Modern footbridges are lively structures, often sensitive to human-induced actions. Thanks to new technologically advanced materials and innovative structural computational techniques, modern footbridges are ever more flexible and lightweight. The high slenderness, often coupled with low values of structural damping, leads to high levels in structural vibrations and, consequently, to problems for the comfort of pedestrians. Classic static procedures are not reliable for this typology of structures, resulting necessary a dynamic approach to the design. The present paper is mainly addressed to technical users. It offers a brief but comprehensive view of the state of the art on the assessment of human-induced vibrations on footbridges. Starting from the characterization of the human-induced actions, the main loading scenarios, to which a footbridge can be subjected during its lifetime, are discussed. Therefore two dynamical issues related to pedestrian bridges are considered: the evaluation of comfort levels, and the transversal instability analysis. For both these problems, the main methodologies available in literature are provided and critically analyzed. Finally, a schematic procedure for the correct dynamic analysis of footbridges is proposed as a summary of the information provided.
Ponti Pedonali - Valutazione delle vibrazioni indotte dall'uomo
FERRAROTTI, ALBERTO;PICCARDO, GIUSEPPE;TUBINO, FEDERICA
2015-01-01
Abstract
Modern footbridges are lively structures, often sensitive to human-induced actions. Thanks to new technologically advanced materials and innovative structural computational techniques, modern footbridges are ever more flexible and lightweight. The high slenderness, often coupled with low values of structural damping, leads to high levels in structural vibrations and, consequently, to problems for the comfort of pedestrians. Classic static procedures are not reliable for this typology of structures, resulting necessary a dynamic approach to the design. The present paper is mainly addressed to technical users. It offers a brief but comprehensive view of the state of the art on the assessment of human-induced vibrations on footbridges. Starting from the characterization of the human-induced actions, the main loading scenarios, to which a footbridge can be subjected during its lifetime, are discussed. Therefore two dynamical issues related to pedestrian bridges are considered: the evaluation of comfort levels, and the transversal instability analysis. For both these problems, the main methodologies available in literature are provided and critically analyzed. Finally, a schematic procedure for the correct dynamic analysis of footbridges is proposed as a summary of the information provided.
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