DIN EN 1993-1-1-konforme integrierte Stabilitätsanalysen für 2D/3D-Stahlkonstruktionen (Teil 2)

DIN EN 1993-1-1 based integrated stability analysis of 2D/3D steel structures (part 2).

This paper - as the second of a series of three parts - presents within chapters 8 until 10 the benefits of the "General Method" (DIN EN 1993-1-1/clause 6.3.4) with regard to steel structures, which are vulnerable towards 3D-lateral bending and torsional instabilities. The concurrent method of theory 2nd order including the warping and using initial deformations (either as initial bows or as eigenshape equivalent) is also applied for comparison. Various examples illustrate their easiness of application as well as its profitability and mostly superiority versus the well known conventional methods of subdividing complex steel structures into small substructures (mostly single members) to check the lateral torsional buckling behavior. ConSteel -developed as an integrated system for optional 2D and 3D steel and composite structures- offers the necessary software base to compute all parameters and additionally to perform the required checks of the "General Method". Chapter 7 complements the benchmark examples from the first part [44], i.e. ConSteel even computes correctly the eigenshapes of members with continuous high rotational spring support. This is particularly required with application of theory 2nd order including the warping using equivalent initial deformations. Chapter 11 concludes this second part with studies of stabilizing effects of 3D-bracings. Investigations into the 3D stability calculation and checks will become main focus of the third part (presumably presented in STAHLBAU 5/2014). This last part will deal with more complex 3D structures (e.g. industrial buildings) particularly concerning impacts of eccentricities of loading, connections, supports and the spatial interaction of sub-structures under stability checks.