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*Properties |
 
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*Properties
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*Properties |
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To assign effective structural properties to element sets for use in calculating stresses.
Refer to Stress Properties for further information on this feature.
A block of two lines repeated as often as necessary. Each property specified on the second line can be omitted, in which case a default value will be used for stress calculations:
SET=Set Name
Do, Di, A, Iyy, Izz
The properties specified here are used in calculating stresses during modal analysis. This keyword is optional and may be ignored if you wish to use the actual properties (e.g. via the *GEOMETRIC SETS keyword in the $MODEL section), or properties explicitly specified for stress computations (i.e. via the corresponding *PROPERTIES keyword in the $MODEL section), as the values specified in the model definition are carried through to Modes.
If any of the parameters A, Iyy or Izz are omitted, default values are computed based on the specified (or default) values of Do and Di.
Input: |
Description |
Set Name: |
The name of the element set to which the stress properties are to be assigned. This defaults to all elements. |
Do: |
The effective outside diameter for the elements of the set. The default depends on the format used to specify geometric data. If you used the Flexible Riser Format, then the default is the drag diameter for the elements of the set. If you used the Rigid Riser Format or Mooring Line Format, then Do here defaults to Do input in the properties data |
Di: |
The effective internal diameter for the elements of the set. The default is the internal diameter specified in the geometric data. |
A: |
The effective cross-sectional area for the elements of the set. The default is given by:
where Do and Di are the inputs described above, default or otherwise. |
Iyy: |
The second moment of area about the local y-axis for the elements of the set. The default is given by:
where Do and Di are the inputs described above, default or otherwise. |
Izz: |
The second moment of area about the local z axis for the elements of the set. The default is Iyy above. |
(a)This keyword is identical to the *PROPERTIES keyword of the main $MODEL section. If you use the keyword in $MODEL to specify stress properties, then these automatically carry through to Modes and you do not need to repeat the specification here. Refer to Stress Properties for a detailed discussion of the various parameters above.
(b)Modes outputs stress data to the program output file only if you use the Output Options - Specify facility to include details of the static solution in this output. Stresses are also included in the eigensolution details for individual eigenpairs if the Modes run generated SHEAR7 output. So the use of this option is meaningless unless either of these conditions apply.
