Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improved Bridge Load Capacity via Dynamic Train-Track-Bridge Interaction : Assessing the dynamic amplification factor caused by measured track irregularities for rail freight transport
The carbon impact of transportation is large and requires sustainable solutions. With expected population growth, rail transportation plays a vital role in facilitating a greener Europe. The expansion of the rail infrastructure is therefore of essential importance for future challenges. One key aspect to consider is the impact of track irregularities, which are imperfections in track geometry. These irregularities have a significant dynamic impact on bridge responses during train passage and are addressed in the regulations through a dynamic amplification factor (DAF) 𝜑′′. The design value of the DAF, suggested in the regulations, is based on simplified models during the 1970s. Previous studies have indicated an overestimation of the DAF and suggested lower DAF than the current regulations. However, these studies were conducted using synthetic mathematical generators for track irregularities. Consequently, there is now a growing interest in evaluating the factor based on real measurements of these irregularities. In general, decreasing DAF values could potentially enhance the capacity of existing bridges.This study aims to extend previous findings by investigating the impact of track irregularity amplitudes on the dynamic response of bridges, even when using real measurements to record these irregularities. It seeks to determine whether the standard deviation of the variation in the track geometry directly affects the bridge's dynamic responses. Additionally, the study aims to explore the correlation between dynamic bridge responses when track irregularities are generated from measurements versus using a Power Spectral Density (PSD) function. This investigation will provide insights into the accuracy of using PSD functions to model track irregularities in train-track-bridge interaction (TTBI) systems. Furthermore, the study aims to assess whether the dynamic amplification factor accounting for track irregularities is overly conservative in the design codes for short bridges. Previous research concluded a ...
Improved Bridge Load Capacity via Dynamic Train-Track-Bridge Interaction : Assessing the dynamic amplification factor caused by measured track irregularities for rail freight transport
The carbon impact of transportation is large and requires sustainable solutions. With expected population growth, rail transportation plays a vital role in facilitating a greener Europe. The expansion of the rail infrastructure is therefore of essential importance for future challenges. One key aspect to consider is the impact of track irregularities, which are imperfections in track geometry. These irregularities have a significant dynamic impact on bridge responses during train passage and are addressed in the regulations through a dynamic amplification factor (DAF) 𝜑′′. The design value of the DAF, suggested in the regulations, is based on simplified models during the 1970s. Previous studies have indicated an overestimation of the DAF and suggested lower DAF than the current regulations. However, these studies were conducted using synthetic mathematical generators for track irregularities. Consequently, there is now a growing interest in evaluating the factor based on real measurements of these irregularities. In general, decreasing DAF values could potentially enhance the capacity of existing bridges.This study aims to extend previous findings by investigating the impact of track irregularity amplitudes on the dynamic response of bridges, even when using real measurements to record these irregularities. It seeks to determine whether the standard deviation of the variation in the track geometry directly affects the bridge's dynamic responses. Additionally, the study aims to explore the correlation between dynamic bridge responses when track irregularities are generated from measurements versus using a Power Spectral Density (PSD) function. This investigation will provide insights into the accuracy of using PSD functions to model track irregularities in train-track-bridge interaction (TTBI) systems. Furthermore, the study aims to assess whether the dynamic amplification factor accounting for track irregularities is overly conservative in the design codes for short bridges. Previous research concluded a ...
Improved Bridge Load Capacity via Dynamic Train-Track-Bridge Interaction : Assessing the dynamic amplification factor caused by measured track irregularities for rail freight transport
Asaad, Muhannad (Autor:in)
01.01.2023
23565
Hochschulschrift
Elektronische Ressource
Englisch
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