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Effective Length Factor of Flexural Stiffness Released Columns in Sidesway Uninhibited and Inhibited Frames
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DOI：10.1007/s13296-025-01016-9.png)
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Abstract
En 中文
The column ends' stiffness is released due to the connection to corner foot joints by bolts or nesting. It makes the actual effective length factor mu of this column higher than the calculated value mu 0 according to equations in existing standards and codes. A correction factor gamma is proposed and multiplied by mu 0. The factor beta describes the relative flexural stiffness of each column end. Based on elastic buckling analysis of 2156 sidesway uninhibited columns and 2475 sidesway inhibited columns with different beta values, relations between gamma, beta, the flexural stiffness ratio between beams and columns in each end (K1 and K2) are fitted as equations. The high accuracy of these equations has been proven by the coefficient of determination (r2) and the root mean square error (RMSE). Furthermore, the end connection can be treated as rigid when the flexural stiffness of the column ends is no less than 80 times the flexural stiffness per unit length of column ic for sidesway uninhibited columns, or 200ic for sidesway inhibited columns.
Keywords:
Buckling length factor
Flexural stiffness release
Sidesway uninhibited frame column
Sidesway inhibited frame column
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