SIMPLIFIED SEISMIC DRIFT ANALYSIS OF HIGH-RISE STEEL FRAMES

A general method is presented of lateral instability analysis for castellated beams using the principle of minimum potential energy. The applications to particular cases is described. Several experiments available from the literature provide information for selecting the deformed configuration which satisfies the conditions of both statics and geometry at the boundary; certain idealizations are then made to characterize the geometrical features necessary for the purpose of analysis. Equations are presented which provide the solution for lateral buckling of castellated beams under uniform load and concentrated load at mid-span, respectively. These equations include the solution for the external load when it is applied on the top flange, as the mid-depth longitudinal axis or suspended from the bottom flange. It is observed that the critical load depends upon several parameters represnting the geometrical features of castellated beams. In the case of commercially available products, the relations between critical loads and the governing parameters can be plotted with the help of the derived formulas (for convenient use in practical design). The method described here is simple and enables a closed form presentation of answers in precise expressions.

  • Availability:
  • Corporate Authors:

    American Institute of Steel Construction

    101 Park Avenue
    New York, NY  USA  10017
  • Authors:
    • Fleischer, W H
  • Publication Date: 1974-6

Media Info

  • Features: References; Tables;
  • Pagination: p. 53-64
  • Serial:
    • Engineering Journal
    • Volume: 2
    • Issue Number: 3
    • Publisher: American Institute of Steel Construction
    • ISSN: 0013-8029

Subject/Index Terms

Filing Info

  • Accession Number: 00260999
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM