- #1

steve321

- 25

- 0

## Homework Statement

hi, I'm new to this and am trying to understand axial stress. here's the question I've been given:

"consider the 250mm x 250mm concrete-encased steel column, shown above (picture a square with an H-shaped steel beam in it). the steel section is W150 x 22, with Es = 200,000 MPa and a cross sectional area of 2850 mm2, and is centered in the column. the concrete has Ec = 25,000 MPa. The column is subjected to a concentric axial load of 362kN. What is the axial stress is the steel section?

## Homework Equations

well, from the internet so far I've found fa = Pc / A, where 'fa' is the axial stress, 'Pc' is the compressive force, and 'A' is the cross sectional area. so i guess what I'm looking for is the compressive force, since i have the cross sectional area. also it says that 'fa' is expressed in ksi, which is a unit I'm not familiar with. is that the same as psi?

'E' i think is the modulus of elasticity, something I'm reading up on right now. I've found the equation E= f/e which will help me turn the modulus of elasticity into stress (f) and strain (e), but I'm not sure if either of those help me get to compressive force.

is the compressive force 362kn? I'm guessing it'll be in Newtons or Kn. if this is the case, why are they throwing in all those numbers with the concrete? do i have to find out how much of this force the concrete is taking, and then subtract that from the overall force to find out how much the steel is being stressed?

thanks for your help. I've asked my teacher for a handful of questions that should help me get ready for the exam, and i really want to understand each one so that i can apply it to whatever's thrown my way.