Member check parameters for DIN 18800

Safety factors

gamma M0

Safety factor.

Default sway types

These default sway types are used for all members, unless the user changes them in the settings made for particular members. The sway type is used for calculating the buckling ratios.

Y-Y

If ON, the members are sway for buckling about the Y-Y axis.

If OFF, the members are non-sway for buckling about the Y-Y axis.

Z-Z

If ON, the members are sway for buckling about the Z-Z axis.

If OFF, the members are non-sway for buckling about the Z-Z axis.

Buckling length ratios ky, kz

Max k ratio

The calculated value of k is limited and must not exceed the given value

Max. slenderness

If the slenderness of the checked member exceeds this value, the program prints a warning in the output report.

2nd order buckling ratios

According to input

The buckling data are considered in the 2nd order analysis by values as they were defined.

All non-sway

The whole structure is considered as non-sway.

elastic check only

If this option is checked, all members are assessed to elastic check only.

Note: For EC 3,NEN6770/6771,BS5950, SIA263: check as class 3 section, Wel is used.

section check only

If this option is checked, only the section check is carried out. No stability check is performed.

Critical LTB according to

DIN 18800 – form (19)

Critical moment for LTB is calculated according to DIN 18800 (formula 19).

EC3 – Annex F

Critical moment for LTB is calculated according to EC3 - Annex F.

Roik Carl Lindner

Critical moment for LTB is calculated according to Roik, Carl and Lindner.

This selection is only valid for symmetrical I shapes.

For more information about the calculation of the critical LTB moment, we refer to Steel Code Check Theoretical Background, DIN 18800.

Double bending check with

method 1 – form (28)	Method 1 is activated.
method 2 – form (29)	Method 2 is employed.

Limit for torsional check	This parameter introduces a limit for torsional check. This value refers to the unity check, based on the torsional shear stress only. If this value is exceeded, a composed elastic stress check (normal stress and shear stress check) is automatically performed regardless of the section classification.
Only LTB stability check in 2nd order calculation	When this option is selected, there is no buckling check performed. Only LTB check is carried out in the stability check.
LTB check for RHS/CHS sections	The LTB check can be activated for RHS / CHS sections (Rectangular Hollow Section / Circular Hollow Section).
Elastic check according to T1 article 750	When this option is ON, the potential plastification described in the mentioned article, will be used

The procedure to adjust the basic member check parameters

See the procedure described in chapter: Member check parameters for EC-ENV.