{"id":368133,"date":"2024-05-22T18:34:16","date_gmt":"2024-05-22T18:34:16","guid":{"rendered":"\/forum\/forums\/topic\/looking-for-tips-to-setting-up-ssi-simulation-involving-soil-liquefaction\/"},"modified":"2024-05-23T18:25:32","modified_gmt":"2024-05-23T18:25:32","slug":"looking-for-tips-to-setting-up-ssi-simulation-involving-soil-liquefaction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/looking-for-tips-to-setting-up-ssi-simulation-involving-soil-liquefaction\/","title":{"rendered":"Looking for tips to setting up SSI simulation involving soil liquefaction"},"content":{"rendered":"<p>Hello, I am looking for tips and advice for the best way to set up my simulation.<\/p>\n<p>Background: I want to investigate the effect of far field soil liquefaction on soil-structure-interaction (SSI) results of a deeply embedded cylindrical structure under earthquake loading. Goal is to to conduct a parametric study, representing the structure by linear elastic elements, surrounded by non-liquefiable backfill soil (modelled nonlinear, red in screenshot attached), and liquefiable soil (modelled nonlinear, green in screenshot attached) in the far field. I would then change the extent and properties of the non-liquefiable soil until the impacts on the SSI results are negligible. Since I am only interested in the relative difference in results of the different scenarios, I was thinking a 2D analysis would be appropriate.<\/p>\n<p>At this time my two main questions \/ concerns are:<\/p>\n<p>1) To model soil liquefaction I want to follow the approach per paper by Richard Sturt &#8216;Modelling liquefaction of soils with LS-DYNA using a&nbsp;SANISAND-based material model&#8217;. Now per my research so far the SANISAND material model is meant for solid elements only. So is the MAT_HYSTERETIC, which I was planning on using for the non-liqueqfiable soil. Could I use these material models in a 2D analysis ? Apparently they do work for plane strain and axisymmetric shell formulations (and thick shell formulations for MAT_HYSTERETIC)&#8230;<\/p>\n<p>2) When solving a very simple 2D analysis in LS Dyna, I received the following warning message: &#8220;A 2D-Model is a beta feature for an Explicit LS-Dyna analysis.&#8221; All papers \/ examples I found on SSI using LS Dyna are 3D models. Now I am wondering if a 2D analysis is a good choice in general ? Or should I rather opt for a full 3D simulation ? My main driver for a 2D analysis was simplifying the modelling and saving computing resources. But if I run into issues and can&#8217;t find any documentation or resources, I have gained nothing. I want to note I am very new to Ls Dyna, and Ansys in general.<\/p>\n<p>I am using Ansys workbench 2024R1 (not the student version). Grateful for any advice I can get! Thank you.<\/p>\n<p>Joerg<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/22-05-2024-1716402146-model description.png\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-368133","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I am looking for tips and advice for the best way to set up my simulation.Background: I want to investigate the effect of far field soil liquefaction on soil-structure-interaction (SSI) results of a deeply embedded cylindrical structure under earthquake loading. 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