The compound beam is made from two sections, which are pinned together at \(B\). Use Appendix B and select the lightest-weight wide-flange beam that would be safe for each section if the allowable bending stress is \(\sigma_{\text {allow }}=24 \mathrm{ksi}\) and the allowable shear stress is \(\tau_{\text {allow }}=14 \mathrm{ksi}\). The beam supports a pipe loading of \(1200 \mathrm{lb}\) and \(1800 \mathrm{lb}\) as shown.

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A 1200 lb 1800 lb B -6 ft 6 ft 8 ft- 10 ft-