Concept
w_{L}= Live load
w_{d} = Dead load
As per Table 12 of IS-456:2000, the bending moment coefficients for dead and live load are given below:
Location |
BM Coefficients for dead load |
BM Coefficients for Live load |
Bending moment |
Middle of end span |
1/12 |
1/10 |
\(\left( {\frac{{{w_l}}}{{10}} + \frac{{{w_d}}}{{12}}} \right){L^2}\) |
Interior support of end span |
-1/10 |
-1/9 |
\(-\left( {\frac{{{w_l}}}{9} + \frac{{{w_d}}}{{10}}} \right){L^2}\) |
Middle of intermediate span |
1/16 |
1/12 |
\(\left( {\frac{{{w_l}}}{{12}} + \frac{{{w_d}}}{{16}}} \right){L^2}\) |
Interior support of intermediate span |
-1/12 |
-1/9 |
\(-\left( {\frac{{{w_l}}}{9} + \frac{{{w_d}}}{{12}}} \right){L^2}\) |
∴ Option 1 is correct