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The ShellMITC4 element is applicable to the analysis of both thin and thick shells according to the reference: https://www.researchgate.net/profile/Eduardo_Dvorkin/publication/235313212_A_Continuum_mechanics_based_four-node_shell_element_for_general_nonlinear_analysis/links/00b7d52611d8813ffe000000....

Hi there,

You can define soil element using this command:
http://opensees.berkeley.edu/wiki/index ... -p_Element

so you can model the fluid pressure as the 4th DOF and simulate dynamic response of solid-fluid fully coupled material.

Best,

Hi there

I want to account for the effect of high-cycle fatigue in a concrete member. Is it possible to use the uniaxialMaterial Fatigue to consider the fatigue effects? If not, how can i model the high-cycle fatigue?