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Author(s):	Hoffmeister, Benno; Wieschollek, Matthias; Kuhnhenne, Markus; Pyschny, Dominik
Title:
Abstract:	Die Bemessung und konstruktive Durchbildung von Trapezprofilen aus Stahl erfolgt in Deutschland gegenwärtig nach der noch gültigen Norm DIN 18807-3 (1987), die auf dem veralteten Bemessungskonzept mit globalem Sicherheitsbeiwert basiert und Verweise auf längst zurückgezogene Normen enthält. Im Rahmen der Überführung der Regeln aus DIN 18807 in die europäische Norm EN 1090-4 wurde die gegenwärtig vorhandene Regelung zu Öffnungen in Trapezprofilen, welche auf einem über 30 Jahre alten Technik- und Kenntnisstand basiert, hinterfragt. Dabei zeigen Untersuchungen, dass zahlreiche offene Fragen zur Anwendung der Bemessungsregeln und zur mechanischen Wirksamkeit der Abdeckbleche bestehen. Die zum Teil unklaren Regelungen und das Konzept der Lasterhöhungsfaktoren führen auf der einen Seite zu unwirtschaftlichen Lösungen, wenn sie befolgt und konservativ ausgelegt werden. Auf der anderen Seite führt das derzeitige Konzept bei Missachtung der Regeln (unwirksame Abdeckbleche als Verstärkungen, keine weiteren Maßnahmen) zu unsicheren Bemessungsergebnissen. Experimental validation of design rules for trapezoidal profiles with openings. Structural design and detailing of trapezoidal steel sheets in Germany currently follows the rules provided by the still valid National Standard DIN 18807-3 (1987). This Standard is based on the old design concept using one global safety factor and contains references to outdated codes which had been long since withdrawn. Within the framework of transition of design rules from DIN 18807-3 to the European Standard EN 1090-4 available provisions for openings in trapezoidal profiles, which exist since 30 years, were brought into question. The investigations regarding background information on these rules revealed a number of open questions concerning their application in practice as well as the mechanical performance of the cover plates. The basic concept for consideration of openings consists of the application of increased loads and verification using the complete cross-section of trapezoidal profiles. On the one head, several details regarding the application of this method are, however, not clearly specified leaving space for interpretations which may lead to non-economic results in case of over-conservative interpretation. On the other hand, non-safe results may be obtained if neglecting the increased loads while relying on the (non-existing) strengthening effect of the cover plates.
Source:	Stahlbau 86 (2017), No. 10
Page/s:	900-906
Language of Publication:	German

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