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The data used to add a centerline From tunnel designer in PLAXIS Output are not correctly updated in the case of having an offset in the tunnel begin point position (General tab in the tunnel designer). This means that the centerline added in the Output program will not correspond to the updated position, resulting in wrong results for structural forces in volumes.
The problem can occur in two situations, when:
Figure .1 Output structural forces view: Centerline not updated when having tunnel with offset
In PLAXIS 2D 2016.00 you can now also use the automatic centerline tool to make sure to select the correct volumes for the structural forces determination.
One of the two problems has been solved in 2D2015.02: when you already have defined the offset before generating a thick lining, the centerline will be determined correctly. However, if after generating a thick lining you change the location of the tunnel (e.g. via Offset), the tunnel file is not updated anymore, resulting in the originally defined location.
We are working on a solution. For now we have this work around:
In the case of an arc type, the origin coordinates need to be updated. The offset displayed in the tunnel designer should be subtracted from the existing coordinates of the origin of the arc, in order to have the correct centerline data.
In the case of polyline, the coordinates of all points need to be updated. The offset displayed in the tunnel designer should be subtracted from the existing coordinates of the points of the polyline, in order to have the correct centerline data.
Offset to begin point:Axis 1 : 5.000Axis 2 : 1.000
Existing data
Arc type:"origin": [6.5, 1.3]Polyline type:"points" : [ [4.25, 1], [5.5, 3.5], [6.75, 1], [4.25, 1] ]
Corrected data
Arc type:"origin": [1.5, 0.3]Polyline type:"points" : [ [-1.25, 0], [0.5, 2.5], [1.75, 0], [-1.25, 0] ]
In the case of an arc type, the origin coordinates needs to be updated. The offset displayed in the tunnel designer should be added to the existing coordinates of the origin of the arc, in order to have the correct centerline data.In the case of polyline, the coordinates of all points need to be updated. The offset displayed in the tunnel designer should be added to the existing coordinates of the points of the polyline, in order to have the correct centerline data.
Offset to begin point is:Axis 1 : 5.000Axis 2 : 1.000
Arc type:"origin": [11.5, 2.3]Polyline type:"points" : [ [9.25, 2], [10.5, 4.5], [11.75, 2], [9.25, 1] ]
Create centerline for Structural Forces in Volumes
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