Maximum shear acting on a point

[fonseh]

Homework Statement

Why we need to consider only 3 cases when we want to find the max positive shear ?

Homework Equations

The Attempt at a Solution

IMO , We know that the max shear will only occur when the 67.5kN act on B , am i right ? There is no need to consider 3 different cases ...Or my concept is incorrect ? If so , can anyone show me the example where the max shear will occur at B although the max concentrated load doesn't act on the particular point ?

 

[fonseh]

Update : Why the max shear will only occur at B when the certain load act on it ? Can someone explain about it ?

 

[fonseh]

@Chestermiller , can you help ? I think you are the only one in this forum who knows soil mechanics

 

[Chestermiller]

This is not a soil mechanics problem. It is a beam problem.

 

[fonseh]

This is not a soil mechanics problem. It is a beam problem.

sorry , wrong thread