Calibration of the numerical model of a track section over a railway bridge based on dynamic tests

Experimental dynamic tests and numerical simulations of a 3 meters long segment of a footbridge made of polymer composites are presented in the paper. The span-length is reduced, however dimensions of cross-section are the same as the target footbridge. The segment structure is made of sandwich panels, which consist of fibre reinforced polymer (GFRP) laminates (skins) and a PET foam (core). The first part of the paper contains description and results of experimental dynamic tests, which were subjected to the structure. The excitations during these tests was realised by a group of people standing or jumping on the structure deck. The obtained results allowed to determine natural frequencies as well as damping ratios. Moreover, cyclic loading was applied to the structure deck to check the possibility of delamination or debonding occurrence, as a result of repetitive dynamic excitations. The second part contains validation of numerical model - results of numerical analysis and its comparison with the experimental ones.

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Investigation of Dynamic Response of a Railway Bridge Equipped with a Tailored SHM System

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.569-570.1068 ◽

2013 ◽

Vol 569-570 ◽

pp. 1068-1075

Author(s):

Przemysław Kołakowski ◽

Arkadiusz Mroz ◽

Damian Sala ◽

Piotr Pawłowski ◽

Krzysztof Sekuła ◽

...

Keyword(s):

Numerical Model ◽

Health Monitoring ◽

Data Transfer ◽

Structural Condition ◽

Strain Sensors ◽

Railway Bridge ◽

Piezoelectric Strain ◽

Dynamic Excitations ◽

Term Objective

A railway bridge has been the object of investigation in the context of structural health monitoring (SHM). The current work is focused on utilization of experimental data for refining a numerical model of the structure as well as on tests of dynamic excitations using a controlled hydraulic shaker and passing trains. The numerical model has been matched to experimental measurements using experimental modal analysis - classical and operational. The tailored SHM system for monitoring of the bridge consists of 15 piezoelectric strain sensors taking advantage of wireless communication for data transfer. Experimental responses of the bridge collected by the SHM system are confronted with the ones produced by the FE numerical model of the bridge. The long-term objective of the investigation is to elaborate a method for assessment of structural condition and prediction of remaining lifetime of the bridge.

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Progressive numerical model validation of a bowstring-arch railway bridge based on a structural health monitoring system

Journal of Civil Structural Health Monitoring ◽

10.1007/s13349-020-00461-w ◽

2021 ◽

Author(s):

Andreia Meixedo ◽

Diogo Ribeiro ◽

João Santos ◽

Rui Calçada ◽

Michael Todd

Keyword(s):

Numerical Model ◽

Structural Health Monitoring ◽

Monitoring System ◽

Model Validation ◽

Health Monitoring ◽

Railway Bridge ◽

Health Monitoring System ◽

Structural Health ◽

Structural Health Monitoring System

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Research on Influence of Deep Foundation Pit Excavation and Dewatering on Pile Foundation of Railway Bridge

E3S Web of Conferences ◽

10.1051/e3sconf/202128301019 ◽

2021 ◽

Vol 283 ◽

pp. 01019

Author(s):

Liu Tianyun ◽

Yu Changyi ◽

Zhu Nan

Keyword(s):

Numerical Model ◽

Pile Foundation ◽

Three Dimensional ◽

Railway Bridge ◽

Deep Foundation ◽

Foundation Pit ◽

Deep Foundation Pit ◽

Maximum Settlement ◽

Limit Value ◽

Construction Optimization

The three-dimensional numerical model of the foundation pit engineering is established, and the fluid-structure coupling method is used to calculate the settlement of the pile foundation of the adjacent railway bridge caused by the excavation and dewatering of the foundation pit. The results show that the settlement range of the soil around the foundation pit reaches 140m, and the pile foundation of the railway bridge is within the influence range, but the maximum settlement value does not exceed the limit value specified in the design. The method used in this paper provides effective guidance for the construction optimization of the same type of projects and reduces the project cost.

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Experimental Validation of a Numerical Model for the Dynamic Analysis of a Bowstring Arch Railway Bridge

IABSE Congress Report ◽

10.2749/222137908796292731 ◽

2008 ◽

Vol 17 (12) ◽

pp. 302-303

Author(s):

Diogo RIBEIRO ◽

Rui CALÇADA ◽

Raimundo DELGADO

Keyword(s):

Numerical Model ◽

Dynamic Analysis ◽

Experimental Validation ◽

Railway Bridge

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Modeling Progressive Settlement of a Railway Bridge Transition

2016 Joint Rail Conference ◽

10.1115/jrc2016-5715 ◽

2016 ◽

Author(s):

Stephen T. Wilk ◽

Timothy D. Stark

Keyword(s):

Numerical Model ◽

Three Dimensional ◽

Surface Profile ◽

Railway Bridge ◽

Wheel Load ◽

Bridge Abutment ◽

The Impact

This paper illustrates the impact of progressive settlement on a railway bridge transition using a three-dimensional dynamic numerical model that includes the train truck, rails, ties, ballast, subgrade, and bridge abutment and structure. A settlement law that relates tie load to ballast settlement is presented and demonstrated using an iterative fashion to evaluate bridge transition response to 28 MGT. The results illustrate: (1) development of the commonly observed dip about 2.5 to 3.7 m (8 to 12 feet) from the entrance bridge abutment, (2) tie-ballast gaps progressively increase in height and expand to ties outwards from the bridge abutment, (3) a redistribution of load to ties outwards from the bridge abutment as tie-ballast gaps develop and increase, and (4) a ballast surface profile that attempts to minimize tie loads by evenly distributing the wheel load amongst adjacent ties.

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