Lad, Devang;
Freddi, Fabio;
Ghosh, Jayadipta;
(2024)
Influence of atmospheric corrosivity on the seismic fragility of low-code steel frame structures.
In:
Proceedings of the 3rd International Conference on Resilience, Earthquake Engineering and Structural Health Monitoring (ICONREM 2024).
International Society for Structural Health Monitoring of Intelligent Infrastructure (ISHMII): Turin, Italy.
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Abstract
Low-code steel moment-resisting frames (pre-Northridge) are characterised by high seismic vulnerability due to their reduced ductility capacity. Moreover, these structures are exposed to atmospheric corrosion deterioration due to environmental corrosive agents. Corrosion deterioration leads to section mass loss, stiffness degradation, and loss of energy dissipation capacity, among others. Thus, based on the corrosive category, old steel structures could experience considerable variations in their seismic performance. The present study examines the effect of different corrosivity categories on the seismic vulnerability of steel frames. A non-seismically designed three-storey moment-resisting frame is selected for case-study purposes and exposed to increasing corrosivity categories (C3, C4, C5, and CX) as per ISO 9223: 2012. As per ISO 9224:2012, atmospheric corrosion is assessed considering a 50-year ageing time and uniform corrosion. The seismic performance of the pristine and ageing steel frames is evaluated through Incremental Dynamic Analyses (IDAs) considering a suite of 43 ground motion records to account for the record-to-record variability. The seismic performance under different exposure categories is evaluated by monitoring local and global engineering demand parameters (EDPs), allowing the development of seismic fragility functions at components- and system-levels.
| Type: | Proceedings paper |
|---|---|
| Title: | Influence of atmospheric corrosivity on the seismic fragility of low-code steel frame structures |
| Event: | 3rd International Conference on Resilience, Earthquake Engineering and Structural Health Monitoring (ICONREM 2024) |
| Location: | Turin |
| Dates: | 24 Jun 2024 - 27 Jun 2024 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://www.symposium.it/en/events/2024/iconrem-20... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Existing steel frame, Atmospheric corrosion, Corrosivity Categories, Local engineering demand parameters, Fragility curves |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10195607 |
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