What is the required thickness t of the steel plates

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Saeed Moaveni
Chapter7: Length And Length-related Variables In Engineering
Section: Chapter Questions
Problem 42P
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A simple beam of length L = 3.2m is subjected to a uniform load of 70 kN/m. The beam (see figure), made up of wood flanges and steel side plates, has the ff dimensions: wood flanges 75mm x 100 mm, and steel plates are 300 mm deep. Take the moduli of elasticity for the steel and wood to be 210 GPa and 10 GPa, respectively. 

What is the required thickness t of the steel plates if the allowable stresses are 120 MPa for the steel and 6.5MPa for the wood? Hint: transform steel into wood(Express your answer in mm, up to 1 decimal place)

75 mm
300 mm
75 mm
100 mm
Transcribed Image Text:75 mm 300 mm 75 mm 100 mm
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