A preliminary design on the use of a simply
Chapter 5, Problem 5.132(choose chapter or problem)
A preliminary design on the use of a simply supportedprismatic timber beam indicated that a beam with a rectangularcross section 50 mm wide and 200 mm deep would be requiredto safely support the load shown in part a of the figure. It was thendecided to replace that beam with a built-up beam obtained by gluingtogether, as shown in part b of the figure, four pieces of the sametimber as the original beam and of 50 3 50-mm cross section. Determinethe length l of the two outer pieces of timber that will yieldthe same factor of safety as the original design.
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