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The assessment of wind-induced vibrations is considered vital for the design of long-span bridges. The aim of this research is to develop a methodological framework for robust and efficient prediction strategies for complex aerodynamic phenomena using hybrid models that employ numerical analyses as well as meta-models. Here, an approach to predict motion-induced aerodynamic forces is developed using artificial neural network (ANN). The ANN is implemented in the classical formulation and trained with a comprehensive dataset which is obtained from computational fluid dynamics forced vibration simulations. The input to the ANN is the response time histories of a bridge section, whereas the output is the motion-induced forces. The developed ANN has been tested for training and test data of different cross section geometries which provide promising predictions. The prediction is also performed for an ambient response input with multiple frequencies. Moreover, the trained ANN for aerodynamic forcing is coupled with the structural model to perform fully-coupled fluid--structure interaction analysis to determine the aeroelastic instability limit. The sensitivity of the ANN parameters to the model prediction quality and the efficiency has also been highlighted. The proposed methodology has wide application in the analysis and design of long-span bridges.
What you are about to read is the very last issue of the ZMK. Since our overall research enterprise, the IKKM, has to cease all of its activities due to the end of its twelve years’ funding by the German federal government, the ZMK will also come to an end. Its last topic, Schalten und Walten has also been the subject of the concluding biannual conference of the IKKM, and we hope it will be a fitting topic to resume the research of the IKKM on Operative Ontologies.
Although this final issue is in English, we decided to leave its title in German: Schalten und Walten. As it is the case for the name of the IKKM, (Internationales Kolleg für Kulturtechnikforschung und Medienphilosophie), the term seems untranslatable to us, not only for the poetic reason of the rhyming sound of the words. Switching and Ruling might be accepted as English versions, but quite an unbridgeable difference remains. In German, Schalten und Walten is a rather common and quite widespread idiom that can be found in everyday life. Whoever, the idiom stipulates, is able to execute Schalten und Walten has the power to act, has freedom of decision and power of disposition.
Although both terms are mentioned together and belong together in the German expression Schalten und Walten, they are nevertheless complements to each other. They both refer to the exercise and existence of domination, disposal or power, but they nonetheless designate two quite different modes of being. Schalten is not so much sheer command over something, but government or management. It is linked to control, intervention and change, in short: it is operative and goes along with distinctive measures and cause-and-effect relations. The English equivalent switching reflects this more or less adequately.
Das Buch greift die enge Verknüpfung von Industrialisierung und
Urbanisierung auf, die in den letzten gut 250 Jahren Europas Städte und ihre Stadtbaugeschichte maßgeblich geprägt hat. Damit stellen sich auch vielfältige Fragen und Aufgaben für die Denkmalpflege.
Die Habilitationsschrift leistet einen Beitrag, um die stadtbaugeschichtlichen und stadtbildprägenden Werte historischer Industriekomplexe zu erkennen und zu erhalten. Wie können wir die industriellen Stadtlandschaften erfassen? Wie gestalten wir Umnutzungen und Konversionen denkmalgerecht und beziehen im Rahmen eines Heritage-Managements Aspekte der nachhaltigen Stadtentwicklung ein?