Thesis supervisor: Attila László Joó
Location of studies (in Hungarian): BME Hidak és Szerkezetek Tanszéke Abbreviation of location of studies: BMEHS
Description of the research topic:
Vehicle loads on bridges cause additional stresses on its structural elements, which can be considered by static loads and dynamic factors. To determine the real behavior, it is possible to perform dynamic on-site tests. Such tests have been performed by the Department of Structural Engineering on many domestic bridges, but those data are not organized or systematically evaluated. Further problem of the on-site tests is that it provides information on very limited number of points on the structure, primarily from the points where strain gauges have been placed. However these results can be used for time-dependent dynamic analysis to obtain comprehensive picture of the dynamic effects of structural elements of different bridge types. By the more accurate understanding of the dynamic effect, it is possible to refine the dynamic factors and thus to design more economical bridge structures.
The aim of the PhD research is to clarify the dynamic factors of bridges as follows. 1) Modeling of trams/trains/vehicles for railway and road bridges as well and different bridge types as complex dynamic systems for explicit dynamic finite element analysis. 2) Determination of the dynamic characteristics of real railway and road vehicles. 3) Various vibration and road conditions (dilatation height difference, unevenness, elevation and horizontal alignment) vehicle-bridge interaction study based on time-dependent dynamic analyses, statistical evaluation of the results. 4) Evaluation of the on-site test results of previous tests of the Department of Structural Engineering, modeling the bridges, verifying the results of the dynamic analysis by the results of the on-site tests. 5) Overview of the interpretation methods of dynamic factors based on new results of all structural elements and all structural points containing large number of data. 6) Determination of the probability (probability increase) of damage caused by dynamic effects in case of strength, stability and fatigue failure. 7) Determination of dynamic factors on probability method for different bridge types and their structural elements.
Number of students who can be accepted: 1
Deadline for application: 2024-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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