Set this parameter equal to the name of the amplitude curve that defines the magnitude of the load during the step.

If this parameter is omitted in an ABAQUS/Standard analysis, the reference magnitude is applied immediately at the beginning of the step or linearly over the step, depending on the value assigned to the AMPLITUDE parameter on the *STEP option (see “Procedures: overview,” Section 6.1.1 of the ABAQUS Analysis User's Manual). If this parameter is omitted in an ABAQUS/Explicit analysis, the reference magnitude is applied immediately at the beginning of the step.

This parameter applies only to ABAQUS/Standard analyses.

Set this parameter equal to the load case number. This parameter is used in *RANDOM RESPONSE analysis (“Random response analysis,” Section 6.3.11 of the ABAQUS Analysis User's Manual), when it is the cross-reference for the load case on the *CORRELATION option. This parameter is also used in *STEADY STATE DYNAMICS analysis (direct, modal, or subspace)—(see “Direct-solution steady-state dynamic analysis,” Section 6.3.4 of the ABAQUS Analysis User's Manual; “Mode-based steady-state dynamic analysis,” Section 6.3.8 of the ABAQUS Analysis User's Manual; or “Subspace-based steady-state dynamic analysis,” Section 6.3.9 of the ABAQUS Analysis User's Manual), when LOAD CASE=1 (default) defines the real (in-phase) part of the loading and LOAD CASE=2 defines the imaginary (out-of-phase) part of the loading. The parameter's value is ignored in all other procedures.

Set OP=MOD (default) for existing *CONNECTOR LOADs to remain, with this option modifying existing connector loads or defining additional connector loads.

Set OP=NEW if all existing *CONNECTOR LOADs applied to the model should be removed. New connector loads can be defined.