Tension/Compression-Only

By default, a member is linear.  You may assign nonlinearity (tension-only or compression-only) to the selected members.  The member stiffness will be ignored if a tension-only member is subjected to compressive forces or if a compression-only member is subjected to tensile forces. The presence of tension- or compression-only members makes the model nonlinear, so an iterative solution is required for each load combination.