What is the role of Q and the source of moments in eccentric loading problems?

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SUMMARY

The discussion focuses on the calculation of stresses at point B in the context of eccentric loading problems, specifically addressing the role of Q and the source of moments. It clarifies that Q represents the axial force, which does not induce bending stresses but rather normal stresses at point B, calculated using the formula σx = My*z/Iy. The confusion regarding the coordinates y and z is resolved, confirming they correspond to the specific coordinates of point B. Additionally, the discussion emphasizes the importance of understanding how the section is anchored to prevent movement due to axial forces.

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Homework Statement
Stresses at a point in the crossection due to an axial load in the centroid.
Relevant Equations
Swain formula
1704966420313.png
1704966433531.png

If there is an axial load on G the centroid and i want to calculate the stresses at point B , I will calculate the moments at point B then use the stress formula. I am confused as to what y and z is in this case. I know that y and z are the coordinates of the point that i want to calculate the stress at. Is it the same as zB and yB?
 
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How is the section anchored or restricted from movement induced by that axial force along the x axis?
What is Q representing?
What is the source of those moments?
 
Lnewqban said:
How is the section anchored or restricted from movement induced by that axial force along the x axis?
What is Q representing?
What is the source of those moments?
1705041937307.png

For some reason i thought it's an eccentric loading problem but it's just σx=My*z/Iy due to P. Q axial force should not produce bending stresses only normal at point B of crossection.
 

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