The orientation of acceleration load may be specified for certain types of load cases, including response-spectrum and time-history, as shown for SAP2000 in Figure 1:

Figure 1 - Angle specification for time-history acceleration load

For other types of load cases, including static, modal, and buckling, acceleration load is specified along the global axes. However, acceleration load may still be applied in an arbitrary direction using either of the following two methods:

See Also