Kelvin-voigt model (parallel spring and dash-pot)

[alirezakharazian]

Dears,

1- I want to model a Kelvin-voight gap model (parallel linear spring and dash-pot and a gap), in order to use it in pounding between 2 adjacent buildings.
if somebody has information to model it please help me.

2- I have another question......regarding to the ElasticPPGap, If I want to model a linear spring (kelvin-voigt) is it possible to define a large value of Fy to model the linearity or not? and then invoke the reyligh damping to define the dash-pot or not? please help me.

3- as in the zero length element we can not use parallel command, can I define 2 material in one direction( I mean one degree of freedom)? (to introduce kelvin-voigt gap model)

Thanks

[alirezakharazian]

No answer??

[fmk]

1. may not work .. the series model would needs to detremine the contribution from each material making up the series, i.e.. if 2 materials u_total = u_1 + u_2 .. if normal materials it can do this, for your model you would want to break u into a a u_static and a u_viscous and determine forces based on U_static and a udot_viscous .. however i don't think it is going to as to calc u_s and u_v it is using the strains and not strain rates.