고체역학 (Beer) — Analysis and Design of Beams for Bending: Problem 5.79

5.79 A steel pipe of 100-mm diameter is to support the loading shown. Knowing that the stock of pipes available has thicknesses varying from 6 to 24 mm in 3-mm increments, and that the allowable normal stress for the steel used is 150 MPa, determine the minimum wall thickness \( t \) that can be used.