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Title: Strain-based monitoring methods for beam-like structures
Authors: Sigurdardottir, Dorotea Hoeg
Advisors: Glisic, Branko
Contributors: Civil and Environmental Engineering Department
Keywords: Deformed Shape
Fiber-Optic Sensors
Long-Gauge Strain Sensors
Neutral Axis Location
Steel and Concrete Bridges
Structural Health Monitoring
Subjects: Civil engineering
Issue Date: 2015
Publisher: Princeton, NJ : Princeton University
Abstract: In this thesis Structural Health Monitoring (SHM) is defined as the process of periodically or continuously measuring structural parameters over time and the consequent analysis, with the aim of providing actionable information on structural performance. This work is motivated by the need for network-wide SHM of typical structures. Strain based SHM methods are explored with the main focus on the location of neutral axis and the deformed shape of beam-like structures. SHM methods for evaluation of these two parameters are developed, including detailed uncertainty analyses. Additionally, an exploration of several other parameters is presented through a case study. Strain data from two full-scale in-service structures, a large-scale test structure, and a laboratory specimen were used to validate the methods and assess their limitations. The main conclusions are that: 1) repeated short-term measurements are ideal, since they are less influenced by temperature and rheological effects; 2) the neutral axis location varies in healthy structures and it is sensitive to damage and other unusual structural behaviors; 3) uncertainty in the deformed shape was predicted prior to data acquisition; and 4) for vertical displacement evaluations, a detailed analysis of the boundary conditions is necessary.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Civil and Environmental Engineering

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