%O This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
%T Influence of atmospheric corrosivity on the seismic fragility of low-code steel frame structures
%I International Society for Structural Health Monitoring of Intelligent Infrastructure (ISHMII)
%L discovery10195607
%D 2024
%C Turin, Italy
%S International Conference on Resilience, Earthquake Engineering and Structural Health Monitoring (ICONREM)
%K Existing steel frame, Atmospheric corrosion, Corrosivity Categories, Local engineering demand parameters, Fragility curves
%V 3
%A Devang Lad
%A Fabio Freddi
%A Jayadipta Ghosh
%X 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.
%B Proceedings of the 3rd International Conference on Resilience, Earthquake Engineering and Structural Health Monitoring (ICONREM 2024)