oa Civil Engineering = Siviele Ingenieurswese - Evolution of an approximate analysis technique for unbraced steel frames

Volume 26, Issue 12
  • ISSN : 1021-2000



The fundamental principles of a new approximate method of analysis for unbraced rigid frames are presented. The method makes use of a multi-curve interaction principle placing the failure load on the one hand and a load related to the elastic buckling load on the other hand. The failure curves between those extreme values are empirical. In this study they have been tested against 19 steel frame structures from previous research and 11 model frames specifically designed for the purpose of this investigation. In general, a better correlation with exact solutions was recorded than could be obtained from existing similar interaction techniques. Considering the simple application of the procedure, notably if the required elastic analysis components are further approximated, the method could become a useful tool for the engineer when designing sway frames.

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