Einfluss von Querkraftanschlüssen auf das Biegedrillknicken von Einfeldträgern - Teil 1: Wissenschaftlicher Hintergrund

Hinged connections are an often used type of connection between secondary and primary beam with flushed upper flanges. A very economic type of connection in terms of manufacturing and erection are long fin-plates. Unfortunately they are no fork bearing, therefore the usual formula for the elastic critical moment M_cr for beams cannot be used. To design a beam according to DIN EN 1993-1-1 it is necessary to know the actual stiffness of such connections to be able to consider it in the calculation of M_cr. This is also the case for other typical hinged connections like notched beams with either fin-plate or double angle connection. This problem of otherwise very economic connections is the reason for taking a closer look at their influence on the lateral-torsional buckling in the research project AiF-No. 16872 N at the Lehrstuhl für Metallbau der Technischen Universität München (Chair of Metal Structures at the TU München). The following first part of the paper deals with the scientific background.