Global imperfections settings

Tekla Structural Designer
2021
Tekla Structural Designer

Global imperfections settings

This page in the Model Settings dialog box is used to control the percentages of load used for the global imperfection calculations.

The percentages are material independent, which means that the same percentages are used for concrete and steel. The percentages vary depending on the height of the structure and the number of columns in each direction.

EHF Global Imperfections (Eurocode)

Item Description

Height of the structure

Allows you to specify the effective height of the structure to be used in the EHF calculations.

Set Default

Sets the height of the structure to the highest construction level.

Number of columns in X direction

In the Eurocode Cl 5.2(5) the calculation of the reduction factor am depends on the number of contributing members, m.

Valid input for m in the X and Y directions is any whole number from 1 to 1000. The default value is 1 which results in am = 1.000. If a value of 1000 is entered then am would reduce to 0.707.

Number of columns in Y direction

Global initial sway imperfections

Displays the calculated alpha values and phi percentages for the above input.

The override checkboxes can be used to enter your own percentages in place of the calculated values if required.

NL Global Imperfections (US head code)

Item Description
Global initial sway imperfections

Direction Dir 1, Dir 2

Displays the calculated percentage imperfections to be applied in each direction.

The override checkboxes can be used to enter your own percentages in place of the calculated values if required.

NHF Global Imperfections (BS, IS & AS head codes)

Item Description
Global initial sway imperfections

Direction Dir 1, Dir 2

Displays the calculated percentage imperfections to be applied in each direction.

The override checkboxes can be used to enter your own percentages in place of the calculated values if required.

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