Hi
I have a tunnel structure resting on clay material. The stiffness of the clay material changes as the tunnel is loaded and unloaded through varying construction stages.
In order to avoid having, literally, thousands of different clay materials, I want to change the stiffness of the soil groups using the CGRP feature allowing me change the “factor for stiffness of group” (Chapter 3.17 in the the TALPA manual).
I’m experiencing some issues with this process though and have a few questions I hope answered:
- In the table, the Item is called “FAKS”, but looking through the examples and the manual I find now other references to FAKS, as such I assume this is a mistake, and the actual item should be “FACS”?
At least I’ve managed to apply the factor as:
.
CGRP NO 171+#i ACT MODI FACS #E_Factor(#i)
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The next issue I face is that I apparently can’t apply factors larger than 1.00, is that correct? If so, why?
For now I’m using a workaround where I factor all stiffnesses based on the maximum value, as such, all factors are between 0 and 1, but It’s not terribly intuitive. -
Is the factor based the stiffness in the previous construction stages, or on the initial stiffness? Meaning, If I apply CGRP NO 1 ACT MODI FACS 0.5 in CS 1 and CGRP NO 1 ACT MODI FACS 0.2 in CS 2. Does this amount to a stiffness factor of 0.5*0.2 = 0.1 or does the factor in CS 2 overwrite CS 1 such that the stiffness factor = 0.2?