pattern UniformExcitation

[luismir]

Hi,

I want to apply a cyclic shear stress with an amplitude of 70kPa to a simple 1 element model. How should I do that?
I tried using:
pattern UniformExcitation 1 1 -accel "Sine 0 1000 $period -factor 35" with shear stress instead of accel but it isn't possible.

Thank you

[fmk]

that will work if you have some mass at the node, -ma is the force applied. just do not use a transient analysis.

alternativily create a plain load pattern with that time series and a unit load in dirn you want it applied, e.g. if at node 2 in 1 dof dirn in 3d model:

timeSeries Trig 1 0 1000. $period -factor 35
pattern Plain 1 1 {
load 2 1.0 0.0 0.0
}

[luismir]

Hi, I'm using a transient analysis, so I'll just create a plain load pattern as you say and divide it by the 2 free nodes of the 4 node element.

Thanks for your help