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Buckling of frame braced by linear elastic springs

100%

Iwicki P.

2010

tom Vol. 14, nr 2

201-213

In the design codes and specifications, simplified formulae or diagrams are given for determining the buckling lengths of frame columns based on the ruling criterion of considering frames as sway or non sway. Due to the fact that, the code formulae utilize only local stiffness distributions, these formulae may yield in certain cases rather erroneous results. In most code formulas a case of weakly braced frames is usually not considered. In this paper the classical Winter model, developed originally for columns is applied for frame structures and compared with the results of parametric study of frame with bracing. Sensitivity analysis of critical loads of frame due to bracing stiffness variations is carried out and the method for calculation of the threshold bracing stiffness condition for frames is proposed.

Projektowanie ściskanych elementów żelbetowych wg Eurokodu 2 - kryterium smukłości i długość efektywna

80%

Wandzik G.

2013

tom nr 1

72-75

Article is dedicated to the explanation of assumptions needed for the control of slenderness criterion in RC members under compression. Short comparison to the previous standard is presented. Several remarks concerning effective length determination are also delivered.