Characterisation and advanced modeling of multidimensional strain-rate effects on structural steels for enhanced seismic design of building structures in Canada

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Low-rise steel buildings used for light industrial, commercial, and recreational purposes, represent a vast proportion of the building stock in Canada. Most of these buildings are located in regions of active and moderate seismicity levels on the Pacific coast and along the St-Lawrence and Ottawa rivers. For this type of building, the National Building Code of Canada imposes a capacity design philosophy for the design of various seismic force resisting systems (SFRS), for which inelastic response is anticipated under severe dynamic excitation such as earthquakes. During this type of event, the strain-rates in ductile SFRS tend to be very high which causes the material to behave differently than when loaded slowly. For this reason, not taking into account strain-rates when designing and/or numerically simulating the response of a structure in such context might lead to erroneous conclusions on the structure's expected behaviour and expected modes of failure.