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This page is devoted to frequently asked questions (FAQ) related to buckling. |
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Analysis
Why do my hand calculations not match linear-buckling results?
ANSWER: Structural objects should be meshed before running linear-buckling analysis such that the software may accurately capture the instability modes under the specified set of loading conditions.
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What happens analytically when a member reaches buckling capacity during nonlinear buckling analysis?
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The structural softening which occurs under lateral-load application may still be captured. However, nonlinear analysis must be run with P-Delta and Large Displacement effect. Lateral load may then be plotted against lateral displacement. Initially, this relationship will be linear, but then the structure will begin softening at a certain load. Response of a column with slight initial perturbation is shown in Figure 1:
Figure 1 - Nonlinear buckling evaluation
Reporting
How should internal forces and reactions be interpreted for buckling analysis?
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ANSWER: The internal forces and reactions reported for buckling load cases correspond to the buckled configuration of the structure. For a vertical cantilever model, the structure buckles laterally, generating internal moments and shears without axial force.
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Why am I getting a negative-stiffness error during P-Delta analysis?
ANSWER: Negative stiffness occurs during P-Delta analysis when structural objects buckle under second-order P-Delta effects. To avoid negative stiffness and buckling, object size should be increased, especially at columns and diagonals.
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