Model responses are examined under different loading conditions for a single element. Beaty, PhD, PE, GE Beaty Engineering LLC and Prof. Different sets of model input parameters are provided for sands with different relative densities. UBCSAND CONSTITUTIVE MODEL Version 904aR Documentation Report: UBCSAND Constitutive Model on Itasca UDM Web Site by Michael H. Panagiota Tasiopoulou, Yannis Chaloulos, Nikos Gerolymos, Amalia Giannakou and Jacob Chacko have co-authored two papers, introducing the implemented version of Ta-Ger (Tasiopoulou and Gerolymos, 2016a,2016b) multiaxial constitutive model for sand in FLAC and FLAC3D. This paper presents the new modified framework of analysis and describes a guideline to calibrate the input parameters of the updated model to capture liquefaction triggering and post-liquefaction cyclic mobility and the accumulation of plastic shear strain. The model has been improved with new flow rules to better capture contraction and dilation in sands and has been implemented as PDMY03 in different computational platforms such as OpenSees finite-element, and FLAC and FLAC3D finite-difference frameworks. The C++ Plug-in option of FLAC3D permits you to create, load, and run your own user-defined constitutive model (UDM). A constitutive soil model that was originally developed to model liquefaction and cyclic mobility has been updated to comply with the established guidelines on the dependence of liquefaction triggering to the number of loading cycles, effective overburden stress (Kσ), and static shear stress (Kα). The thermal option of FLAC3D incorporates both conduction and advection models and a thermal hydration constitutive model.
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