The Design Method of Major Parameters for Built-Up Columns

Built-up columns are widely used in engineering structure, but it is confusing for designers how to determine the parameters of built-up columns. The paper based on the user's basic needs which are the minimum working radius and working load, would simplify working load, support force and hoisting force to the vertex of built-up columns. From the origin of design, and to analyze mechanic behavior of built-up columns, and have found the relationship between internal forces, that is, the axial force, the swing force, the support force, and the working load. In accordance with design experience, the relationship between axial internal stress and its total working stress, critical stress and limit of yielding, had been respectively determined. According to this knowledge to determine the mass and the geometrical parameters of major cross-sections and roots of built-up columns, and a comparison between the results and ones of examples calculations were made, and it was found that the results are reasonable. This will offer a design method of determining the major parameters of built-up columns at the phase of the preliminary design, and improve the independent design capability.