6.3 Calculation of limit slenderness
Two limit slenderness’s are calculated for ACI code:
- Upper limit slenderness, which is the same for sway and non-sway member
=100
- Lower limit slenderness, which is different for sway and non-sway member
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Type of member |
Clause in ACI 318-05 |
Equation |
|---|---|---|
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Non-sway |
10.12.2 |
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Sway |
10.13.2 |
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where |
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smaller value of factored end moment on a compression member about y(z) axis of LCS of compression member. The value is positive if member is bent in single curvature, and negative if bent in double curvature |
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larger factored end moment on compression member about y(z) axis of LCS of compression member. The value is usually positive, but the value is negative only in case that both end moments are negative too |
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Single curvature |
Double curvature |
|---|---|
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If the member will be sway or non-sway can be set in dialog Buckling and relative lengths > Buckling data or in dialog Buckling coefficients (member buckling data is defined, user input is selected and kyy(zz) = Code dependent ) via property Swaz zz or Sway zz