How does OpenSees perform dynamic analysis of earthquakes and other dynamic loads at the same time?

[yanghwhit]

When I performed the OpenSees analysis, I found that the seismic action and other dynamic load time history (such as wind load time history and machine vibration load time history) cannot be analyzed at the same time.

How does OpenSees perform dynamic analysis of earthquakes and other dynamic loads at the same time?

Thanks.

[mhscott]

Yes, they can be analyzed at the same time. Define concurrent pairs of load patterns and time series.

[yanghwhit]

Thank you very much for your answer！

[Wangzj]

Hello, Teacher Yang. At present, I also need to solve the same problem as you in the analysis, because I am a beginner, so I am not particularly clear about the above answer. I would like to ask in detail how you solved it.Thank you very much.

[Wangzj]

timeSeries Path 1 -dT 0.1 -filePath w1-10.txt -factor $wfact
pattern plain 2 1 {
load 86914 ......
}
Dear mhscott，Here I have a question，how should I add the wind load（w1-10.txt） to the node（86914） and define the direction in plain patter.Thank you very much.

[fmk]

the file contains the fluctuating values of the wind load in a specific direction. in a pattern you are providing reference loads. the actula load applied at a node at any time is equal to the load factor from the time series (in your case the load you want applied pecified in your file) multipled by the reference load .. so you would place a 1.0 in direction of load and a 0.0 for all other dof directions.

i.e. if want load applied in 1 dof direction load and you have a 6 dof problem:

load 86914 1.0 0.0 0.0 0.0 0.0 0.0

or if you want it applied in 2 dof direction:

load 86914 0.0 1.0 0.0 0.0 0.0 0.0

[Wangzj]

Dear fmk，Thank you very much