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October 15, 2021 at 1:05 pm
peteroznewman
Subscriber
I'm only going to answer the First question. Let's assume that the remote force behavior is set to Rigid. Draw a Free Body Diagram of the two cantilevers and the remote force. Statics demands that the sum of the forces is zero and the sum of the moments is zero.
If the Location of of the upward remote force was exactly half way between the cantilevers, then the Reaction Force is going to be equal and downward.
If the location of the upward remote force was moved along the +X axis a large distance past the +X cantilever so there is a large moment about the Y axis on the structure. Now the Reaction Force on the +X cantilever would be large and downward, while the Reaction Force on the -X cantilever would be large and upward.
I hope this simple example explains why the remote force location affects the Reaction Force on the cantilever system.
If the Location of of the upward remote force was exactly half way between the cantilevers, then the Reaction Force is going to be equal and downward.
If the location of the upward remote force was moved along the +X axis a large distance past the +X cantilever so there is a large moment about the Y axis on the structure. Now the Reaction Force on the +X cantilever would be large and downward, while the Reaction Force on the -X cantilever would be large and upward.
I hope this simple example explains why the remote force location affects the Reaction Force on the cantilever system.
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