Sökning: "Bridge dynamics"

Visar resultat 6 - 10 av 88 avhandlingar innehållade orden Bridge dynamics.

1. 6. Train–Bridge Interaction : Literature Review and Parameter Screening

   Författare :Therese Arvidsson; Raid Karoumi; Costin Pacoste; Weiwei Guo; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; vibration; railway bridge; bridge deck acceleration; moving load; train–bridge interaction; vehicle model; Civil and Architectural Engineering; Byggvetenskap;

   Sammanfattning : New railway lines are continuously being constructed and existing lines are upgraded. Hence, there is a need for research directed towards efficient design of the supporting structures. LÄS MER

3. 7. Train–Track–Bridge Interaction for the Analysis of Railway Bridges and Train Running Safety

   Författare :Therese Arvidsson; Raid Karoumi; Andreas Andersson; Costin Pacoste; Guido De Roeck; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; railway bridge; bridge deck acceleration; train–bridge interaction; vehicle model; wheel–rail force; running safety; Civil and Architectural Engineering; Byggvetenskap;

   Sammanfattning : In this thesis, train–track–bridge interaction (TTBI) models are used to study the dynamic response of railway bridges. A TTBI model considers the dynamics of the train in addition to that of the track–bridge system. The TTBI model enables the assessment of train running safety and passenger comfort. LÄS MER

4. 8. Vibration mitigation of high-speed railway bridges : Application of fluid viscous dampers

   Författare :Sarah Tell; Raid Karoumi; Ülker-Kaustell Mahir; Andreas Andersson; Bill F. Jr. Spencer; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamics; vibration mitigation; railway bridge; high-speed trains; bridge deck acceleration; passive damping; fluid viscous dampers; retrofit; dynamik; vibrationsdämpning; järnvägsbro; höghastighetståg; brobaneacceleration; passiv dämpning; viskösa dämpare; eftermontering; Byggvetenskap; Civil and Architectural Engineering;

   Sammanfattning : At the moment of writing, an expansion of the Swedish railway network has started, by constructions of new lines for high-speed trains. The aim is to create a high-speed connection between the most populous cities in Sweden - Stockholm, Göteborg and Malmö, and the rest of Europe. LÄS MER

5. 9. End-Shield Bridges for High-Speed Railway : Full scale dynamic testing and numerical simulations

   Författare :Hesham Elgazzar; Jean-Marc Battini; Mahir Ülker-Kaustell; Morgan Johansson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-speed railway; end-shield bridges; structural dynamics; soil structure interaction; full scale bridge testing; controlled forced excitation; hydraulic bridge exciter; frequency response function; Civil and Architectural Engineering; Byggvetenskap;

   Sammanfattning : The increasing need for High-Speed Railway (HSR) to reduce the travelling time requires increasing research within this field. Bridges are main components of any railway network, including HSR networks, and the optimization of their design for this purpose would contribute to a faster and more cost effective development of the HSR network. LÄS MER

7. 10. An X-ray Based Spectroscopic Study of Structure Influencing Electrons : Fragmentation, Ultrafast Charge Dynamics and Surface Composition

   Författare :Geethanjali Gopakumar; Olle Björneholm; Carl Caleman; Isaak Unger; Ruth Signorell; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fragmentation; ICD; ETMD; Ultrafast electron dynamics; Surface propensity;

   Sammanfattning : The structure of biomolecules, such as proteins, is intimately connected to the function of the molecules. These structures are often studied using X-ray diffraction. However, the interaction of the X-ray photons with the molecule can excite or ionize its electrons which in turn can causes changes in the molecular structure. LÄS MER