Frequency Response Function Based Finite Element Model Updating.
dissertation presents the development and application of a frequency response function
based finite element model updating method. The societal problem that this research
hopes to address is the continually aging infrastructure of the United States,
particularly bridges. The method presented combines the usefulness of commercially
available finite element modeling programs with... read moreadvanced optimization techniques to
solve the inverse problem in a robust and elegantly simple form. The method is applied
to a simulated bowstring truss, where all stiffness, mass, and damping parameters are
simultaneously identified. Grouping and ungrouping proved to be a successful technique
to aid the method in detecting, locating, and quantifying change in structural
parameters. A benchmark structure is then used to show the usefulness of the method to
accurately detect change in structural properties of a physical structure with
measurements. This example shows the robustness of the method in the presence of real
modeling and measurement errors. Model calibration using measurements from the intact
structure is an essential part of the process to mitigate incorrect assumptions made
during modeling. The final application of the method is finite element model calibration
of a full scale bridge using measurements from a dynamic bridge test. Issues of
observability and identifiability of structural parameters are fully explored prior to
calibration of the finite element modeling. Creating a refined finite element model was
essential to the success of the model calibration. The hope of the author is that the
methods and techniques presented here can be used in bridge structural health monitoring
programs in the future.
Thesis (Ph.D.)--Tufts University, 2013.
Submitted to the Dept. of Civil Engineering.
Advisor: Masoud Sanayei.
Committee: Erin Bell, Babak Moaveni, Ron Lasser, and Jim Moore.
Keyword: Civil engineering.read less