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Hello everyone, I am using “parfor” (parallel for loop) in matlab to analyze a large number of OpenSees file, simultaneously. This dramatically decreases the time and CPU usage. Unfortunately, I have a problem with loading data under this loop. I can’t use "load" or other commands for read...

Hi everyone,

Any idea on this issue? I appreciate any comment.

Thanks,
Vaghefi

Dear Soheil, Thanks a lot for the clear and worth information. Fortunately, the problem was solved. You are right, both horizontal and vertical springs should be used in the model; and so I did. The main and simple point that I understood after try and error was that the amount of “Crad” or “C” as t...

Hi, The response of a SDOF system under horizontal excitation depends on period and damping of structure. This means that if the height and mass of the structure changes so that period and damping remains constant, the response should be constant. When the system is under seismic record having norma...

Hi, Any idea on the problem mentioned in my posts? This is the script of the second case (i.e. using QzSimple & Py materials). In this script, radiation damping (CradSoil) is assumed 0.05. You can try other amounts and see that the responses don't change under horizontal excitation! This is the ...

Thanks indeed for your response. Firstly, I apologize for the long passage. In the first case, when I use elastic materials with parallel vertical dashpots, a rigid tensionless spring (ENT material) is also used in series with each pair of vertical spring–damper to allow foundation uplift. The sway ...

Thanks a lot for your reply. The model is subjected to horizontal seismic excitation. You said that if only horizontal waves hit springs, we should not see any damping. You are right; I changed excitation and saw that responses change with changing Crad. But my problem has not been solved yet. I sho...

Hi, I have built a model of soil-structure allowed to uplift using QzSimple1 material for soil elements. Unexpectedly, changing radiation damping ratio (i.e. Crad) as the input of this material, doesn't affect the responses! Does this mean that QzSimple1 material does'nt consider the radiation dampi...