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Buckling

This part contains parameters of buckling and imperfection. The setting "Use imperfection" adds an and effect of imperfection l0/400 according to 5.2(9) into the analysis. Imperfection is calculated using the basic member length l0 that may be changed in the table in the bottom part of the window. The fundamental length l0 is the real length, not the buckling length.

The buckling analysis may be switched off for certain applications with the help of setting "Calculate with buckling".

The buckling analysis is affected by the creep coefficient that may be specified in the window "Creep". This window may be opened by the button "".

The main parameter of the buckling analysis is the method of verification. Following options are available:

Method based on the nominal stiffness

  • This method is suitable both for partial members and whole structures. It is based on the nominal stiffness that takes into account the effects of cracking, material non-linearity and creep on the overall behaviour. The coefficient that depends on the distribution of first order moment c0 has to be specified for each direction according to the chapter 5.8.7.3(2). Recommended values are described in the chapter "Buckling" of the theoretical help.

Method based on the nominal curvature

  • This method is primarily suitable for isolated members with constant normal force. The nominal second order moment is calculated according to a deflection that is based on the effective length and an estimated maximumcurvature. The method is based on the chapter 5.8.8. The coefficient that depends on the curvature distribution c has to be specified for each direction according to the chapter 5.8.8.2(4). Recommended values are described in the chapter "Buckling" of the theoretical help. Not available for the members made of plain concrete.

Simplified method based on 12.6.5.2 of the standard

  • Simplified method according to the chapter 12.6.5.2 of EN 1992-1-1. Only for members made of plain concrete.

The imperfection and bucking parameters can be specified in tables in the bottom part of the input frame. The tables for imperfection and buckling in two directions are organized into tabs.

Tabs for the input of imperfection and buckling parameters

The table contains one sector along the whole member length as a default for every new member. This sector can be modified using button "Edit" or by double-click on the table row. The properties of the sector are organized in the windows "Imperfection" and "Buckling Y/Z". More sectors can be added (button "Add") for the input of different imperfection/buckling properties along the member length. The new sectors are automatically added behind the first sector according to the start coordinate called "Sector beginning". This point is automatically considered as the end of previous sector.

The particular sectors are displayed also in the active workspace. The sector lengths may be edit by using the active dimensions, double-click on certain sector launches the appropriate window for sector edit.

Part "Buckling" of the member design

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