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MONITORING OF STRUCTURAL HEALTH AND DANGER STATE FOR SAFETY AND SUSTAINABILITY OF INFRASTRUCTURE SYSTEMS

Sigtryggsdóttir, Fjóla Guðrún
Doctoral thesis
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http://hdl.handle.net/11250/2360517
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2015
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Abstract
This dissertation is on monitoring of structural health and danger state for safety and

sustainability of infrastructure systems. It consists of a synopsis, in addition to journal and

conference papers and manuscripts.

The general considerations for structural health monitoring (SHM) of infrastructure systems

are introduced, as well as the monitoring of dangers relevant to structural safety. Danger state

monitoring (DSM) is defined along with related terms. The integration of these two

monitoring systems with consideration of multi-hazards is described and termed as structural

health and safety monitoring (SHSM). Next, the perspective of dams and reservoirs is

discussed, with an outline of geohazards and definition of a dam SHM. The case in Iceland of

Hálslón Reservoir and its dams is introduced. This case discusses the aspects of concrete faced

rockfill dams (CFRDs) in conjunction with the main dam. Finally, the synopsis is related to the

main research, which encompasses two studies, referred to as Study A and Study B.

Study A relates to elements of a dam SHM. The study focuses on the settlement behaviour of

Hálslón Reservoir’s main dam, a CFRD, statistical analysis of settlement data, and

development of a statistical prediction model considering visco-elasto-plastic constitutive

material models and unloading/reloading behaviour. The study brings forth the importance of

scrutinizing and processing raw readings and data from full-scale monitoring instrumentation.

It further shows that statistical analysis provides a means to compare responses from many

instruments at different locations. This comparison aids in defining trends in a data set,

seasonal components, changes in behaviour and/or outliers. Additionally, the analysis

produces details for a comprehensive understanding of dam settlement behaviour.

Study B relates to elements of DSM as well as SHSM with regard to multi-hazards. The study

focuses on geodangers that may threaten reservoirs and dams and the associated hazards

(termed geohazards). The planning and organization of a danger-monitoring program is

described and explained through the case of Hálslón Reservoir. Subsequently, geohazards and

their monitoring are defined in the general context of reservoirs and dams. A new

methodology is set out for enhancing safety by linking multi-source monitoring to multihazards

threatening infrastructure systems. An application of the methodology is demonstrated

with a conceptual model of two systems. One system includes the infrastructure, a reservoir

and its dams, along with settings for geohazards. The other system contains the associated

monitoring. Interrelations between and within the two systems are quantitatively explored by

applying an existing method of systems theory, extended to include multiple systems. This is

used to investigate hazard-triggering potential, interaction intensity and dominance. It is

further used to explore the reaction of monitoring components to geohazard action as well as

safety values of the monitoring system and its components. The interrelations established have

general relevance to reservoirs and dams. A case study illustrates these points. Moreover, the

interrelations can be used for defining hazard chains in multi-hazard assessment, planning of

monitoring programs and detecting precursory pathways within a monitoring system. The

methodology constitutes the basis for comprehensive safety and risk management, embracing

multi-hazard assessment as well as structural health monitoring.
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Doctoral thesis at NTNU;2015:142

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