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7/28/2019 RCC Slab_01
1/9
Thisprogramisconceive
danddevisedbyB.ChandraSekharSDE(P&D)BSNLVisakhapatnam(bcsreddy71
@gmail.com).Usersareadvisedtouseth
isprogramattheirdiscret
STRUCTURAL DESIGN OF RCC SLAB SPANNING BOTH DIRECTIONS AS PER IS 456:2000
Slab panel identification INTERIOR
Shorter span ( lx) 4 Short Edge 1 Continuous
Effective span in
Short Direction 4.500 Short Edge 2 Continuous
Longer span (ly) 6 Long Edge 1 ContinuousEffective span in Longer
direction 6.115 Long Edge 2 Continuous
Factored load 25
[1.5 (DL+LL)]
Total depth of slab (in m) 0.15
Grade of Concrete (fck) M20 Dia of Main Rein. 10
Dia of secondary Rein. 10
Grade of Steel (fy) Fe415
span ratio (ly/lx) = 1.36
As per IS 456 As per Table 26 of IS 456-2000
the type of panel to be considered is
INTERIOR PANELS
ly/lx
upper lmt 1.40 0.05 0.04 0.03 0.02
Lower lmt 1.30 0.05 0.04 0.03 0.02Bending moment coefficient 1.36 #VALUE! #VALUE! 0.03 0.02
Max. Bending moments #VALUE! #VALUE! 16.2 12.2
Max BM for Design = #VALUE! KN-m
Reqd Effective Depth = #VALUE! mm
#VALUE!
Provided effective depth (d) 125 mm #VALUE!
Actual Requirement of steel (in %) #VALUE! #VALUE! #VALUE! #VALUE!
Minimum Requirment (in %) 0.12 0.12 0.12 0.12
Actual Requirment In mm #VALUE! #VALUE! #VALUE! #VALUE!
Spacing as per % of steel reqd. #VALUE! #VALUE! #VALUE! #VALUE!
Max.spacing allowed (3d or
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Case no. Type of Panel and moments considered
1
1 Interior panels Negative moment at continuous edge 0.032 0.032
Positive moment at mid-span 0.024 0.024
2 Negative moment at continuous edge 0.037 0
Positive moment at mid-span 0.028 0
3 Negative moment at continuous edge 0.037 0
Positive moment at mid-span 0.028 0
4 Negative moment at continuous edge 0.047 0
Positive moment at mid-span 0.035 0
5 Negative moment at continuous edge 0.045 0
Positive moment at mid-span 0.035 0
6 Negative moment at continuous edge 0
Positive moment at mid-span 0.035 0
7 Negative moment at continuous edge 0.057 0
Positive moment at mid-span 0.043 0
8 Negative moment at continuous edge 0
Positive moment at mid-span 0.043 0
9 Negative moment at continuous edge 0Positive moment at mid-span 0.056 0
0.032
0.024
Continuous 1
Continuous 1
Continuous 1
Continuous 1
Case if 1 to 8 = Interior panels
Case if 9 =
Hence Final Case = Interior panels
One short edgediscontinuous
One long edgediscontinuous
Two adjacent edgesdiscontinuous
Two short edgesdiscontinuous
Two long edgesdiscontinuous
Three edgesdiscontinuous (one longedge continuous)
Three edgesdiscontinuous (oneshort edge continuous)
Four edges
discontinuous
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1
1.1
1.21.3
1.4
1.5
1.75
2
ly/lx
upper lmt 1.4
Lower lmt 1.3
for 1.358889
Bending moments #VALUE! #VALUE!#VALUE!
#VALUE!
#VALUE!
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Short span coefficients x (Value of ly/lx)
1.1 1.2 1.3 1.4 1.5
0.037 0.037 0.043 0.043 0.047 0.047 0.051 0.051 0.053 0.053
0.028 0.028 0.032 0.032 0.036 0.036 0.039 0.039 0.041 0.041
0.043 0 0.048 0 0.051 0 0.05 0 0.057 0
0.032 0 0.036 0 0.039 0 0.041 0 0.044 0
0.044 0 0.052 0 0.057 0 0.063 0 0.067 0
0.033 0 0.039 0 0.044 0 0.047 0 0.051 0
0.053 0 0.06 0 0.065 0 0.071 0 0.075 0
0.04 0 0.045 0 0.049 0 0.053 0 0.056 0
0.049 0 0.052 0 0.056 0 0.059 0 0.06 0
0.037 0 0.04 0 0.043 0 0.044 0 0.045 0
0 0 0 0 0
0.043 0 0.051 0 0.057 0 0.063 0 0.068 0
0.064 0 0.071 0 0.076 0 0.08 0 0.084 0
0.048 0 0.053 0 0.057 0 0.06 0 0.064 0
0 0 0 0 0
0.051 0 0.059 0 0.065 0 0.071 0 0.076 0
0 0 0 0 00.064 0 0.072 0 0.079 0 0.085 0 0.089 0
0.037 0.043 0.047 0.051 0.053
0.028 0.032 0.036 0.039 0.041
case1= 1
case 2= 0
case 3= 0
Case 4= 0 0 0 0
Case 5 = 0
Case 6 = 0
Case 7 = 0
Case 8 = 0
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Case 9 = 0
Alpha X Alpha Y
-ve +ve -ve +ve
0.032 0.024 0.032 0.024
0.037 0.028
0.043 0.0320.047 0.036
0.051 0.039
0.053 0.041
0.06 0.045
0.065 0.049
0.051 0.039
0.047 0.036
#VALUE! #VALUE! 0.032 0.024
16.2 12.15
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Long span Coeff y
1.75 2 ly/lx
0.06 0.06 0.065 0.065 0.032 0.032
0.045 0.045 0.049 0.049 0.024 0.024
0.064 0 0.068 0 0.037 0
0.048 0 0.052 0 0.028 0
0.077 0 0.085 0 0.037 0
0.059 0 0.065 0 0.028 0
0.084 0 0.091 0 0.047 0
0.063 0 0.069 0 0.035 0
0.065 0 0.069 0 0
0.049 0 0.052 0 0.035 0
0 0 0.045 0
0.08 0 0.088 0 0.035 0
0.091 0 0.097 0 0
0.069 0 0.073 0 0.043 0
0 0 0.057 0
0.087 0 0.096 0 0.043 0
0 0 00.1 0 0.107 0 0.056 0
0.06 0.065 0.032
0.045 0.049 0.024
0
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Mu/bd2 Fe 415
0.3 0.085
0.35 0.09
0.4 0.114
0.45 0.128
0.5 0.143
0.55 0.1580.6 0.172
0.65 0.187
0.7 0.203
0.75 0.218
0.8 0.233
0.85 0.248
0.9 0.264
0.95 0.28
1 0.295
1.05 0.311
1.1 0.327
1.15 0.3431.2 0.359
1.25 0.376
1.3 0.392
1.35 0.409
1.4 0.409
1.45 0.443
1.5 0.46
1.55 0.477
1.6 0.494
1.65 0.512
1.7 0.53
1.75 0.5471.8 0.565
1.85 0.584
1.9 0.602
1.95 0.621
2 0.64
2.02 0.647
2.04 0.655
2.06 0.662
2.08 0.67
2.1 0.678
2.12 0.685
2.14 0.6932.16 0.701
2.18 0.709
2.2 0.717
2.22 0.725
2.24 0.733
2.26 0.741
2.28 0.749
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2.3 0.757
2.32 0.765
2.34 0.773
2.36 0.781
2.38 0.79
2.4 0.798
2.42 0.8062.44 0.814
2.46 0.823
2.48 0.831
2.5 0.84
2.52 0.848
2.54 0.857
2.56 0.866
2.58 0.874
2.6 0.883
2.62 0.892
2.64 0.901
2.66 0.912.68 0.919
2.7 0.928
2.72 0.937
2.74 0.946
2.76 0.955
2.78
2.8
2.82
2.84
2.86
2.88
2.92.92
2.94
2.96
2.98