Dynamic Responses of a Metro Train-Bridge System under Train-Braking: Field Measurements and Data Analysis

Abstract

This paper focuses on the dynamic responses of a metro train–bridge system under train-braking. Experiments were performed on the elevated Metro Line 21 of Guangzhou (China). A continuous, three-span, rigid-frame bridge (42 m + 65 m + 42 m) and a standard B-type metro train were selected. The acceleration signals were measured at the center-points of the main span and one side-span, and the acceleration signals of the car body and the bogie frame were measured simultaneously. The train–bridge system’s vibration characteristics and any correlations with time and frequency were investigated. The Choi–Williams distribution method and wavelet coherence were introduced to analyze the obtained acceleration signals of the metro train–bridge system. The results showed that the Choi–Williams distribution provided a more explicit understanding of the time–frequency domain. The correlations between different parts of the bridge and the train–bridge system under braking conditions were revealed. The present study provides a series of measured dynamic responses of the metro train–bridge system under train-braking, which could be used as a reference in further investigations.

Numerical Investigation of the Characteristics of the Dynamic Load Allowance in a Concrete-Filled Steel Tube Arch Bridge Subjected to Moving Vehicles

“…e DLA is the regular parameter to express the impact effect of moving vehicles. In recent years, many useful conclusions have been obtained on the coupling vibration of different bridge types, such as metro train-bridge, short-span slab bridge, composite steel bridge, and so forth [9][10][11][12][13]. e DLA is the most important factor in the dynamic performance of bridges due to moving vehicles.…”