Corrosion and Initial Imperfections

Many modes of the application enable to perform the checks taking into account the corrosion. To do it, specify the corrosion layer thickness, or use the button , which invokes a dialog box where you should specify the data on the properties of corrosive medium, conditions of placement, its working life, the inclination angle of a member to the horizon, and the direction of the axes of inertia. It should be noted that in most cases the inclination angle of a member to the horizon does not have to be specified, since the application already has this information for beams, columns and truss members. A prediction of the corrosion layer thickness will be generated in accordance with:

A.I. Kikin, A.A. Vasiliev, B.N. Koshutin, V.Y. Uvarov, Y.L. Volberg. Increase of Metal Structures Durability for Industrial Buildings. — Moscow, “Stroyizdat”, 1984.

V.P. Koroliov. Theoretical principles of engineering analysis of steel structures for corrosion resistance and durability: Res. papers / Donetsk State Academy for Civil Engineering and Architecture.— Issue 1-95. Donetsk, 1995.— 108 p.

Gorochov E.V., Korolev V.P., Balkena A.A. / Durability of Steel Structures Under Reconstruction.— Rotterdam: Brookfield, 1999.— 305 p.

The analysis is based on the assumption that the thickness of the corrosion layer is the same along the whole perimeter of the section.

Moreover, you can specify not only the information on corrosion but also the values of initial imperfection for each truss member made from double angles. The behaviour analysis of such a damaged structure will be performed in accordance with the recommendations of the “Guide to design of reinforcing for steel structures (to SNiP II-23-81*)”, M., “Stroyizdat”, 1989. The analysis takes into account the possibility for the member with an initial imperfection to experience spatial buckling, therefore the set of factors generated in the result of the analysis may not include the results of in-plane or out-of-plane stability checks, or the results of both of these checks.