Abstract
The paper presents the experimental and numerical results of the dynamic system identification and verification of the behavior of two footbridges in Poland. The experimental part of the study involved vibration testing under different scenarios of human-induced load, impulse load, and excitations induced by vibration exciter. Based on the results obtained, the identification of dynamic parameters of the footbridges was performed using the peak-picking method. With the impulse load applied to both structures, determination of their natural vibration frequencies was possible. Then, based on the design drawings, detailed finite element method (FEM) models were developed, and the numerical analyses were carried out. The comparison between experimental and numerical results obtained from the modal analysis showed a good agreement. The results also indicated that both structures under investigation have the first natural bending frequency of the deck in the range of human-induced excitation. Therefore, the risk of excessive structural vibrations caused by pedestrian loading was then analysed for both structures. The vibration comfort criteria for both footbridges were checked according to Sétra guidelines. In the case of the first footbridge, the results showed that the comfort criteria are fulfilled, regardless of the type of load. For the second footbridge, it was emphasized that the structure meets the assumptions of the guidelines for vibration severability in normal use; nevertheless, it is susceptible to excitations induced by synchronized users, even in the case of a small group of pedestrians.
Highlights
Dynamic loads are among the most dangerous and unpredicted threats that can be observed in the case of civil engineering structures [1,2,3]
To the relatively low the mass of the container filledapplied with water and vibration exciter, notDue affect the relatively low mass the container filled with water and vibration exciter, they did which not affect the the frequencies and theofmode shapes obtained
The experimental and numerical results of the dynamic system identification and verification of the behavior of two footbridges in Poland have been presented in this paper
Summary
Dynamic loads are among the most dangerous and unpredicted threats that can be observed in the case of civil engineering structures [1,2,3]. In order to assess the behavior of the structure, and the risk of occurrence of excessive vibrations, whether at the design or the operation stage, knowledge of its basic dynamic characteristics is mandatory These modal quantities are natural frequencies, damping ratios, and mode shapes. Based on theverified obtained time parameters oftime bothhistories, footbridges considered in were byacceleration comparing tested anfrom impulse load andthe excitations induced by light vibration exciter, so as to identify histories, it was possible to assess level of comfort. The comfort criteria for both footbridges based on the Subsequently, the results from the numerical analysis and the field test are compared and discussed in accelerations obtained in field tests were assessed.
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