Tube sections are rectangular or quadratic hollow uniform profiles. Critical stress is checked at 5 locations as shown in figure below.
Section Properties
Ax
, Ix
, Iy
, and Iz
are taken from the STAAD.Pro database.
where
Ay
| = |
2ht, similar as for wide flange profiles, see Section 5.2 |
Az
| = |
2(2/3)bt; (Ay and Az
are not used in code checks) |
Cw
| = |
ref. NS app. C3 |
Stress calculation at selected stress points
h1 = h/2 - t
h2 = h/2 - t/2
b1 = b/2 - t
b2 = b/2 - t/2
Point No |
σx
|
σby
|
σbz
|
τx
|
τy
|
τz
|
1 |
|
|
0 |
|
|
0 |
2 |
|
|
|
|
3 |
|
|
|
|
4 |
|
|
|
|
5 |
0 |
|
0 |
|
The general stress formulation is given in sec. 5.2.