The effect of fishing basin construction on the behaviour of a footbrdge over the port channel

• Autorzy: Pyrzowski Ł. , Miśkiewicz M. , Chróścielewski J.
• Języki publikacji: EN

Abstrakty

EN

The paper analyses possible causes of failure of the rotating footbridge over the Ustka port channel. In July, 2015, strange behaviour of this object was observed in the form of excessive vibrations of bridge platform suspension rods, with the accompanying acoustic effects. A preliminary geotechnical analysis has revealed that this destructive effect was caused by the nearby construction works, namely construction of a fishing basin and communication routes in the area close to the bridge, which affected the bridge lashing rod foundation settings. Ground vibrations generated by certain construction activities were likely to have direct impact on decreasing the bearing capacity of these rods and increasing the susceptibility od the piles to extraction. After detecting the above problems in bridge operation, its geodetic monitoring was started. The data recorded during this monitoring, along with the results of force measurements in the rods, have made the basis for a series of numerical simulations, performed in the Finite Element Method (FEM) formalism. The bridge structure was analysed in the conditions defined as the emergency state. Extreme efforts of bridge elements and its dynamic characteristics were examined. A possible source of strange behaviour of the footbridge during its operation which was recognised during these simulations was the coincidence of the global natural frequency of the entire bridge structure with local vibrations of suspension rods, at the frequency approximately equal to 1 Hz. This situation was likely to lead to the appearance of the so-called internal resonance phenomenon. As a final conclusion of the research, recommendations were formulated on possible object oriented corrective actions.

Słowa kluczowe

EN

footbridge; port basin; failure

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2017
• Tom: S 1
• Strony: 182--187
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Pyrzowski Ł.

• Gdansk University of Technology Faculty of Civil and Environmental Engineering 11/12 Narutowicza St. 80 - 233 Gdańsk Poland

autor

Miśkiewicz M.

• Gdansk University of Technology Faculty of Civil and Environmental Engineering 11/12 Narutowicza St. 80 - 233 Gdańsk Poland

autor

Chróścielewski J.

• Gdansk University of Technology Faculty of Civil and Environmental Engineering 11/12 Narutowicza St. 80 - 233 Gdańsk Poland

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)