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Membrane elements are shell elements with zero flexural stiffness and zero axial compression stiffness.
In Project settings > Functionality options Nonlinearity > Membrane elements and 2nd order – geometrical nonlinearity must be selected.
In Calculation, Mesh > Solver Setup the parameter Nonlinearity > Geometrical nonlinearity – 2nd order must be set to Newton-Raphson method (even the Modified Newton-Raphson is not allowed for this type of calculation).
Usually the nonlinear calculation must be run in order to obtain realistic results. This means that at least one nonlinear combination must be defined.
Note: Technically speaking, SCIA Engineer allows you to run even a linear calculation with the membrane members defined, but the results may be seriously affected (negatively) by the one-step solution. Therefore, in general, use the nonlinear calculation for the membrane members.