Dear Seismosoft team
Thank you so much for very helpful your softwares.Please viscous and viscoelastic dampers models of hysteresis add to SeismoStruct(link element types part).
Best regards
viscous and viscoelastic dampers
Re: viscous and viscoelastic dampers
Hi mohammadzadeh,
Do the current response curves available in SeismoStruct (e.g. bl_ kin, plst, etc.) not already allow you to reproduce typical viscous/viscoelastic hysteresis?
Best,
Rui
Do the current response curves available in SeismoStruct (e.g. bl_ kin, plst, etc.) not already allow you to reproduce typical viscous/viscoelastic hysteresis?
Best,
Rui
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- Posts: 13
- Joined: 12 Apr 2014, 15:32
Re: viscous and viscoelastic dampers
Dear Rui
No, because viscous damper force is dependent on velocity.
F = CV^alpha
F = viscous damper force
C = damping constant
V = velocity
alpha = velocity exponent
Best regards,
Mohammadzadeh
No, because viscous damper force is dependent on velocity.
F = CV^alpha
F = viscous damper force
C = damping constant
V = velocity
alpha = velocity exponent
Best regards,
Mohammadzadeh
Re: viscous and viscoelastic dampers
Mohammadzadeh, hi.
Yes, sure, viscous dampers are obviously dependent on velocity, I appreciate that.
However, what typically happens is that their hysteretic response does not really changes that much within the velocity of ranges that one expects in an earthquake (peak values of 20-30 cm/s), this being the reason why often one pragmatically decides not to model such velocity dependence.
You may perhaps try to define hysteretic curves for your viscous dampers for different (realistic) values of velocity, run different structural analyses for each one of those hysteretic models, and see what sort of impact this has on your overall structural response?
You may also perhaps pay a look at some past posts on this topic (I found them by carrying out a search this Forum using the expression "damper velocity"):
- http://www.seismosoft.com/forum/viewtop ... 918&p=4641
- http://www.seismosoft.com/forum/viewtop ... 915&p=4640
Best,
Rui
Yes, sure, viscous dampers are obviously dependent on velocity, I appreciate that.
However, what typically happens is that their hysteretic response does not really changes that much within the velocity of ranges that one expects in an earthquake (peak values of 20-30 cm/s), this being the reason why often one pragmatically decides not to model such velocity dependence.
You may perhaps try to define hysteretic curves for your viscous dampers for different (realistic) values of velocity, run different structural analyses for each one of those hysteretic models, and see what sort of impact this has on your overall structural response?
You may also perhaps pay a look at some past posts on this topic (I found them by carrying out a search this Forum using the expression "damper velocity"):
- http://www.seismosoft.com/forum/viewtop ... 918&p=4641
- http://www.seismosoft.com/forum/viewtop ... 915&p=4640
Best,
Rui
-
- Posts: 13
- Joined: 12 Apr 2014, 15:32
Re: viscous and viscoelastic dampers
Dear Rui
Current response curves in SeismoStruct may use to define viscous dampers based on approximate simplified methods but for exact(and realstic) hysteretic curves need to velocity dependent hysteretic curves.
Damper exact response is needed in some research(not overall structural response).
I read past posts on this topic.The following video is an experimental study on a large-scale steel structure with nonlinear viscous dampers.
https://www.youtube.com/watch?v=1C8URWbteZM
Best regards,
Mohammadzadeh
Current response curves in SeismoStruct may use to define viscous dampers based on approximate simplified methods but for exact(and realstic) hysteretic curves need to velocity dependent hysteretic curves.
Damper exact response is needed in some research(not overall structural response).
I read past posts on this topic.The following video is an experimental study on a large-scale steel structure with nonlinear viscous dampers.
https://www.youtube.com/watch?v=1C8URWbteZM
Best regards,
Mohammadzadeh
- seismosoft
- Posts: 1192
- Joined: 06 Jul 2007, 04:55
Re: viscous and viscoelastic dampers
Hi mohammadzadeh,
Thank you for your suggestion.
We will consider your request on viscous dampers for inclusion in a future release of SeismoStruct, but unfortunately not in v8, the development of which was completed just last month ( it wll be published in 2-3 months after all the checking and the translations have been carried out).
Regards,
Seismosoft Support
Thank you for your suggestion.
We will consider your request on viscous dampers for inclusion in a future release of SeismoStruct, but unfortunately not in v8, the development of which was completed just last month ( it wll be published in 2-3 months after all the checking and the translations have been carried out).
Regards,
Seismosoft Support
-
- Posts: 13
- Joined: 12 Apr 2014, 15:32
Re: viscous and viscoelastic dampers
Hi Seismosoft
Thank you so much.
Thank you so much.
Re: viscous and viscoelastic dampers
Dear members
could anybody send me a simple model of viscoelastic damper which modeled in seismostruct?
I think I have a problem in modeling of it.
thank you
could anybody send me a simple model of viscoelastic damper which modeled in seismostruct?
I think I have a problem in modeling of it.
thank you
Re: viscous and viscoelastic dampers
Thanks for this valuable information.