The present reliability analysis of a reinforced concerete column is an extension of previus reliability studies of columns designed according to Durocodes 1 and 2. Simpler stochastic models considered for variable actions beforehand are superseded here by more realistic square wave (jump) processes with intermittencies. Each process is characterised by a jump rate (an average number of magnitude changes) and interarrival-duration intensity (a multiple of the arrival rate and the mean duration). Considering a reference time interval 50 years the results are compared with time invariant anslysis and results of previous time variant reliability studyies. It appears that refined time variant reliability analysis with intermittencies may considerably improve reliability assessment of structures, particularly those exposed to variable actions of relatively short duration.
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