Imperfection moment of column

[dccd]

anyone familiar with prokon column design ? I have no idea how the program calulcate the imperfection moment in the slender column (braced/unbraced......

I have tatached an example here , it's an unbraced slender column here. Why the imperefction moment about y axis and y axis arent the same ? X axis imperfetion moment = 0.85kNm, while the y-axis imperfection moment is 4.41kNm,

https://we.tl/t-Fw9Tvf8fhL

 

[rb1957]

have you tried PROKON helpdesk ?

another day in paradise, or is paradise one day closer ?

 

[dhengr]

Dccd:
As compared with the x-axis, everything about the y-axis is much more flexible, lower moment of inertia, lower section modulus, etc.; greater deflections from a given nominal load occur and then induce still greater moments from the P-delta type effects. I don’t know that software, but the above is probably what is giving you the larger moment about the y-axis.

 

[dccd]

I have no idea how prokon get X axis imperfetion moment = 0.85kNm, while the y-axis imperfection moment is 4.41kNm,

 

[Settingsun]

The imperfection moment has been calculated as 4.5 kNm. This has been apportioned to the x and y axes according to the 79.1 degree orientation of the neutral axis. Due to the large moment due to slenderness, the column ends up largely in y-axis bending with a relatively small x-axis component. The column is too slender and fails the code check because of this.

 

[Brad805]

Your column is 200x400 and appears to be 15.0m long. Your slenderness ratio comes out to 315 in one line of the output. Is your input correct?