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Using SAP2000, response-spectrum curves may be generated from a user-defined time-history record through the following process:

  • Define the time-history function through Define > Functions > Time History Menu.
  • Define the time-history load case through Define > Load Cases > Add New Load Case.
  • Select a fixed joint, then display the ground-motion response-spectrum curves for that joint by selecting Display > Show Response Curves, as shown in Figure 1:

Figure 1 - Response-spectrum curves

See Also