Dear sir,
During earthquake, soil liquefaction might be a concern especially when non-liquefied layer is underlying by liquefied soil.
Lateral spreading load due to non-liquefied soil movement on top of liquefied layer might be critical for pile design.
In case of geotechnical engineer gave an input as free-field soil horizontal displacement profile along the pile depth.
How can we implement this information in SACS i.e. p-y modification or other methodologies ?
It is a movement of at the boundary end of spring not at the pile side.
Can you help to suggest the modelling technique for this issue ?
Regards,
Kasiphon
Kasiphon,
The only way to model soil liquefaction in SACS would be to use the soil liquefaction input in the PSI analysis when linearizing your piles. The PSI soil liquefaction input essentially reduces the p-y and q-z curves to approximate the liquefaction behavior. You can find more information about soil liquefaction here:
https://communities.bentley.com/products/offshore/w/wiki/39470/soil-liquefaction
I know that this isn't the same as your question but I don't know how else you could do this with SACS. We have had users model the piles as structural elements with linearized springs to model the pile/soil interaction, but that is a bit different than displacing the supports throughout the analysis. I think that would be limited to some sort of non-linear time history analysis unless you could somehow linearize the behavior.
Geoff