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Buckling

The upper part of the window contains buckling parameters (consideration in the analysis, fundamental lengths Lx and supporting style) for directions Y and Z (in analysis type "Concrete 2D" only direction Y). The pinned supporting style is considered as a default, the buckling length is equal to the fundamental length in this case. The different supporting style for directions Y and Z may be selected in the window "Buckling length" that is available after clicking on the button with a calculator.

Creep coefficient

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 with a calculator.

Method based on

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 maximum curvature. 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 calculation details are displayed in the bottom part of the window.

Window "Buckling"

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