DYNAMIC PROPERTIES AND SERVICEABILITY LIMIT STATE OF FOOTBRIDGES IN MEXICO
DOI:
https://doi.org/10.18867/ris.106.535Keywords:
footbridges, ambient vibration tests, forced vibration tests, serviceability limit stateAbstract
Currently there is no structural design code for footbridges in Mexico. The effect of the passage of pedestrians on the design of footbridges is considered through a uniformly distributed static load that represents the weight of pedestrians crossing over the bridge deck. The associated serviceability limit state is not reviewed because it is not considered a dynamic load on the design. The new aesthetic trend consists in designing more slender and flexible footbridges that are more susceptible to the human induced vibration, since they generate harmonic frequencies that can coincide with some of the frequencies of the structure and therefore produce resonant vibrations that can exceed the limit of comfort supported by humans. The different international design standards suggest that this type of bridges must be designed in such a way that its structural frequencies of vibration are excluded from the range of frequencies generated by pedestrians, an also propose limit values of comfort acceleration that should not be exceeded. The result of the ambient vibration tests that were performed in seven footbridges built in Mexico are shown in this paper, as well as the results of the forced vibration tests carried out in two of them. An analytical study is made of the different structures and it is concluded that most of these structures do not satisfy the serviceability limit state.
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References
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