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~TIS

 

~TIS, Name, Ext, G_Dir, KTIS

Defines an initial stress state of terrain.

SOLUTION: GEOTECHNICAL MODULE: Initial Stress

Name

Name of the initial stress file.

Ext

Filename extension (8 characters maximum). The extension defaults to IST if Ext is blank.

G_Dir

Gravity direction. Valid labels are:

X or +X

Y or +Y

Z or +Z

-X

-Y

-Z

KTIS

Type of file created

0	Compatible with the ANSYS command ISFILE.
1	Compatible with the ANSYS command INISTATE.

Notes

- This command is also available in PREP7.

- Creates a file with the information necessary to define an initial stress state in a terrain subjected only to its self-weight.  

- The element types and the ANSYS command for reading the initial stress data file that are applicable to each option of KTIS are

  Since INISTATE command is not longer supported, it is suggested to define initial stresses on the element types 182, 183, 185, 186 and 187.

- This command operates only on elements with rock or soil material. The remaining elements are ignored.

- The coordinate system with respect to is indicated the direction of gravity and the initial stresses are calculated is the active (global or local), and must be Cartesian.

- The initial stresses are calculated at the center of the element and are expressed in the element reference, if KTIS = 0; or in the global reference, if KTIS = 1.

- When reading the file, you must have selected the elements to which initial stresses are applied.

- The calculation method is described in section 17-A.11 of CivilFEM Theory Manual.

- In order to avoid incoherent results, an element should only have one single boundary element at each one of its boundary faces. If the model needs this kind of geometry (construction phases with birth and death of elements, for example) it is possible to create the Initial stresses file with part of the model (just the terrain elements) and afterwards create the rest of the elements.

Menu Paths

Main Menu > CIVIL Solution > Geotech. Mod. > Initial Stress > Create File

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