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~TNADDPL

 

~TNADDPL, MPI, MPF, Ri, Rf, ang

Defines a stretch of the tunnel in plan view

PREP7: GEOTECHNICAL MODULE: Tunnel

MPI, MPF

First and last mile points (MPs) of the stretch. MPI should have been defined before with the ~TNINIP command, the point MPF is created with this command. If MPI is omitted the program takes the end of the last defined stretch.

RI, RF

Initial and final curvature radii. If Ri is omitted then RF is taken from the previous stretch, but if this stretch isn’t defined (initial stretch) then the radius is taken as infinity. If RF = 0 or omitted then the radius is taken as infinity.

 

If Ri = Rf ¹ null or 0 then it is a circumference.

 

If Ri ¹ Rf then it is a clothoid.

 

ANG

Angle between the tangent to the section in the point MPI and the tangent to the previous stretch in the same point.

Notes

- The tunnel layout must be specified in one way only: plan view or elevation view. If the first tunnel’s stretch was defined in plan or elevation view then next stretches must be specified in the same way.

- In plan view the tunnel path can be defined as a sequence of straight segments, arches of circle or arches of clothoid.

- From the first point of the path (defined with the ~TNINIP command) each stretch situates new points, being supported in the end of the previous stretch.

- The stretches should be introduced correlatively in the numbering without laps in the points.

- Ri and Rf have positive sign if the curve rotates to the left and negative sign on the contrary case.

- In the first stretch, ANG is the angle with the director vector (vX,vY,0) (see ~TNINIP command).

Menu Paths

Main Menu > CIVIL Preprocessor > Geotech. Mod. > Tunnels > 3D > P View Generation > Define Plan View

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