In the recent years gabled frames have been widely used in the industrial buildings. The stability analysis of these types of structures is very important. The buckling analysis of two dimensional elastic frames and gabled frames have been widely studied in the last decades. By studying three-dimensional gabled frames, the importance of the structural behavior other than flexural mode in stability analysis has been found.

In this paper the mathematical formulation and the computer implementation of the elastic stability analysis of symmetric structures is presented. Solutions in the forms of tables, charts, and approximate formations for the buckling load are presented for a varity of beam and column geometries, end restraints and loading conditions. The critical loads corresponding to various buckling modes are plotted versus nondimensionalized parameters in an effort to establish the parameter range at which lateral, flexural or torsional buckling controls.

Since it is practically impossible to nondimensionalize the many parameters in the member sections of the gabled frames considered, solutions were obtained for a range of beam and column members used in present-day practice. The loading consists of concentrate load and uniform bending loads. The end restraints are applied at the end of the columns with fixed, pinned, roller and pinned connection with rotational spring.

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