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On the influence of constructional elements on the dynamic behaviour of filler beam railway bridges -Part 1: Introduction and measurements on filler beam bridges. Enhancements of the European railway system are amongst other things mainly characterized by increased usage of high speed trains and significantly raised operating speeds. To predict effects of train loading on railway bridges for a dynamic design adequately, knowledge of the system's significant dynamic characteristics is required. Only this ensures that resonance effects, which generally cannot be screened out for high speeds, can be covered analytically by reliable values. Measurements especially carried out on filler beam bridges have shown though that a realistic estimation of eigenfrequencies of bridges is difficult. Actual values and measured ones differ significantly in many cases. In particular non-consideration of structural constraints is seen as reason for this, given that they have an immense effect on a bridge's stiffness and damping characteristics. This first part of the contribution gives a brief survey on the dynamics of high-speed railway bridges. Furthermore results from measurements on filler beam railway decks are presented. In the forthcoming second part of the contribution the influence of particular constructional elements on the dynamic behaviour of filler beam bridges is investigated, supported by numerical studies. Finally the main outcomes are discussed and proposals for an improved dynamic bridge design are made. Einführung 1.WIB-Eisenbahnbrücken
On the influence of constructional elements on the dynamic behaviour of filler beam railway bridges -Part 1: Introduction and measurements on filler beam bridges. Enhancements of the European railway system are amongst other things mainly characterized by increased usage of high speed trains and significantly raised operating speeds. To predict effects of train loading on railway bridges for a dynamic design adequately, knowledge of the system's significant dynamic characteristics is required. Only this ensures that resonance effects, which generally cannot be screened out for high speeds, can be covered analytically by reliable values. Measurements especially carried out on filler beam bridges have shown though that a realistic estimation of eigenfrequencies of bridges is difficult. Actual values and measured ones differ significantly in many cases. In particular non-consideration of structural constraints is seen as reason for this, given that they have an immense effect on a bridge's stiffness and damping characteristics. This first part of the contribution gives a brief survey on the dynamics of high-speed railway bridges. Furthermore results from measurements on filler beam railway decks are presented. In the forthcoming second part of the contribution the influence of particular constructional elements on the dynamic behaviour of filler beam bridges is investigated, supported by numerical studies. Finally the main outcomes are discussed and proposals for an improved dynamic bridge design are made. Einführung 1.WIB-Eisenbahnbrücken
Wesentliche Teile unserer Infrastruktur wurden durch die intensive Bautätigkeit in den 1950er bis 1970er Jahren erschaffen. Zahleiche Bauwerke im Bestand sind allerdings “in die Jahre gekommen” und entsprechen nicht mehr uneingeschränkt dem heutigen Stand der Technik. Im vorliegenden Beitrag wird am Beispiel von zwei vorgespannten Eisenbahnrahmenbrücken gezeigt, wie durch differenzierte Betrachtung und eine behutsame Ertüchtigung eine nachhaltige und wirtschaftliche Nutzung dieser Bauwerke in einem weiteren Lebenszyklus möglich ist.
Brücken im Bereich des Hochgeschwindigkeitsverkehrs sind teilweise aufgrund der hohen dynamischen Beanspruchungen mit möglicherweise auftretender Resonanz außerhalb unseres bisherigen Erfahrungsbereiches. Mit dieser Problematik ist bereits im Entwurfsstadium äußerst sensibel umzugehen. Es genügen manchmal nur kleine konstruktive Kniffe, um das dynamische Verhalten zu verbessern. In folgendem Beitrag werden für diese Bauwerke insbesondere die Fragen der zutreffenden Modellierung der Einwirkungen und des Tragwerkes sowie die Bewertung der Berechnungsergebnisse beispielhaft anhand mehrerer Großbauvorhaben sowie anhand von Bestandsbauwerken angesprochen. Dabei werden nicht nur die Probleme der Tragfähigkeit sondern auch die der Ermüdungssicherheit diskutiert, da sowohl die Schwingbeiwerte als auch die Betriebslastfaktoren bei Resonanz nicht mehr zutreffend sind. Experiences with modeling and evaluation of railway bridges with risk of resonance. So far no experiences could be accomplished with bridges in the field of high‐speed trains due to high stresses with possible appearances of resonance. This issue has to be treated very sensitive from the design stage on. Little tricks will help to improve the dynamic performance. This contribution deals with the modeling of the impacts and the structure of the high speed train bridges as well as the evaluation of results of calculations. Problems of ultimate limit strength and fatigue strength are being discussed for some examples because dynamic factors as well as working load factors are no longer correct if resonance is occuring.
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