Question: 8 - 1 0 5 A 2 0 - ft - long simply supported timber beam is loaded with 1 8 0 0 - lb

8-105 A 20-ft-long simply supported timber beam is loaded with 1800-lb concentrated loads applied 6 ft from each support. The allowable flexural stress is 1900 psi, and the allowable shearing stress is 90 psi. Select the lightest standard structural timber that can be used to support the loading.

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