A steel chimney is 28 m high, 1.4 m external diameter, and 20 mm thick. It is rigidly fixed at the base and is acted upon by a horizontal wind pressure of intensity 1.1 kN/m2 on the projected area. 2
The chimney weighs 74 kN per metre of height. Calculate the maximum stress in the chimney at the base.
The Attempt at a Solution
total chimney weight = 74kN x 28 = 2072kN
bending moment due to wind pressure = 1/2 x 28^2 x 1100 = 341.2kN/m^2
How am I meant to add the forces when they are incompatible units?
Also do I use the formula, stress = Force/area or stress = My/I?