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Pointloads on groundlevel
29-06-2018, 09:45 AM, (This post was last modified: 29-06-2018, 09:45 AM by shaswin.)
#1
Pointloads on groundlevel
Hello,

Is it possible to exten PLE with a loading on groundlevel like TOPLOAD_GROUND (pointloads) with coordinates for a certain identifier and that Ple4Win calculates the topload on top pipe level (with the method combination of Braunstorfinger and Boussinesq)?

Example:
REF_POINT | TOPLOAD_GROUND [N] | X-COORDINATE [mm] | Y-COORDINATE [mm]
PointLoad1 | 100000 | 0 | 0
PointLoad2 | 100000 | 1000 | 1000
etc.

IDENTIFIER | REF_POINT
Start | PointLoad1
Start | PointLoad2
Ident2 | PointLoad1
etc.

The maximum value to take into account in the calculation is then MAX(TOPLOAD_GROUND, TOPLOAD).

Example:
Consider you have a pointload with 100 kN, soilcover of 1.25 m and a outer diameter of 200 mm. The calculated value is then 26.931 kN/m2 on top pipe level.
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29-06-2018, 04:10 PM,
#2
RE: Pointloads on groundlevel
I'll discuss it with our team. It doesn't look like a situation that will occur often.

It is technically possible, but might get more complicated as one might expect: Usually those point loads are loaded tires of e.g. a truck. If the truck is driving/standing not on the soil itself, but on a road or platform, the construction of that must also be entered in the program (as an asphalt strip or a concrete plate will massively distribute each pointload).
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29-06-2018, 05:58 PM, (This post was last modified: 01-07-2018, 06:17 AM by shaswin.)
#3
RE: Pointloads on groundlevel
It is not difficult. One can model crane loadings (as concentraded pointloads or multiple pointloads) and moving vehicles (according to NEN-EN 1991-2+C1:2011) above the pipeline. It is no problem if there is asphalt above, you can use the equivalent depth of cover calculation for this conform the NEN 3650-1 article C.5.2 (Effect of road constructions in reducing traffic loads). The H_eq can be used then in Braunstorfinger.

In the NEN-EN 1991-2+C1:2011: the following vehicles pointloads are given:
Load Model 3 (Graph I Figure C.17, NEN 3650-1)
Fatigue Load Model 2, Lorry 1
Fatigue Load Model 2, Lorry 2
Fatigue Load Model 2, Lorry 3
Fatigue Load Model 2, Lorry 4 (Graph II Figure C.17, NEN 3650-1)
Fatigue Load Model 2, Lorry 5
There are more loading combination in the NEN=EN 1991-2, for example for special vehicles.
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10-07-2018, 09:07 AM,
#4
RE: Pointloads on groundlevel
Agreed, it's possible, the complexity will depend very much on how detailed / flexible we would decide to implement such functionality.

The question remains how frequent these types of loads are encountered during pipeline calculations. Our experience is that these are special cases, which whould put this feature in the category "nice to have".

Anyway, I assigned ticket no J-2213 to this new functionality request.
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11-07-2018, 03:52 PM,
#5
RE: Pointloads on groundlevel
It would be nice as a Wizard in the Module Xx-range.
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