What are all the stress components in this chimney? For masonry, what stress is important?

1. What are all the stress components in this chimney? For masonry, what stress is important?

2. Already talked about multiple stresses at a point: • Beams – get both shear stress and normal stress • Pressure vessels – get two normal stresses • Now look at stresses at a point due to combined loading. Procedure: • Must decide where the critical point is (i.e. where does maximum stress occur?) • Cut the member at that point and solve for internal forces • Determine stresses from these internal forces • Add “like stresses, i.e.: • stotal = s1 + s2 + s3 + ….……….. • ttotal = t1 + t2 + t3 + …………… • Summarize these stresses on a stress element – called alligned stress element or initial stress element.

3. 1. Decide what point to look at 2. Section and solve for internal forces

4. 3. Solve for stresses – add “like” stresses: 4. Summarize stresses on an initial stress element:

5. Where would you analyze these structures if interested in max stress?

6. EXAMPLES: