Re - calculation of the overall buckling length in segmented members.

In the detailed results of a segmented Member, SACS indicates that the overall buckling length for segmented members is recalculated according to the buckling load of that segment. Can anyone show me a solved manually example, showing the way in which SACS recalculates the overall buckling length in segmented members (K * L)? I mean the value indicated below:

****** Member's Properties ******

Slenderness Ratio (KL/r)y 178.63

Slenderness Ratio (KL/r)z 178.63

Radius of Gyration ry 41.78

Radius of Gyration rz 41.78

Eff. Length Factor Ky 2.10

Eff. Length Factor Kz 2.10

Overall Buck. Length Ly 37.95 (m.)

Overall Buck. Length Lz 37.95 (m.)

Final (K*L)y 79.70 (m.)

Final (K*L)z 79.70 (m.)

- Segmented Member: Overall buckling length is re-calculated
from apprximate buckling load effectively at this segment.
Leffy 35.54 (m.)   ????
Leffz 35.54 (m.)  ????

TUB Ring Spacing 37.95 (m.)

Reduction Factor Cmy 0.85

Reduction Factor Cmz 0.85

  • Jose,

    The effective lengths for segmented members are supposed to represent the effective slenderness of the segment based upon the overall buckling capacity of the member. The buckling load needs to be calculated numerically for segmented members since the section properties (especially ry and rz) vary over the length of the member. SACS calculates the buckling load for the overall member and then calculates the effective slenderness for the segment using this equation:

    Regards,


    Geoff