Vibration analysis and verification in RSA

[EnricoCorvaglia]

Hi everyone.

I'm designing a rectangular steel tank with RSA in accordance to AISC (or EC), client ask me a verification against vibration due to dynamic load of a mixer on the top of the tank.

This mixer is mounted on 2 shape welded on the top of the tank. It rotate in velocity range of 17-87 rpm generating dynamic force and moments about of 50 kg / 30 kgm.

I found a lot of material and codes on footfall but not on cases of little concentrated dynamic load on structure.

Can someone help me?

Many thank to who can/want helps me

[Krzysztof_Wasik]

Hi @EnricoCorvaglia 

This effect can be simulated using time history analysis. Nice example here

Simplified solution using harmonic analysis can be used as well 

[EnricoCorvaglia]

thank you for your reply, the problem is that I have no idea what with I have to confront the obtained results.

do you have anys suggests?
do you know any codes for this kind of analysis?

[Krzysztof_Wasik · Accepted solution]

Hi @EnricoCorvaglia 

Dynamic loads results in internal forces distribution. Extremal force values can be used for design. There are some rules for dynamic actions in Eurocode 1 - Actions on structures - Part 3: Actions induced by
cranes and machinery EN 1991-3