DOI QR코드

DOI QR Code

Effective length factor for columns in braced frames considering axial forces on restraining members

  • Mahini, M.R. (Civil Engineering Group, Persian Gulf University) ;
  • Seyyedian, H. (Civil Engineering Department, Shiraz University)
  • 투고 : 2005.04.22
  • 심사 : 2006.01.10
  • 발행 : 2006.04.20

초록

The effective length factor is a familiar concept for practicing engineers and has long been an approach for column stability evaluations. Neglecting the effects of axial force in the restraining members, in the case of sway prevented frames, is one of the simplifying assumptions which the Alignment Charts, the conventional nomographs for K-Factor determination, are based on. A survey on the problem reveals that the K-Factor of the columns may be significantly affected when the differences in axial forces are taken into account. In this paper a new iterative approach, with high convergence rate, based on the general principles of structural mechanics is developed and the patterns for detection of the critical member are presented and discussed in details. Such facilities are not available in the previously presented methods. A constructive methodology is outlined and the usefulness of the proposed algorithm is illustrated by numerical examples.

키워드

참고문헌

  1. American Institute of Steel Construction (AISC). (2005), Specification for Structural Steel Buildings, Chicago
  2. American Concrete Institute (ACI). (2005), Building Requirements for Structural Concrete, ACI 318-05, Farmington Hills, MI
  3. American Association of State Highway and Transportation Officials (AASHTO). (1998), Load and Resistance Factor Design Specifications for Highway Bridges, 2nd Ed. Washington, D.C.
  4. Bridge, R.Q. and Fraser, D.J. (1987), 'Improved G-factor for evaluating effective length of columns' J. Struct. Eng., ASCE, 113(6), 1341-1356 https://doi.org/10.1061/(ASCE)0733-9445(1987)113:6(1341)
  5. Chen, W.F. and Lui, E.M. (1991), Stability Design of Steel Frames, CRC Press, Boca Rton, FL
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피인용 문헌

  1. Effective lengths of braced frame columns vol.28, pp.2, 2008, https://doi.org/10.12989/sem.2008.28.2.189
  2. System buckling analysis for multi-story frames subjected to nonconservative forces vol.15, pp.2, 2015, https://doi.org/10.1007/s13296-015-6003-8
  3. Exact buckling load of a restrained RC column vol.27, pp.3, 2007, https://doi.org/10.12989/sem.2007.27.3.293
  4. Effective buckling length of steel column members based on elastic/inelastic system buckling analyses vol.26, pp.6, 2007, https://doi.org/10.12989/sem.2007.26.6.651
  5. Buckling of restrained steel columns due to fire conditions vol.8, pp.2, 2006, https://doi.org/10.12989/scs.2008.8.2.159