This paper investigates the dynamic characteristics and behavior of a historic suspension footbridge through experimental and numerical studies. Ambient vibration tests were performed on the footbridge to extract the modal parameters of the structure such as natural frequencies, damping ratios, and mode shapes. The modal properties were...
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2023 (v1)PublicationUploaded on: February 14, 2024
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2020 (v1)PublicationNumerical validation of the generalized equivalent spectral model through crowd dynamics simulations
This paper aims to provide a validation of the Generalized Equivalent Spectral Model of pedestrian-induced loading through numerical simulations of crowd dynamics. Pedestrian flows with varying density are numerically simulated based on the social force model. The instantaneous step frequency of each pedestrian is obtained from his...
Uploaded on: April 14, 2023 -
2021 (v1)Publication
Despite extensive research in the field of human-induced vibration in the last twenty years, there is still lack of reliable load and response models to assess vibration serviceability of footbridges under human-induced excitation, especially with reference to crowded conditions. This paper aims to provide a reliable characterization of...
Uploaded on: April 14, 2023 -
2022 (v1)Publication
Experimental and numerical studies for the structural and vibration serviceability assessment of a historic suspension footbridge adopting non-invasive surveys and low-cost equipment are presented. Field surveys have been carried out to determine geometric properties, ambient vibration tests have been performed to estimate the dynamic...
Uploaded on: February 22, 2023 -
2022 (v1)PublicationDynamic response of floors induced by a single walking pedestrian including walking path variability
This paper proposes a general non-dimensional closed-form solution to calculate the dynamic response of simply supported rectangular floors crossed by a single pedestrian schematized as a deterministic moving multi-harmonic load. The critical walking paths, which can provide the maximum vibration response, are identified and then a simplified...
Uploaded on: February 22, 2023 -
2020 (v1)Publication
This paper discusses different strategies for the extraction of the time-varying mean from wind speed time histories. Due to the advantage of allowing analytical evaluations, the attention is focused on kernel regression techniques, considering different weighting functions, namely a constant, a Gaussian and a cardinal sine weighting function....
Uploaded on: October 11, 2023 -
2024 (v1)Publication
The current design guidelines for assessing floor vibration performance rely on a simplified approach that considers a single pedestrian as a fixed load with multiple harmonic components applied to the anti-nodes of the floor mode shapes. However, these guidelines do not account for the influence of variability in the walking path on the...
Uploaded on: February 4, 2024 -
2019 (v1)Publication
A continuous Timoshenko linear beam model immersed in a three-dimensional space is introduced to study the static and dynamic behavior of tower buildings. A schematization of the building as a periodic system with rigid floors connected by deformable elements (columns and shear walls) is considered. The rigid floors are endowed with six degrees...
Uploaded on: March 27, 2023 -
2020 (v1)Publication
This paper discusses the serviceability assessment of footbridges considering the uncertainties in definition of their structural and loading parameters. Application of the Taylor Series Expansion method to the closed-form expression of the dynamic response based on the Equivalent Spectral Model allows to obtain analytical solutions for the...
Uploaded on: April 14, 2023 -
2020 (v1)Publication
This paper studies serviceability assessment of footbridges through a non-deterministic approach. The parameters defining pedestrian-induced loading and the structural dynamic properties are characterized through possible ranges of variation. Starting from analytical expressions for the spectral moments of the structural response, the improved...
Uploaded on: April 14, 2023 -
2022 (v1)Publication
The study aims to estimate the maximum dynamic response of linear elastic SDOF systems subjected to thunderstorm outflows. Starting from a recently developed Evolutionary Power Spectral Density (EPSD) model for the wind velocity, the dynamic response is decomposed into a time-varying mean and a non-stationary random fluctuation. The EPSD and...
Uploaded on: April 14, 2023