I NEED HELP WITHS THIS PARAMETERS , HOW I CAN CALCULATE.
You can use the traditional approach to determine the effective length factor as specified in the AISC-unified code.There is a standard alignment chart illustrated in the AISC -360-05 code (Fig-c-c2.3 ). This chart is based on some relationships explained in the the page-16.1-240. If you in use the AISC ASD code (9th edition) in Staad, then you can directly get the KY and KZ value calculated by similarly AISC nomogram (Page-5-137). All you need to do is click on the CALCULATE button.
The determination of K value is a cumbersome process for a big structure involving intricate framing system. In such case, it is suggested to perform the second order Direct analysis as specified in the AISC design code where K is assumed as 1 to determine Pn.
i don't have the "CALCULATE BOTTON"
Answer Verified By: Jose Gonzalez
A couple of points. If you are using the AISC 360-10 then you should use the DIRECT ANALYSIS which is the analysis method which is most generic and applicable for all structures. Another great advantage of using DIRECT ANALYSIS is that you can use K=1.0 for all members. The DIRECT ANALYSIS is available in STAAD.Pro as one of the analysis options. The AISC 360-10 does allow using effective length method but only for certain scenarios. Moreover the calculation of the effective length factors could be quite tedious even if you use the alignments charts provided as part of the appendix 7. A sample calculation for effective length factor is attached for your reference.
You are above calculation /example is not displayed, the you may check the following.