Eisenbahnüberführung Simmerbach

Abstract

Die VFT‐Rail Pilotbrücke über den Simmerbach wird im Rahmen einer Bauartzulassung durch Feldmessungen überwacht. Die Überwachung umfasst sowohl statische Zuglasten als auch Überfahrten eines Messzuges wie auch des Regelverkehrs. Ein Schwerpunkt der Messungen sind die direkt auf dem Überbau angeordneten Schienenstützpunkte, insbesondere beim Übergang zum Schotterbett am Brückenende. Das Bemessungsverfahren der Verbunddübel der externen Bewehrung des Brückensystems wird anhand von gemessenen Nennspannungen der Stahlprofile überprüft und bewertet.Railway bridge Simmerbach – Monitoring of the composite dowels and the rail fasteners in the VFT‐Rail system. A monitoring system is installed at the VFT‐Rail pilot bridge over the Simmerbach Valley within the scope of the licensing procedure. It surveys static train loads and dynamic crossings of a test train and of the regular train loads. The focus of the monitoring is set on the rail fastening system of the non‐ballast superstructure near the transition to the normal ballast track. The design concept of the composite dowels implemented in the external reinforcement of the bridge is assessed by measuring the nominal stresses in the steel sections.

Composite dowels as shear connectors for composite beams – background to the German technical approval

“…3. Bridges with composite dowels: Simmerbach [2] (left) and road bridge at Pöcking [3] (right) stirrups must be installed (see section 3.1.4). This prevents pry-out at the lower concrete surface.…”

“…Cyclic pry-out can be prevented by limiting the upper load to 70 % of the characteristic static loadbearing capacity according to Eqs. (1) and (2). Up to this load level, the loadbearing behaviour is regarded as mainly elastic.…”

Condition monitoring of VFT‐Rail® slab‐track railway bridges

“…The first railway bridge using the VFT-Rail ® system was built in 2012 in the course of track section 3511 between Bingen and Saarbrücken in Germany [1]. It replaced two existing steel troughs with ballast bed which had reached the end of their lifespan.…”

“…These calculations are based on national railway codes "Ril 804 Module 5404" [6] and "Ril 804 Module 5405" [7], which are not compulsory. A detailed description of the design principles is given in [1].…”

Concrete fatigue in composite dowels

“…a), pry‐out failure (b) and vertical concrete splitting (c) can occur, whereas the steel dowel may fail due to combined shear and bending stresses (d) . Besides their use in building construction (), where they are mainly exposed to static loading, composite dowels are particularly prevalent in engineering structures and bridge construction (), where the cyclic traffic loads may cause fatigue processes in the composite connection. The few existing studies documented in the literature () have dealt mainly with the fatigue processes of the steel dowel, whereas the concrete fatigue behaviour has been disregarded.…”