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Nonlinear Equation for Flexural Stiffness of Slender Composite Columns in Major Axis Bending

Approximately 12,000 isolated square composite columns, each
with a different combination of specified properties of variables, were simulated and used to generate the stiffness data. The columns
studied were subjected to short-term ultimate loads and equal and opposite end moments causing symmetrical single curvature bending
about the major axis of the encased steel section.
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