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7/27/2019 ACI Moment Coeff. for 2-Way Slab
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ACI Moment Coefficients for dead-load positive moments in
slab
Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8 Case
9
l a
l b
Ca.dl 0.036 0.018 0.018 0.027 0.027 0.033 0.027 0.020 0.023
Cb.dl 0.036 0.018 0.027 0.027 0.018 0.027 0.033 0.023 0.020
Ca.dl 0.040 0.020 0.021 0.030 0.028 0.036 0.031 0.022 0.024
Cb.dl 0.033 0.016 0.025 0.024 0.015 0.024 0.031 0.021 0.017
Ca.dl 0.045 0.022 0.025 0.033 0.029 0.039 0.035 0.025 0.026
Cb.dl 0.029 0.014 0.024 0.022 0.013 0.021 0.028 0.019 0.015
Ca.dl 0.050 0.024 0.029 0.036 0.031 0.042 0.040 0.029 0.028
Cb.dl 0.026 0.012 0.022 0.019 0.011 0.017 0.025 0.017 0.013
Ca.dl 0.056 0.026 0.034 0.039 0.032 0.045 0.045 0.032 0.029
Cb.dl 0.023 0.011 0.020 0.016 0.009 0.015 0.022 0.015 0.010
Ca.dl 0.061 0.028 0.040 0.043 0.033 0.048 0.051 0.036 0.031
Cb.dl 0.019 0.009 0.018 0.013 0.007 0.012 0.020 0.013 0.007
Ca.dl 0.068 0.030 0.046 0.046 0.035 0.051 0.058 0.040 0.033
Cb.dl 0.016 0.007 0.016 0.011 0.005 0.009 0.017 0.011 0.006
Ca.dl 0.074 0.032 0.054 0.050 0.063 0.054 0.065 0.044 0.034
Cb.dl 0.013 0.006 0.014 0.009 0.004 0.007 0.014 0.009 0.005
Ca.dl 0.081 0.034 0.062 0.053 0.037 0.056 0.073 0.048 0.036
Cb.dl 0.010 0.004 0.011 0.007 0.003 0.006 0.012 0.007 0.004
Ca.dl 0.088 0.035 0.071 0.056 0.038 0.058 0.081 0.052 0.037
Cb.dl 0.008 0.003 0.009 0.005 0.002 0.004 0.009 0.005 0.003
Ca.dl 0.095 0.037 0.080 0.059 0.039 0.061 0.089 0.056 0.038
Cb.dl 0.006 0.002 0.007 0.004 0.001 0.003 0.007 0.004 0.002
Note: A cross-hatched edge indicates that the slab continues
across, or is
fixed at, the support; an unmarked edge indicates a support at
which
torsional resistance is negligible.
1.00
m =
Ratio
0.95
0.50
0.70
0.65
0.60
0.55
0.90
0.85
0.80
0.75
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ACI Moment Coefficients for live-load positive moments in
slab
Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8
l a
l b
Ca.ll 0.036 0.027 0.027 0.032 0.032 0.035 0.032 0.028
Cb.ll 0.036 0.027 0.032 0.032 0.027 0.032 0.035 0.030
Ca.ll 0.040 0.030 0.031 0.035 0.034 0.038 0.036 0.031
Cb.ll 0.033 0.025 0.029 0.029 0.024 0.029 0.032 0.027
Ca.ll 0.045 0.034 0.035 0.039 0.037 0.042 0.040 0.035
Cb.ll 0.029 0.022 0.027 0.026 0.021 0.025 0.029 0.024
Ca.ll 0.050 0.037 0.040 0.043 0.041 0.046 0.045 0.040
Cb.ll 0.026 0.019 0.024 0.023 0.019 0.022 0.026 0.022
Ca.ll 0.056 0.041 0.045 0.048 0.044 0.051 0.051 0.044
Cb.ll 0.023 0.017 0.022 0.020 0.016 0.019 0.023 0.019
Ca.ll 0.061 0.045 0.051 0.052 0.047 0.055 0.056 0.049
Cb.ll 0.019 0.014 0.019 0.016 0.013 0.016 0.020 0.016
Ca.ll 0.068 0.049 0.057 0.057 0.051 0.060 0.063 0.054
Cb.ll 0.016 0.012 0.016 0.014 0.011 0.013 0.017 0.014
Ca.ll 0.074 0.053 0.064 0.062 0.055 0.064 0.070 0.059
Cb.ll 0.013 0.010 0.014 0.011 0.009 0.010 0.014 0.011
Ca.ll 0.081 0.058 0.071 0.067 0.059 0.068 0.077 0.065
Cb.ll
0.010 0.007 0.011 0.009 0.007 0.008 0.011 0.009
Ca.ll 0.088 0.062 0.080 0.072 0.063 0.073 0.085 0.070
Cb.ll 0.008 0.006 0.009 0.007 0.005 0.006 0.009 0.007
Ca.ll 0.095 0.066 0.088 0.077 0.067 0.078 0.092 0.076
Cb.ll 0.006 0.004 0.007 0.005 0.004 0.005 0.007 0.005
Note: A cross-hatched edge indicates that the slab continues
across, or
fixed at, the support; an unmarked edge indicates a support at
whic
torsional resistance is negligible.
Ratio
m =
1.00
0.95
0.50
0.70
0.65
0.60
0.55
0.90
0.85
0.80
0.75
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7/27/2019 ACI Moment Coeff. for 2-Way Slab
3/5
Case 9
0.030
0.028
0.032
0.025
0.036
0.022
0.039
0.020
0.042
0.017
0.046
0.013
0.050
0.011
0.054
0.009
0.059
0.007
0.063
0.006
0.067
0.004
is
h
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7/27/2019 ACI Moment Coeff. for 2-Way Slab
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ACI Moment Coefficients for negative moments in slab(for
middle
Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8
l a
l b
Ca.ll 0.045 0.050 0.075 0.071 0.033
Cb.ll 0.045 0.076 0.050 0.071 0.061
Ca.ll 0.050 0.055 0.079 0.075 0.038
Cb.ll 0.041 0.072 0.045 0.067 0.056
Ca.ll 0.055 0.060 0.080 0.079 0.043
Cb.ll 0.037 0.070 0.040 0.062 0.052
Ca.ll 0.060 0.066 0.082 0.083 0.049
Cb.ll 0.031 0.065 0.034 0.057 0.046
Ca.ll 0.065 0.071 0.083 0.086 0.055
Cb.ll 0.027 0.061 0.029 0.051 0.041
Ca.ll 0.069 0.076 0.085 0.088 0.061
Cb.ll 0.022 0.056 0.024 0.044 0.036
Ca.ll 0.074 0.081 0.086 0.091 0.068
Cb.ll 0.017 0.050 0.019 0.038 0.029
Ca.ll 0.077 0.085 0.087 0.093 0.074
Cb.ll 0.040 0.043 0.015 0.031 0.024
Ca.ll 0.081 0.089 0.088 0.095 0.080
Cb.ll
0.010 0.035 0.011 0.024 0.018
Ca.ll 0.084 0.092 0.089 0.096 0.085
Cb.ll 0.007 0.028 0.008 0.019 0.014
Ca.ll 0.086 0.094 0.090 0.097 0.089
Cb.ll 0.006 0.022 0.006 0.014 0.010
Note: A cross-hatched edge indicates that the slab continues
across, or
fixed at, the support; an unmarked edge indicates a support at
whic
torsional resistance is negligible.
0.80
0.75
0.50
0.70
0.65
0.60
0.55
Ratio
m =
1.00
0.95
0.90
0.85
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7/27/2019 ACI Moment Coeff. for 2-Way Slab
5/5
trip)
Case 9
0.061
0.033
0.065
0.029
0.068
0.025
0.072
0.021
0.075
0.017
0.078
0.014
0.081
0.011
0.083
0.008
0.085
0.006
0.086
0.005
0.088
0.003
is
h
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