Zum Trag- und Verformungsverhalten von Pin-Strukturen in Stahl-Beton-Verbundquerschnitten unter statischer Beanspruchung

  • Load-bearing and deformation behavior of pin structures in steel-concrete composite sections under static loads

Kopp, Maik; Feldmann, Markus (Thesis advisor); Hegger, Josef (Thesis advisor); Reisgen, Uwe Kaspar (Thesis advisor); Pak, Daniel (Thesis advisor)

1. Auflage. - Aachen : Mainz (2020)
Book, Dissertation / PhD Thesis

In: Schriftenreihe des Instituts für Stahlbau 89
Page(s)/Article-Nr.: xiv, 243, XVIII Seiten : Abbildungen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

Development of increasingly efficient materials allows for design structures of more filigree with unchanged component resistance in the ultimate limit state. In composite constructions, this effect is further increased by the optimum combination of concrete and structural steel. Constructive application limits of existing shear connectors, e.g. headed studs, restrict construction of slender components. For further optimization of composite structures small, powerful shear connectors are required that are able to transmit the increasing axial forces of the partial sections. The development of the CMT PIN welding process by Fronius enables the production of small metal pins. These few millimetres high pins are welded to the base material during the welding process and formed directly from the welding wire. The pins allow a rigid connection between metallic and non-metallic materials. The pin welding allows a similarly high degree of prefabrication compared to headed studs. Based on the PIN welding process, at first tests on the parameter, e.g. welding current and welding wire velocity, are carried out, which influence the welding process. The aim of these investigations is to further develop the pin geometry, in particular the pin height and the pin shank diameter, for use in steel-concrete composite constructions. For this, among other things, the welding parameters of the individual phases are varied and different wire diameters are used. In order to exclude defects, the pins are checked on the basis of macrosections and material tests.To determine the local load-bearing capacity, the slip capacity and to identify failure mechanisms shear and tension tests are performed on the enhanced pin geometries. The influence of the pin spacing is determined in a self-developed torsion test. The global bending resistance is investigated with the help of composite beams. The influence of concrete cracking on the load-bearing capacity and the slip capacity is tested with the aid of composite sheets. In addition, in component tests partial shear connections are investigated by varying both the number of pins and the shear span. Based on the investigations, statistically validated design equations are derived for the application of the pins in steel-concrete composite structures.

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