Cyclic Point Load

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diarmaidmeagher
Posts: 5
Joined: Sun Oct 18, 2020 1:39 pm

Cyclic Point Load

Post by diarmaidmeagher » Wed May 19, 2021 4:54 am

Hi all,
I was hoping someone here might be able to point me in the right direction with a problem I am having on OpenSees. I am currently trying to use OpenSees to model and assess the dynamic response of a stadium to human induced vibration (ie if people at a rock concert are jumping up and down in sync). I am starting off by modelling a single person standing on a simple portal frame and jumping up and down, and therefore applying a sin wave type force to the beam. Has anyone ever completed something similar to this or be able to point me in the right direction? I am currently able to apply the sin wave acceleration file to the fixed supports of the portal frame but I cannot seem to apply the forcing function to a location that is not a fixed support.

Any help would be greatly appreciated!

Diarmaid

mhscott
Posts: 868
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
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Re: Cyclic Point Load

Post by mhscott » Wed May 19, 2021 5:38 am

You can assign a sine time series to a nodal load.

timeSeries Sine tsTag ...
pattern Plain 1 $tsTag {
load nodeTag ...
}

diarmaidmeagher
Posts: 5
Joined: Sun Oct 18, 2020 1:39 pm

Re: Cyclic Point Load

Post by diarmaidmeagher » Fri May 21, 2021 3:11 am

Thank you that is a huge help!!

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