Steel savings in an industrial building column with account for effect of crane girder stiffness

Abstract

Introduction. Construction science always seeks to save materials, including in the design of steel frameworks. Currently, in modern construction standards, structural analysis of frameworks for industrial buildings, namely their columns, is carried out without considering the stiffness of the crane girder which receives the load from the overhead crane. However, this factor can give a certain economy of metal, since the stiffness of crane structures directly affects the stability of columns of industrial buildings, and therefore the metal consumption of the framework.Aim. To achieve savings of steel due to taking into account the effect of crane girder stiffness on the stability of an industrial building framework.Materials and methods. For these purposes, the authors of the paper used classical methods of structural mechanics. A programmed cyclic algorithm of the Mathcad software was used to find the critical forces and effective length coefficients at various stiffnesses of the column elements. Columns of an industrial building are usually two-member. Given that, its structural design is twice statically indeterminate by the deflection method. The bearing capacity of an industrial building column is found by deriving the critical force, which is determined from the equation obtained by setting equal to zero the stability determinant consisting of the coefficients of the linear equation system by the deflection method. In addition, the effective length coefficient for the upper and lower parts of the column is determined. The paper compares the results obtained with the scheme without taking into account the crane girder.Results. Considering the effect of the crane girder stiffness enabled the material consumption of the column to be reduced by 30 %. Critical forces and effective length coefficients were found at various stiffnesses of the column elements, using a programmed cyclic algorithm of the Mathcad software.Conclusion. Taking into account the stiffness in the structures of the elements in the industrial building frameworks reduces metal consumption.