Cyclic Point Load

[diarmaidmeagher]

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]

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

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

[diarmaidmeagher]

Thank you that is a huge help!!