EXAMPLE $3\mathrm{.}1($ESTIMATING THE DEAD LOAD ON A BEAM$)$

Determine the dead load on beam $A$ of Figure $3\mathrm{.}29,$ where each $($wood$)$ beam is $4in.16$ in$.$ in cross section and is spaced $6$ ft on center. The $($wood$)$ floor planks are $2\frac{1}{2}$ in$.$ thick. Assume that the density of wood is $40l\frac{b}{f}{t}^3($pcf$).$