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  • Web application for determination of risk-targeted seismic action for force-based seismic design [Elektronski vir]
    Žižmond, Jure ...
    The procedure for estimating a target risk for adverse consequences of earthquakes should be developed in close cooperation with stakeholders and decision-makers who understand the high impact of the ... potential failure of industrial facilities on society and business state. However, the conventional procedures for earthquake-resistant design of critical infrastructures are not developed to such a level that would make it possible to use a target risk as an input parameter for designing the structures. This issue can be overcome by introducing the risk-based formulation for the evaluation of seismic design action for force-based design. In such an approach, the reduction factor depends on a target probability of exceedance of a designated limit state and takes into account the ground-motion randomness and uncertainty. In general, the formulation of the risk-targeted reduction factor depends on the code format for the reduction of seismic action. In this paper, the Eurocodes format of force-based design is used. Therefore, the reduction of seismic action is accounted for by the behaviour factor. Several structural parameters have to be assumed in order to estimate the risk-targeted behaviour as discussed in the paper. In virtue of poor knowledge concerning the nonlinear response of pipe rack piping systems, it is very challenging to appropriately assume these parameters. Thus, a reinforced concrete pipe rack, which represents a part of a liquified natural gas terminal, was firstly modelled and designed according to Eurocode 8 accounting for the low and high probability of earthquake recurrence aimed at designing the system for damage and life safety objective, respectively. The pipe rack, the piping system and the interaction of the pipe rack piping system with the adjacent storage tank were explicitly considered in the 3D model, which provided full dynamic coupling of the three components of the analysed system. The seismic performance assessment of the pipe rack and piping system was performed by the incremental dynamic analysis using a set of 11 spectrum compatible ground motions. Based on the results of IDA analysis, the design of pipe rack was evaluated on the safe side, however, the pipelines presented higher vulnerability due to a number of assumptions that are discussed. For the presented example, it was shown that the behaviour factor for the design of the pipe rack piping system is controlled by the performance of the pipes and not the structure supporting the pipes.
    Source: 17th World Conference on Earthquake Engineering [Elektronski vir] : September 13th to 18th 2020, Sendai, Japan (Str. 1-12)
    Type of material - conference contribution ; adult, serious
    Publish date - 2020
    Language - english
    COBISS.SI-ID - 29913603

    Link(s):

    http://www.17wcee.jp/program.php#_proceedings

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