Which of the following is the effective width of the flange of a monolithic L-beam where l0 is distance between points of zero moment, Df is depth of flange, bw width of web, bf effective width of flange, b is actual width of flange?
1
\(\rm b_f = \frac{l_0}{\frac{l_0}{b} + 4 } + b_w\)
2
\(\rm b_f = \frac{2l_0}{\frac{l_0}{b} + 4 } + b_w\)
3
\(\rm b_f = \frac{l_0}{12 }+ b_w + 3 D_f\)
4
\(\rm b_f = \frac{l_0}{6 }+ b_w + 6D_f\)