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Abstract:	Herrn Prof. Dr.-Ing. Peter Schaumann zum 65. Geburtstag gewidmet Im Zentrum des Beitrags stehen Untersuchungen zum Tragverhalten zentrisch belasteter Stahlstützen bei erhöhten Temperaturen. Nach einer Beschreibung des generellen Tragverhaltens im Brandfall werden Imperfektionsbeiwerte vorgeschlagen, die für H-Querschnitte eine sichere Bemessung bei Anwendung des gegenwärtigen Nachweisformats der DIN EN 1993-1-2 ermöglichen. Die Imperfektionsbeiwerte wurden mithilfe abgesicherter numerischer Berechnungsmodelle für Temperaturen zwischen 100 °C und 700 °C entwickelt. Ein Vergleich zeigt, dass die Verwendung des Imperfektionsbeiwerts der Norm zu unsicheren Ergebnissen führt, wenn der Fall “Knicken um die schwache Achse” betrachtet wird. Dahingegen sind die Ergebnisse für niedrigere Temperaturen (< 300 °C) zum Teil unwirtschaftlich. Ergänzend werden aus den Imperfektionsbeiwerten geometrische Ersatzimperfektionen abgeleitet, die für den Brandfall eine Berechnung nach Elastizitätstheorie II. Ordnung ermöglichen. Design of steel columns in case of fire This article covers the assessment of the load carrying behavior of centrically loaded columns made of double symmetric H-sections at elevated temperatures. After a short description of the general load carrying behavior in the event of fire, imperfection factors are presented which allow a reliable design using the current model of DIN EN 1993-1-2. The imperfection factors were developed with the help of validated numerical calculation models for temperatures between 100 °C and 700 °C. A comparison shows that using the imperfection factors of the code leads to unsafe results when “buckling perpendicular to the weak axis” is considered. Whereas, the results for lower temperatures (< 300 °C) are partly uneconomical. In addition, geometrical imperfections are derived from the imperfection factors, which allow a second order analysis with elastic material behavior.
Source:	Stahlbau 88 (2019), No. 12
Page/s:	1136-1143
Language of Publication:	German

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