Built-up steel section

Hello,
I am trying to define a steel built-up section using AQUA. Why do I get the following warnings?

+++++ warning no. 344 in program aqustopo
Not clear location of clamped edge, eg at start of thin-walled element 201 in cross section 1 construction stage 0
The c/t check cannot be done here.
Refer, please, also the AQUA output with “ECHO SECT EXTR”.
+++++ warning no. 345 in program aqustopo
Not clear location of clamped edge, eg at end of thin-walled element 201 in cross section 1 construction stage 0
The c/t check cannot be done here.
Refer, please, also the AQUA output with “ECHO SECT EXTR”.


Unbenannt2

Hello,
the detemination of the locations of clamped edge for the c/t check also depends on the several thicknesses of the plates and the weld. Please note AQUA manual chapter 3.41

"If the user does not specify distances explicitly, it will be tried to guess the support condition
and to combine consecutive plates to a single field if the following conditions hold:

  • they are connected and do not have a bend
  • do not deviate of value ’thickness * shear stiffness’ more than a factor of 1.25 (may be
    changed with CTRL FIXL). This also applies to the thickness of the shear connections
    (WELD). "

In your example the thickness of the welds is too small → 20 mm, flange plate with 40 mm. You can define a thicker weld or manual input of the locations of clamped edge in record PLAT values FIXB and FIXE.

With kind regards
Sabine Fahrendholz
Senior Product Manager