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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