Bending Excess for L-schaubilder

The calculation of bending excess for profiles of type L-schaubilder is controlled via a table in the profile restriction file. The table shall be defined per profile type and each line in the table has the following syntax:

BENDING_EXCESS_CONTROL_TAB<a>_<X>=[+]<S>[,<V>]

Parameter <a>:

<a> shall be equal to either 1 or 2 depending on if the table should be used for a stiffener end with or without a notch:

Figure 2:1. Endcut Geometries for a=1 and 2.

Parameter <X>:

<X> is the maximum bending for which the line (row in the table) is valid:

Figure 2:2. Measuring of Curvature.

If the profile is shorter than 2000 mm it is temporarily extended at each end in the direction of the tangent because the curvature is examined at both ends independently.

Parameter <S> and <V>:

[+]<S> is the amount of bending excess to add to the profile. It is calculated and applied differently depending on if [+] is given or not.

If [+] is given then <S> is an absolute amount of material to add to the profile either at the endcut zero point or to the profile end point depending on the angle of the endcut.

If [+] is not given then the amount of bending excess is calculated as <S>*<profile height> and applied to the point where the endcut geometry has y = 0.

The amount given by +<S> is called "stoss". This name is used in the generic file and in the list for manual fabrication of profiles created by PCI. If <S>*<profile height> is used then "stoss" is calculated and presented as if it was given via +<S>

Figure 2:3. Bending Excess given with <s>.<profile height>.

Figure 2:4. Bending Excess is given with +<s>.

[,<V>] is optional. It controls the amount of bending excess together with <S>. It is only valid if [+] is NOT given and is always used as a factor of the profile height. It is calculated from the profile end point. If both <S> and <V> are given then the one creating the largest bending excess for that end is used.

Figure 2:5. Bending Excess is given with <v>.

Example of table

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PROF_TYPE=20

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BENDING_EXCESS_CONTROL_TAB1_30=+100

BENDING_EXCESS_CONTROL_TAB1_100=1

BENDING_EXCESS_CONTROL_TAB1_9999=1.5

BENDING_EXCESS_CONTROL_TAB2_100=0

BENDING_EXCESS_CONTROL_TAB2_9999=1.5,0.8

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This example is interpreted as follows:

For profiles of type 20 without a notch in the endcut (<a>=1):

• If the bending (<X>) is less or equal to 30 then 100 mm material is added to the profile end.

• If 30 < X < 100 then 1*<profile height> mm material is added to the profile end.

• If 100 < X < 9999 then 1,5*<profile height> mm material is added to the profile end.

For profiles of type 20 with a notch in the endcut (<a>=2):

• If 0 < X < 100 then no material is added to that profile end.

• If 100 < X < 9999 then either 1,5*<profile height> mm material is added to the point where the weld trace start or 0.8*<profile height> mm material is added to the true profile end point depending on which gives the biggest bending excess.