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| Titel |
Monitoring the dynamic behaviors of the Bosporus Bridge by GPS during Eurasia Marathon |
| VerfasserIn |
H. Erdoğan, B. Akpınar, E. Gülal, E. Ata |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 14, no. 4 ; Nr. 14, no. 4 (2007-08-16), S.513-523 |
| Datensatznummer |
250012247
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| Publikation (Nr.) |
 copernicus.org/npg-14-513-2007.pdf |
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| Zusammenfassung |
| Engineering structures, like bridges, dams and towers are designed by
considering temperature changes, earthquakes, wind, traffic and
pedestrian loads. However, generally, it can not be estimated that these
structures may be affected by special, complex and different loads. So it
could not be known whether these loads are dangerous for the structure and
what the response of the structures would be to these loads. Such a situation
occurred on the Bosporus Bridge, which is one of the suspension bridges
connecting the Asia and Europe continents, during the Eurasia Marathon on 2 October
2005, in which 75 000 pedestrians participated. Responses of the
bridge to loads such as rhythmic running, pedestrian walking, vehicle passing during
the marathon were observed by a real-time kinematic (RTK) Global Positioning
System (GPS), with a 2.2-centimeter vertical accuracy. Observed responses were
discussed in both time domain and frequency domain by using a time series
analysis. High (0.1–1 Hz) and low frequencies (0.00036–0.01172 Hz) of observed
bridge responses under 12 different loads which occur in different
quantities, different types and different time intervals were calculated in
the frequency domain. It was seen that the calculated high frequencies are
similar, except for the frequencies of rhythmic running, which causes
a continuously increasing vibration. Any negative response
was not determined, because this rhythmic effect continued only for a short
time. Also when the traffic load was effective, explicit changes in the bridge
movements were determined. Finally, it was seen that bridge frequencies
which were calculated from the observations and the finite element model were
harmonious. But the 9th natural frequency value of the bridge under all
loads, except rhythmic running could not be determined with observations. |
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