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Traffic Induced Vibrations at Road-Bridge - Experimental and Numerical Analysis

Baggens, Oskar (2012) In TVSM
Civil Engineering
Structural Mechanics
Abstract
In the north-east part of Lund, Sweden, the MAX IV facility is (in the event of writing this thesis) under construction. MAX IV is a synchrotron radiation facility which has a high requirement regarding low vibrations.

Within this thesis a nearby road-bridge for the highway E22 was studied using experimental and numerical methods. The aim was to determine the magnitude of the road-bridge influence to the ground vibrations during passages of vehicles and thereby possibly explain the high levels of vibrations which have been measured during occasional events.

A finite element model of the road-bridge and surrounding soil was created
using the software Abaqus. Material and soil-layering properties were defined according to a database... (More)
In the north-east part of Lund, Sweden, the MAX IV facility is (in the event of writing this thesis) under construction. MAX IV is a synchrotron radiation facility which has a high requirement regarding low vibrations.

Within this thesis a nearby road-bridge for the highway E22 was studied using experimental and numerical methods. The aim was to determine the magnitude of the road-bridge influence to the ground vibrations during passages of vehicles and thereby possibly explain the high levels of vibrations which have been measured during occasional events.

A finite element model of the road-bridge and surrounding soil was created
using the software Abaqus. Material and soil-layering properties were defined according to a database which have been created during previous geotechnical studies. Geometry of the road-bridge was defined according to construction drawings.

The model was studied in two types of analysis; a steady-state and a transient analysis. The transient analysis was based on a load-case which was created in CALFEM/MATLAB using a simple standard axle model which was connected to a continuous beam model. A comparison between measurement data and modelling result was made. The comparison showed that the measured and predicted displacements of the road-bridge during a passage of a vehicle were approximately in the same magnitude.

Calculation of 1 s RMS levels of the vibration for the transient load-case at a specific point in the ground, identical to a stationary seismometer location, was done. The 1 s RMS value were below 20 nm in all three directions. It was therefore concluded that the suggested transient load-case not could explain the high levels of vibrations(>200 nm 1s RMS > 5 Hz) which had been measured previously.

Although the transient load-case approximated the passage of a vehicle fairly well it was concluded that a more refined load-case and model were needed in order to continue the investigation. (Less)
Please use this url to cite or link to this publication:
author
Baggens, Oskar
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
TVSM
report number
TVSM-5184
ISSN
0281-6679
language
English
id
3567006
date added to LUP
2013-03-21 13:18:22
date last changed
2013-09-06 11:56:18
@misc{3567006,
  abstract     = {In the north-east part of Lund, Sweden, the MAX IV facility is (in the event of writing this thesis) under construction. MAX IV is a synchrotron radiation facility which has a high requirement regarding low vibrations.

Within this thesis a nearby road-bridge for the highway E22 was studied using experimental and numerical methods. The aim was to determine the magnitude of the road-bridge influence to the ground vibrations during passages of vehicles and thereby possibly explain the high levels of vibrations which have been measured during occasional events.

A finite element model of the road-bridge and surrounding soil was created
using the software Abaqus. Material and soil-layering properties were defined according to a database which have been created during previous geotechnical studies. Geometry of the road-bridge was defined according to construction drawings.

The model was studied in two types of analysis; a steady-state and a transient analysis. The transient analysis was based on a load-case which was created in CALFEM/MATLAB using a simple standard axle model which was connected to a continuous beam model. A comparison between measurement data and modelling result was made. The comparison showed that the measured and predicted displacements of the road-bridge during a passage of a vehicle were approximately in the same magnitude.

Calculation of 1 s RMS levels of the vibration for the transient load-case at a specific point in the ground, identical to a stationary seismometer location, was done. The 1 s RMS value were below 20 nm in all three directions. It was therefore concluded that the suggested transient load-case not could explain the high levels of vibrations(>200 nm 1s RMS > 5 Hz) which had been measured previously.

Although the transient load-case approximated the passage of a vehicle fairly well it was concluded that a more refined load-case and model were needed in order to continue the investigation.},
  author       = {Baggens, Oskar},
  issn         = {0281-6679},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVSM},
  title        = {Traffic Induced Vibrations at Road-Bridge - Experimental and Numerical Analysis},
  year         = {2012},
}