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*T-Z |
 
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*T-Z
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*T-Z |
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To define T-z curves for modelling soil structure interaction.
Refer to Soil Modelling for further information on this feature.
Soil structure interaction can be modelled explicitly by manually specifying T-z curves at different depths.
The keyword format is a block of lines defining the interaction between a particular structure and the soil. The first line is an optional one which specifies the format in which the properties are input. This is followed by a number of lines defining the actual data. As many blocks as required can be used to specify the soil structure interaction over the complete depth required.
Data may defined explicitly within the keyword file itself, or defined separately in an external file which is simply referenced using a FILE= entry. The latter approach is highly recommended as it reduces unnecessary clutter in the keyword file, and also helps to improve user interface performance and enhanced user experience.
The format of the block when using directly entered T-z curve data:
SET=Set Name
DEPTH=Depth
Soil Resistance (T), Deflection (z)
The first line indicates the element set for which the subsequent T-z curves apply. The next line defines the depth to which the curve relates and marks the start of a block containing the T-z curve data at that depth. This block can be repeated at as many depths as required. The final line is a pair of T, z values. This line will be repeated several times for describe a T-z curve.
The format of the block when using T-z curve data from an external file:
SET=Set Name
FILE=File Name
The first line indicates the element set for which the T-z curves apply. The second line specifies an external file containing T-z curve data.
Input: |
Description |
Set Name: |
The name of the element set for which the T-z curve applies. |
Depth: |
The depth below the mudline at which the T-z curve is being defined. |
Soil Resistance, T: |
A soil resistance (T) value for a point on the T-z curve. This has units of force/length. |
Deflection, z: |
The corresponding deflection (z) value. |
Input: |
Description |
Set Name: |
The name of the element set for which the T-z curve applies. |
File Name: |
The file containing the T-z curve data. This data includes depth and T-z data. |
(a)Use as many lines as you need to completely define a particular T-z curve, for a particular combination of element set and depth. Simply leave the Set Name and Depth columns blank for second and subsequent lines of the curve data. For subsequent T-z curves, specify a new Set Name and/or Depth, and specify the T-z data in the same way.
(b)The points defining the T-z curve may be specified in any order. Flexcom subsequently sorts the data pairs into ascending order of deflection.
(a)Flexcom automatically interpolates the T-z data for nodes located between any two specified depths.
(b)If the deflection at a particular node lies between two T-z data points, Flexcom uses linear interpolation to determine the relevant soil resistance.
(c)If the deflection at the node lies outside the specified range of the T-z curve, then Flexcom simply extrapolates from the first or last section of the curve as appropriate.