![]() Tension-only members in moving-load analysis The software uses full axial stiffness (AE/L) as though no limits are assigned. Axial frame behavior is replaced with a sufficiently soft spring (1e-6*EA/L) which simulates zero stiffness. When linear analysis uses the stiffness at the end of a nonlinear analysis load case, axial frame behavior depends on whether or not the tension/compression limits are exceeded at the end of the case, conditions for which are described as follows:.When linear analysis is performed using the initial stiffness of a member (stiffness at zero), computation will use the full axial stiffness (AE/L) as though no limits are assigned.In general, use a nonlinear analysis technique when tension/compression limits are present in the model. Tension/compression limits will only be activated in a nonlinear static or nonlinear direct-integration time-history analysis load case.Note that the assignment of tension/compression limits is a nonlinear analysis feature, and some applicable points, taken from Context Help, include: Set the compression limit to zero through Assign > Frame > Tension/Compression Limits. ![]() Select all frame objects which will only carry tension.Tension-only members may be modeled through the following process: ![]()
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