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Use of Structural Health Monitoring Data in Reliability-Based Analysis of Existing RC Corbel Considering Teflon Degredation
Structural Health Monitoring allows owners to measure their structures in response to changing load due to expected and unexpected movement and assess the effects of deterioration. Components such as corbels, which may be part of an expansion joint system in a concrete building, can be monitored by measuring relative movements. Corbels typically use a Teflon sliding surface to reduce the transfer of lateral load. The Teflon degrades with time, further increasing the lateral force on the corbel. The increasing force adversely affects corbel reliability (i.e., reduce the safety over time). The present case-study develops a rational framework to evaluate the effect of changing gravity load eccentricity on the structural reliability of existing corbels, where increasing degradation of the Teflon sliding surface, and the changing location of force on corbels, has become a concern within a multi-story institutional building. The proposed reliability framework incorporates structural health monitoring data, taken over 30 years, as a random variable for eccentricity in the reliability analysis. Monte Carlo Simulation is employed to calculate the reliability index of the corbel for the remaining service life. This includes a parametric study into the effects of reduced coefficient of friction of the Teflon, by taking a range of deterministic values. Results of the case study show the feasibility of using this framework to assess existing corbel safety over time, while also considering Teflon degradation.
Use of Structural Health Monitoring Data in Reliability-Based Analysis of Existing RC Corbel Considering Teflon Degredation
Structural Health Monitoring allows owners to measure their structures in response to changing load due to expected and unexpected movement and assess the effects of deterioration. Components such as corbels, which may be part of an expansion joint system in a concrete building, can be monitored by measuring relative movements. Corbels typically use a Teflon sliding surface to reduce the transfer of lateral load. The Teflon degrades with time, further increasing the lateral force on the corbel. The increasing force adversely affects corbel reliability (i.e., reduce the safety over time). The present case-study develops a rational framework to evaluate the effect of changing gravity load eccentricity on the structural reliability of existing corbels, where increasing degradation of the Teflon sliding surface, and the changing location of force on corbels, has become a concern within a multi-story institutional building. The proposed reliability framework incorporates structural health monitoring data, taken over 30 years, as a random variable for eccentricity in the reliability analysis. Monte Carlo Simulation is employed to calculate the reliability index of the corbel for the remaining service life. This includes a parametric study into the effects of reduced coefficient of friction of the Teflon, by taking a range of deterministic values. Results of the case study show the feasibility of using this framework to assess existing corbel safety over time, while also considering Teflon degradation.
Use of Structural Health Monitoring Data in Reliability-Based Analysis of Existing RC Corbel Considering Teflon Degredation
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Petrie, Connor (author) / Oudah, Fadi (author) / Norlander, Glen (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 27 ; 325-330
2022-04-14
6 pages
Article/Chapter (Book)
Electronic Resource
English
| European Patent Office | 2015