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Hi, I am using truss element(steel bars) and stdbrick element ( concrete) to build a numerical model of reinforced concrete columns. I would like to ask how can I take "geometric nonlinearity" into account in this 3D model? below is my model, any suggestions would be greatly appreciated!

Hi, line and shell elements offer options to account for geometric nonlinearity, including PDelta and Corotational methods. However, for solid elements, this is generally unnecessary due to the typically small deformations involved. Furthermore, the exact geometry of solid elements is already accurately represented.