Pushover curve when only non-linearity is from Link elements
Posted: 23 Feb 2018, 08:10
Hello,
I have modelled a prefabricated modular building in seismostruct. In this study, my assumption is that the Prefabricated Modules are rigid bodies and the conncetions between these modules are flexible. So, I have modelled the Modules using elfrm element and then added separate rigid diaphragms in XZ plane so that the Modules will behave as rigid bodies. I have used Trilinear symmetric link element to represent the Non-linear connection between the Modules.(Its' like rigid squares connected by links at four corners)
The model is perfectly fine in everything like the period(Eigenvalue analysis), modal mass participation factors and it runs very well in static and Non-linear time history analysis as well.
But my problem is, when i conducted a pushover analysis, it gives me a straight line pushover curve. It seems that neither Non-linearity of the link is taken into account, Nor the geometric Non-linearity get's activated. Could anyone of you please clarify me the reason? is it that, seismostructs Geometric Non-Linearity gets activated only if the frames are non-linear? is it not something natural when the links displace and the Geometric Non-linearity occurs? why am i seeing a linear pushover curve?
https://www.dropbox.com/s/2ilzzwzua5i3o ... n.srf?dl=0 I have my model uploaded here. any comments appreciated, Thanks in advance
I have modelled a prefabricated modular building in seismostruct. In this study, my assumption is that the Prefabricated Modules are rigid bodies and the conncetions between these modules are flexible. So, I have modelled the Modules using elfrm element and then added separate rigid diaphragms in XZ plane so that the Modules will behave as rigid bodies. I have used Trilinear symmetric link element to represent the Non-linear connection between the Modules.(Its' like rigid squares connected by links at four corners)
The model is perfectly fine in everything like the period(Eigenvalue analysis), modal mass participation factors and it runs very well in static and Non-linear time history analysis as well.
But my problem is, when i conducted a pushover analysis, it gives me a straight line pushover curve. It seems that neither Non-linearity of the link is taken into account, Nor the geometric Non-linearity get's activated. Could anyone of you please clarify me the reason? is it that, seismostructs Geometric Non-Linearity gets activated only if the frames are non-linear? is it not something natural when the links displace and the Geometric Non-linearity occurs? why am i seeing a linear pushover curve?
https://www.dropbox.com/s/2ilzzwzua5i3o ... n.srf?dl=0 I have my model uploaded here. any comments appreciated, Thanks in advance