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Author(s):	Weiher, Hermann; Runtemund, Katrin; Ullerich, Christof
Title:
Abstract:	Mithilfe einer mehrmonatigen zerstörungsfreien Monitoringmaßnahme an zwei Rampenbauwerken der Köhlbrandbrücke, Hamburg, wurde die Ermüdungsbruchgefahr des Spannstahls an den Spannstahlkopplungen infolge Verkehr- und Temperaturbelastung bauwerksbezogen beurteilt und bewertet. Hierzu wurden im Zeitraum August 2013 bis August 2014 dynamische Rissbreitenmessungen am Überbauquerschnitt im Bereich der Koppelfugen sowie Temperaturmessungen zur Bestimmung der Temperaturverteilung über den Querschnitt durchgeführt. Ziel des Monitorings war es, den tatsächlichen Bauwerkszustand orts- und objektspezifisch zu erfassen. Im theoretischen Nachweiskonzept konservativ anzunehmende Parameter (z. B. örtliche Spannkraftverluste, Temperaturgradient) können so durch realistische Ansätze präzisiert werden. Im Rahmen dieses Beitrags werden das entwickelte Monitoringkonzept, die Messergebnisse und deren Implementierung in den rechnerischen Nachweis vorgestellt. Monitoring based proof of fatigue resistance of prestressing steel at coupling joints of the Köhlbrandbrücke With the help of a non-destructive monitoring of two structures of the eastern ramp of the Köhlbrandbrücke, Hamburg, the danger of fatigue fracture of prestressing steel of coupling joints due to traffic and temperature loading has been assessed and evaluated. To this aim, dynamic measurements of the crack movements and of the temperature distribution over the cross section were carried out in the period August 2013 to August 2014. The aim of the monitoring was to detect the actual state of the structure and to specify in the theoretical verification concept conservatively assumed parameters (e.g. local stress losses, temperature gradient) by site and object specific approaches. Within the framework of this paper the developed monitoring concept, the measurement results and their implementation in the theoretic verification are introduced and discussed.
Source:	Beton- und Stahlbetonbau 110 (2015), No. 8
Page/s:	529-538
Language of Publication:	German

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