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The evaluation of risk-targeted safety factor and behaviour factor for selected steel structures [Elektronski vir]
Celano, Francesca ; Žižmond, Jure ; Dolšek, Matjaž
Steel structures can often be essential components of petrochemical plants. Their function is to support complex system of pipes. Although quite severe accidents can occur in petrochemical plants, ...they are almost always designed by conventional force-based design, which is not based on the target risk/resilience. Recently new philosophy for force-based design was introduced. It makes it possible to incorporate the design for a target risk by using risk-targeted safety factor in the evaluation of the behaviour factor. In this paper, the procedure is applied to a set of simple steel moment resisting frames, considering different modelling approaches, different locations and different target probabilities of failure. Special attention is given to the evaluation of the overstrength factor, which has to be calculated on the basis of the design base share which is decisive for the selection of cross-section of structural elements. The risk-targeted behaviour factors presented in the paper are meant to fulfill the near collapse limit state without applying the damage limitation requirements. It is shown that so-determined q-factors are lower than those prescribed in Eurocode 8. The results showed that with a 50% reduction of the behavior factor, the target risk can be reduced up to around four times. The advantage of the proposed approach in comparison to the conventional approach is that the risk-targeted behaviour and safety factors can be estimated from a target risk for occurrence of a designated consequences, which may be particularly important for the design of critical infrastructure such as complex petrochemical plants.
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