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Use of vibration data for structural...
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Carleton University (Canada).
Use of vibration data for structural health monitoring of bridges.
紀錄類型:
書目-電子資源 : 單行本
正題名/作者:
Use of vibration data for structural health monitoring of bridges./
作者:
Londono, Nicolas A.
面頁冊數:
243 p.
附註:
Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5919.
Contained By:
Dissertation Abstracts International67-10B.
標題:
Engineering, Civil. -
電子資源:
Download PDF (下載PDF全文)
ISBN:
9780494182246
Use of vibration data for structural health monitoring of bridges.
Londono, Nicolas A.
Use of vibration data for structural health monitoring of bridges.
- 243 p.
Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5919.
Thesis (Ph.D.)--Carleton University (Canada), 2006.
Accurate and timely assessment of maintenance and repair requirements of bridges is important for ensuring public safety and for efficient allocation of limited resources by road transportation authorities. Periodic visual inspections have so far been the typical approach in assessing the condition of bridge structures. But the visual inspection approach is subjective as the results can vary from operator to operator, and it may fail to reveal hidden deficiencies that may affect the integrity of the inspected structures. Structural health monitoring (SHM) based on some form of structural response measurement has emerged as an alternative means to provide a quantitative and more accurate structural condition assessment. The techniques of monitoring vibration responses to ambient loads, such as wind and traffic are ideally suited for this purpose since theoretically any changes in stiffness due to damage or deterioration of the monitored structure are reflected in its vibration patterns. Furthermore, the monitoring of vibration responses of bridges to operational loads can be implemented cost effectively in relation to its potential benefits and does not lead to service disruptions.
ISBN: 9780494182246Subjects--Topical Terms:
1000005694
Engineering, Civil.
Use of vibration data for structural health monitoring of bridges.
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Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5919.
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Thesis (Ph.D.)--Carleton University (Canada), 2006.
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Accurate and timely assessment of maintenance and repair requirements of bridges is important for ensuring public safety and for efficient allocation of limited resources by road transportation authorities. Periodic visual inspections have so far been the typical approach in assessing the condition of bridge structures. But the visual inspection approach is subjective as the results can vary from operator to operator, and it may fail to reveal hidden deficiencies that may affect the integrity of the inspected structures. Structural health monitoring (SHM) based on some form of structural response measurement has emerged as an alternative means to provide a quantitative and more accurate structural condition assessment. The techniques of monitoring vibration responses to ambient loads, such as wind and traffic are ideally suited for this purpose since theoretically any changes in stiffness due to damage or deterioration of the monitored structure are reflected in its vibration patterns. Furthermore, the monitoring of vibration responses of bridges to operational loads can be implemented cost effectively in relation to its potential benefits and does not lead to service disruptions.
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This thesis presents and elaborates upon the different aspects of data manipulations involved in vibration-based SHM, including data processing, system identification, damage detection, and the development of computer tools to facilitate data analysis, visualization and interpretation of results. One of the main challenges in SHM using vibration data in practical applications in the field is the variability in the data arising from uncertainties in the environmental and loading operational conditions, as well as errors in modelling, measurement and computation, all of which can obscure the effects of damage or deterioration of the monitored structure. The question of whether the conditions of large complex civil engineering structures in the field can be realistically assessed using vibration response data has not so far been satisfactorily answered. This thesis examines this issue in detail using the monitoring data from the Confederation Bridge, in Canada. The Confederation Bridge is a large complex bridge located in a severe marine environment. The monitoring project of the Confederation Bridge provides the unique data used in this work to realistically assess the implications of the actual field observed variability of monitoring data on the feasibility of using vibration response data for structural condition assessment. The results obtained through a finite element updating damage detection algorithm indicate that continuous monitoring using multiple independent datasets is necessary to offset the errors arising from variability in the data to make it feasible to extract meaningful and useful information regarding the existence, location and magnitude of changes in stiffness associated with damage or deterioration from the monitoring data.
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Download PDF (下載PDF全文)
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