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

用于轻工业、商业和娱乐用途的低层钢结构建筑占加拿大建筑存量的很大一部分。这些建筑物大多数位于太平洋沿岸以及圣劳伦斯河和渥太华河沿岸地震活跃度中等的地区。对于此类建筑，加拿大国家建筑规范对各种抗震系统（SFRS）的设计提出了容量设计理念，预计在地震等严重动态激励下会出现非弹性响应。在这种类型的事件中，延性 SFRS 中的应变率往往非常高，这导致材料的行为与缓慢加载时不同。因此，在这种情况下设计和/或数值模拟结构的响应时不考虑应变率可能会导致对结构的预期行为和预期失效模式得出错误的结论。

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.