what is the maximum span for a 4ply 2x8 built up floor beam supporting 2 floors in a 19'8 wide homes
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Breanna O.
The joists of a floor in a warehouse are to be selected using square timber beams made of oak. If each beam is to be designed to carry $90 \mathrm{lb} / \mathrm{ft}$ over a simply supported span of $25 \mathrm{ft}$, determine the dimension $a$ of its square cross section to the nearest $\frac{1}{4}$ in. The allowable bending stress is $\sigma_{\text {allow }}=4.5 \mathrm{ksi}$ and the allowable shear stress is $\tau_{\text {ples }}=125$ psi.
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