The beam is constructed from three boards as shown. If each nail can support a shear force of 300 lb, determine the maximum allowable spacing of the nails, s , s’, s” , for regions AB , BC , and CD respectively. Also, if the allowable bending stress is σallow = 1.5 ksi and the allowable shear stress is τallow = 150 psi , determine if it can safely support the load.
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