3DEC → Options → Damping
I am running “; Block under gravity - 3 critically damped cases”.
I want to use “block mech damp rayleigh stiffness” in my model. When I try the different block size I got different result as I predict. I change the upper block to a smaller block and the frequency seems not good(fig1) as shown in the example(fig2). Is there any suggestion to make it like the one in example?
fig1
fig2
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Here is my code:
model new
model config dynamic
model large-strain on
block create brick 0 10 0 1 0 5
block create brick 3 7 0 1 5 10
block cut j-set or 0 0 5
block fix range pos-z 0 5
model grav 0 0 -10
block prop dens 1000
block contact gen-sub
block contact jmodel assign mohr
block contact property stiffness-normal 5e7 stiffness-shear 5e7
block contact material-table default property stiffness-normal 5e7 …
stiffness-shear 5e7
block mechanical damp rayleigh 0 0
hist interval 1
block his vel-z pos 5 0 10
block his disp-z pos 5 0 10
model his dynamic time-total
;no damping
model solve time 1
model title "Vertical displacement v time (undamped)
ret