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Out-of-plane buckling and bracing requirement in double-angle trusses

  • Chen, Shaofan (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Su, Mingzhou (School of Civil Engineering, Xi'an University of Architecture & Technology)
  • 투고 : 2002.04.24
  • 심사 : 2003.06.20
  • 발행 : 2003.08.25

초록

Truss members built-up with double angles back-to-back have monosymmetric cross-section and twisting always accompanies flexion upon the onset of buckling about the axis of symmetry. Approximate formulae for calculating the buckling capacity are presented in this paper for routine design purpose. For a member susceptible only to flexural buckling, its optimal cross-section should consist of slender plate elements so as to get larger radius of gyration. But, occurrence of twisting changes the situation owing to the weakness of thin plates in resisting torsion. Criteria for limiting the leg slenderness are discussed herein. Truss web members in compression are usually considered as hinged at both ends for out-of-plane buckling. In case one (or both) end of member is not supported laterally by bracing member, its adjoining members have to provide an elastic support of adequate stiffness in order not to underdesign the member. The stiffness provided by either compression or tension chords in different cases is analyzed, and the effect of initial crookedness of compression chord is taken into account. Formulae are presented to compute the required stiffness of chord member and to determine the effective length factor for inadequately constrained compressive diagonals.

키워드

참고문헌

  1. Cao, P.Z. (1983), "Flexural-torsional buckling calculation of axially compressed T-section members built-up with twin angles", Research report of Xi'an Institute of Metallurgy and Construction (in Chinese).
  2. Fisher, J.M. (1983), "The importance of tension chord bracing", AISC Engineering J., 3rd quarter 1983, 103-106
  3. Kennedy, J.B. and Murty, M.K.S. (1972), "Buckling of steel angles and T-struts", J. Struct. Div., P. ASCE, 98, ST. 11, 2507-2522.
  4. Marsh, C. (1997), "Design of single and multiple angle columns and beams", J. Struct. Engrg., 123(7), 848-856.
  5. Simitses, G.J. (1976), An Introduction to the Elastic Stability of Structures, Prentice-Hall, Englewood Cliffs.
  6. Timoshenko, S.P. and Gere J.M. (1961), Theory of Elastic Stability, 2nd ed., McGraw-Hill, NewYork.

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