Abstract
This paper discusses overload behaviour and sudden failure in concrete structures. It shows that even concrete structures with very good ductility can fail suddenly, ie without prior large deflections to warn of the imminent collapse. Softening in the overload range, rather than ductility, is the necessary structural property that ensures adequate warning of collapse. The current design provisions in AS 3600 need to be extended to address the important issues of sudden failure, ductility and softness at overload.
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