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*CLOAD

Keyword type: step

This option allows concentrated forces to be applied to any node in the model which is not fixed by a single or multiple point constraint. Optional parameters are OP and AMPLITUDE. OP can take the value NEW or MOD. OP=MOD is default and implies that the concentrated loads applied to different nodes are kept over all steps starting from the last perturbation step. Specifying a force in a node for which a force was defined in a previous step replaces this value. OP=NEW implies that all previously applied concentrated loads are removed. If multiple *CLOAD cards are present in a step this parameter takes effect for the first *CLOAD card only.

The AMPLITUDE parameter allows for the specification of an amplitude by which the force values are scaled (mainly used for nonlinear static and dynamic calculations). Thus, in that case the values entered on the *CLOAD card are interpreted as reference values to be multiplied with the (time dependent) amplitude value to obtain the actual value. At the end of the step the reference value is replaced by the actual value at that time, for use in subsequent steps.

The AMPLITUDE parameter applies to all loads specified by the same *CLOAD card. This means that, by using several *CLOAD cards, different amplitudes can be applied to the forces in different coordinate directions in one and the same node. An important exception to this rule are nodes in which a transformation applies (by using the *TRANSFORM card): an amplitude defined for such a node applies to ALL coordinate directions. If several are defined, the last one applies.

First line:

- *CLOAD
- Enter any needed parameters and their value.

Following line:

- Node number or node set label.
- Degree of freedom.
- Magnitude of the load

Repeat this line if needed.

    Example:

    *CLOAD,OP=NEW,AMPLITUDE=A1
    1000,3,10.3

removes all previous point load forces and applies a force with magnitude 10.3 and amplitude A1 for degree of freedom three (global if no transformation was defined for node 1000, else local) of node 1000.

Example files: achtelp.

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