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Study and Application of Modern Bridge Monitoring Techniques
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The field of monitoring is one of rapid development. Advances in sensor technologies, in data communication paradigms and data processing algorithms all influence the possibilities of Structural Health Monitoring, damage detection, traffic monitoring and other implementations of monitoring systems. Bridges are a very critical part of a country’s infrastructure, they are expensive to build and maintain, and many uncertainties surround important factors determining the serviceability and deterioration of bridges. As such, bridges are good candidates for monitoring. Monitoring can extend the service life and avoid or postpone replacement, repair or strengthening work. Many bridges constitute a bottleneck in the transport network they serve with few or no alternative routes. The amount of resources saved, both to the owner and the users, by reducing the amount of non-operational time can easily justify the extra investment in monitoring.

This thesis consists of an extended summary and three appended papers. The thesis presents advances in sensor technology, damage identification algorithms and Bridge Weigh-In-Motion techniques. Two case studies are carried out. In the first a bridge and traffic monitoring system is implemented in a highway suspension bridge to study the cause of unexpected wear in the bridge bearings. In the second a fully operational Bridge Weigh-In-Motion system is developed and deployed in a steel railway bridge. The gathered data was studied to obtain a characterization of the site specific traffic.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , viii, 35 p.
Series
Trita-BKN. Bulletin, ISSN 1103-4270 ; 110
Keyword [en]
Structural Health Monitoring, Traffic Monitoring, Bridge Monitoring, Bridge Weigh-In-Motion, BWIM, Damage Detection, Suspension Bridge Bearings, Axle Loads, Dynamics
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-48583OAI: oai:DiVA.org:kth-48583DiVA: diva2:458107
Presentation
2011-12-12, 13:00
Opponent
Supervisors
Note
QC 20111122Available from: 2011-11-22 Created: 2011-11-21 Last updated: 2011-11-22Bibliographically approved
List of papers
1. A review of recent development in structural health monitoring of bridges
Open this publication in new window or tab >>A review of recent development in structural health monitoring of bridges
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Bridges are expensive to manage as they require thorough inspection and maintenance operations. Meanwhile the development of Structural Health Monitoring (SHM) techniques in recent years have demonstrated the potential for this to become a tool that bridge managers can use to optimise inspection and maintenance procedures. This paper reviews recent development in SHM and damage detection techniques. The paper focuses on recent algorithms developed or adapted for damage detection and structural health monitoring in bridge structures, although some of the algorithms presented might be of a more general nature or developed for other kind of structures. The algorithms presented are classified according to the method they use for damage detection and location into Acoustic Emission, Modal Analysis and Statistical pattern recognition based.

 

Publisher
16 p.
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-48686 (URN)
Available from: 2011-11-22 Created: 2011-11-22 Last updated: 2011-11-22Bibliographically approved
2. Continuous monitoring of bearing forces and displacements  on the high coast suspension bridge
Open this publication in new window or tab >>Continuous monitoring of bearing forces and displacements  on the high coast suspension bridge
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This paper presents results from the longitudinal girder displacement and bearing force monitoring on a highway suspension bridge located in Sweden. The monitoring programme was initiated in 2005 by the bridge owner after the discovery of unusual and intense wear in the Teflon layers of the bearings. The initial work focused mainly on a long term monitoring of the bearing forces in the northern abutment. After the first monitoring period of one year the monitoring system was enhanced with a traffic camera, a temperature sensor and accelerometers mounted on the two hangers closest to the instrumented bearing. The monitoring period presented in this paper covers ten months from February to December 2010 and focuses on the horizontal displacement of the girder and on the forces registered in the north-west bearing in conjunction with the traffic information provided by the traffic camera.

National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-48704 (URN)
Available from: 2011-11-22 Created: 2011-11-22 Last updated: 2011-11-22Bibliographically approved
3. Traffic monitoring using a structural health monitoring system
Open this publication in new window or tab >>Traffic monitoring using a structural health monitoring system
2014 (English)In: Proceedings of the ICE - Bridge Engineering, ISSN 1478-4629, Vol. 168, no 1, 13-23 p.Article in journal (Refereed) Published
Abstract [en]

The main factors influencing the deterioration of bridges are the environmental conditions and the traffic loads. Hence, a reliable and accurate characterisation of the traffic loads can improve the results from bridge rating, and health bridge monitoring. In this study a Bridge Weigh-in-Motion algorithm is developed to monitor trains passing on a steel railway bridge. The implemented system estimates the traffic loads, speeds and axle spacings. Other valuable information such as peak and RMS vertical bridge deck accelerations are also stored. The system takes advantage of two of the strain gauges from a previously deployed sensor network, installed to mainly monitor the strains for fatigue development. In this paper the possibilities and limitation of this system are explored.

National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-48707 (URN)10.1680/bren.11.00046 (DOI)2-s2.0-84924428646 (Scopus ID)
Note

QC 20150625

Available from: 2011-11-22 Created: 2011-11-22 Last updated: 2015-06-25Bibliographically approved

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Citation style
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