785
mm2
Safe
Pt provided % 0.87
Shear force kN
Shear stress Mpa 0.00
Beta 2.66
Permissible shear stress Mpa 0.59
Remark Safe
Distribution steel mm2
138
Provide Dia. of reinf. mm Y8
@ @
Spacing mm 250c/c
Giving Ast mm2
201
Pt provided % 0.17
Safe
Check for deflection: Pt (%) 0.87
As per IS 456-2000, Clause 23.2.1, fs (N/mm2)
#REF!
required depth for serviceability is MF 2
\\vboxsrv\conversion_tmp\scratch_2\237139821.xls.ms_office 7/6/2014 12:54 AM
given by dreqd.=Span/(MF*20) dreqd.(mm) 59
where, MF is modification factor, Safe
from Fig.4,IS 456-2000 from Pt and fs & 26
fs=0.58xfyxAstreqd./Astprovided Continuous
L/d
ratio
consid
\\vboxsrv\conversion_tmp\scratch_2\237139821.xls.ms_office 7/6/2014 12:54 AM
