According to Section 12 of MStower user manual - Member checking, Member checks to TIA-222-G: Effective slenderness ratios KL/r are determined in accordance with Tables 4-3 and 4-4, using member classification and continuity information generated during tower building.
Is this calculated automatically in MStower in all possible cases?
When I define two bolts for x bracing connection result for value of K should be approximately 0.9. Can this be defined somehow manually in geometry input?
Thanks in advance.
In MSTower, you cannot define the K factors in the tower data file but you can definitely input the factors while checking member design.
Checking design option will bring up the following dialog box and it will allow you to code specific factors or override those as shown in the highlight block
If you can provide us the file and provide additional information about what kind of section you are trying to design, we may be in a position to offer more assistance.
Hi Boris, yes the effective length is calculated by MStower. Please note that the con value should be specified for each member or the software will assume the member is concentrically connected.
Thanks, I’m aware of this menu which allows you to manually adjust ‘K’ factors, however I’m confused with title of that option (Non-angle ‘K’ factors).
Does it work only for structural members other than equal or unequal angles, like pipes, chanels etc. Anyway, change of those parameters doesn’t effect on results. Specifically, what I’m trying to achieve is reduction of slenderness ratio of diagonal member that is connected with two bolts at both ends, as per Table 4-4, of Ansi/Tia-G.
In my td file diagonal members for that panel are defined with 2 bolts. Also, connection is specified not as concrentric, but as connection with long leg of angle.
However, slenderness of the diagonal member remains the same as if it connected with one bolt, in other words as if is unrestrained against rotation at both end.
Thanks for quick reply for previous question, it is very much appreciated.
Can you please upload the model file. It would help our product management team to investigate this in more detail and better assist you.
ok i will do that