Support reactions

[proff_king]

Projecting a system of pipes and apparatus. Apparatus vibrate, causes Y axi alternating force 170 kN. How can I set this force and find a reactions in a surface boundary conditions. This is needed for define witch fundament anchor bolts will be used. Inb4 thanks to everybody

[John_Holtz]

Hi Professor,

Does "alternating force" mean that it varies sinusoidally? Force = Amplitude*sine(frequency*time)

If so, this can be analyzed using "Linear > Frequency Response" or "Linear > Transient Stress". If the force is not sinusoidal, then only the Transient Stress analysis type would be applicable.

I suggest doing a small test to get familiar with those analysis types to make sure they will provide the information you are searching for.

[proff_king]

Formula is quite correct. i am using transient stress analysis.

But you don`t answer the rest of my question - Find a reactions in a surface boundary conditions/

There is a boundary conditions where fundament bolt touches supports. How to find a support reaction which came from inertia of mass and varyable force? 

[John_Holtz]

Sorry. I did not realize that the Transient Stress did not output the reaction forces directly.

Replace your boundary conditions with Rigid Boundary Elements (version 2011 and older) or 3D Springs (version 2012 and newer). Fix the directions to product the same effect as the boundary conditions. After running the analysis, you can view the force in the boundary elements/3D springs by viewing the "Element Force" result.

[proff_king]

and what about find moment of reaction?