Buckling of frame braced by linear elastic springs

• Autorzy: Iwicki P.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

frame; buckling; bracing; effective length

PL

rama; wyboczenie; stężenie; długość efektywna

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Mechanics and Mechanical Engineering
• Rocznik: 2010
• Tom: Vol. 14, nr 2
• Strony: 201--213
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Iwicki P.

• Faculty of Civil and Environmental Engineering, Department of Structural Mechanics and Bridges, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland

Bibliografia

• [1] PN-90/B-03200 Steel structures. Design rules (Polish standard), PKN, Warszawa, 1990.
• [2] Eurocode 3: Design of Steel Structures. Part1.1: General rules and rules for buildings, ENV 1993-1-1, CEN, Brussels, 1992.
• [3] Ozmen, G. and Girgin, K.: Buckling lengths of unbraced multi-storey frame columns, Struct. Eng. and Mechs, 19(1), 55-71, 2005.
• [4] Tong, G.S. and Ji, Y.: Buckling of frames braced by flexural bracing, J. Construct. Steel Res., 63, 229-236, 2007.
• [5] Winter, G.: Lateral bracing of columns and beams, Proc. ASCE, 84, 1561-1-1561-22, 1958.
• [6] Yura, J .A.: Winter's bracing approach revised, Eng. Struct., 18(10), 821-825, 1996.
• [7] Trahair, N.: Flexural-Torsional Buckling of Structures, E&FN Spon, London, 1993.
• [8] Haug, E.J., Choi, K.K., and Komkov, V.: Design sensitivity analysis of structural system, Academic Press, Orlando, 1986.
• [9] Iwicki, P.: Sensitivity analysis of critical loads of I-columns, Arch. Civil Eng., 53(4), 591-606, 2007.
• [10] Szymczak, C.: Sensitivity analysis of thin-walled members, problems and application, Thin-Walled Structures, 41, 271-290, 2003.
• [11] Iwicki, P.: Sensitivity analysis of critical forces of trusses wit h side bracing, J. Construct. Steel Res., 66, 923-930, 2010.
• [12] ROBOT STRUCTURAL ANALYSIS PROFESSIONAL User Manual, Version 2010, Autodesk Inc, 2009.
• [13] EXCEL User Manual, Microsoft Corporation, 2007.