Considerations for seismic ratcheting

This paper describes recent research conducted to understand the effects of structural characteristics\non seismic ratchetting of structures. From analyses conducted of cantilever structures with fibre\nhinges representing steel and reinforced concrete structures, it was shown that as the difference in\nstrength in the forward and reverse directions increased, the tendency for increased seismic\ndisplacements in one direction increased. Ratcheting of the model representing steel structures was\nsignificantly greater than that of the model representing reinforced concrete structures. From the\nresults obtained, simple recommendations are provided for use in structural earthquake standards.