|
iDEA: Drexel E-repository and Archives >
Drexel Academic Community >
College of Engineering >
Department of Civil, Architectural,and Environmental Engineering >
Faculty Research and Publications (CAEE) >
Limitations in structural identification of large constructed structures
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/2562
|
| Title: | Limitations in structural identification of large constructed structures |
| Authors: | Catbas, F.N.
Ciloglu, Suleyman Korhan
Hasancebi, O.
Grimmelsman, Kirk Alexander
Aktan, Ahmet Emin |
| Keywords: | Bridges, Long-Span
Finite Element Method
Vibration
Load Tests
Monitoring |
| Issue Date: | Aug-2007 |
| Publisher: | American Society of Civil Engineers |
| Citation: | Journal of Structural Engineering |
| Abstract: | The objective of this paper is to discuss the limitations in structural identification of large constructed structures. These
limitations arise due to the geometric complexity, uncertain boundary and continuity conditions, loading environment, and the imperfect
knowledge and errors in modeling such large constructed facilities. In this paper, the writers present their studies on developing a mixed
microscopic-structural element level three-dimensional finite-element FE modeling of a long-span bridge structure and its structural
system identification by integrating various experimental techniques. It is shown that a reasonable level of confidence 50–90% can be
achieved with a model that is calibrated using global and local structural monitoring data with a sufficiently high spatial resolution. The
reliability of the global attributes, such as boundary and continuity conditions that may be identified and simulated by means of
field-calibrated models using only dynamic test results globally calibrated models , may appear to be high as much as 90% . However,
the reliability that should be expected for local stress fields is shown to be an entirely different matter, and a calibration based on just
dynamic testing would be unable to reveal the confidence in simulated local responses. This is especially true for long-span bridges,
because the resolutions of the dynamic test grids are often quite sparse due to the large size of the structures. In this paper, the writers
illustrate that the density, modality, and bandwidth of experimental data should be carefully evaluated and matched to the size and
complexity of a constructed system before claiming that a FE model is validated. It is also shown that even more than three dozen
acceleration measurement points, two dozen strain measurements, and a continuous surveillance of wind and temperature were barely
sufficient for a credible structural identification of a long-span bridge. |
| URI: | http://dx.doi.org/10.1061/(ASCE)0733-9445(2007)133:8(1051)
http://hdl.handle.net/1860/2562 |
| Appears in Collections: | Faculty Research and Publications (CAEE)
|
Items in iDEA are protected by copyright, with all rights reserved, unless otherwise indicated.
|
www.drexel.edu
