Απόκριση συστημάτων με τμηματικά γραμμική ακαμψία υπο μεταβατικές διεγέρσεις
Response of piecewise linear systems under transient excitations
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Autor
Πέρρος, Κυριάκος Κ.Supervisor name
Παπαδημητρίου, Κωνσταντίνος
Datum
2009Language
en
Access
free
Zusammenfassung
This work investigates the response of a class of nonlinear elastic systems with
piecewise linear characteristics, arising in mechanical and civil engineering
applications. The study focuses on civil engineering applications related to the
response of bridges equipped with elastomeric bearings for isolation of the structure,
as well as seismic stoppers in order to resist strong earthquake base motions. In the
present study these systems are represented by single degree of freedom structural
models with piecewise linear elastic stiffness elements. In order to gain useful insight
into the behavior of these systems, the behavior of single degree of freedom piecewise
linear elastic mechanical models is first investigated under short duration sine pulse
excitation. Then, the response of such system under long duration transient earthquake
excitations is discussed. The analysis is concentrated on deterministic response
spectra characteristics and the estimation of the sensitivity of these spectra to system
and loading parameters such as stiffness ratio, gap sizes between deck structure and
stoppers, excitation strength and frequency content. It is shown that the performance
of such systems to transient excitation can be enhanced by optimally designing the
system parameter values.
Academic publisher
Πανεπιστήμιο Θεσσαλίας. Πολυτεχνική Σχολή. Τμήμα Μηχανολόγων Μηχανικών.