Elsevier

Fire Safety Journal

Volume 27, Issue 4, November 1996, Pages 305-334
Fire Safety Journal

Fire safety design based on calculations: Uncertainty analysis and safety verification

https://doi.org/10.1016/S0379-7112(96)00050-1Get rights and content

Abstract

Evacuation life safety in a one-room public assembly building has been analysed with regard to uncertainty and risk. Limit state equations have been defined, using response surface approximations of output from computer programmes. A number of uncertainty analysis procedures have been employed and compared: the analytical first-order second-moment (FOSM) method, two numerical random sampling procedures (simple random sampling and Latin hypercube sampling) and standard PRA method. Eight scenarios have been analysed in isolation as well as aggregated into an event tree, with branches denoting functioning/failing protection system (alarm, sprinkler and emergency door). Input parameter distributions have been subjectively quantified and classified with respect to category: knowledge or stochastic uncertainty. Risk assessment results comprise probability of failure pf, reliability index β and CCDF (complementary cumulative distribution function) for evacuation time-margin deficit. Of special interest is the calculation of confidence intervals for the distribution of CCDFs obtained by the two-phase Monte Carlo sampling procedure, allowing a distinction between knowledge and stochastic uncertainty. The importance analysis carried out analytically gives data of fundamental significance for an understanding of the practical design problem. Partial coefficients have been treated only by calculating values implicit or inherent in a few existing sample design configurations. Future studies, preferrably using optimization procedures, are needed to produce generally valid values.

References (20)

  • Performancebased firesafety requirements and technical guidelines for the calculation process (in Danish)

    Nordic Committee for Building Regulation Working Report 07

    (1994)
  • S.E. Magnusson et al.

    Fire safety design based on calculations. Uncertainty analysis and safety verification

  • Standard guide for evaluating the predictive capability of fire models

  • NFPA 92 B

    Recommended practices for smoke management in atria malls

    (1991)
  • R.L. Iman et al.

    An investigation of uncertainty and sensitivity analysis techniques for computer models

    Risk Anal.

    (1988)
  • J. Helton

    Treatment of uncertainty in performance assessments for complex systems

    Risk Anal.

    (1994)
  • Peacock, R. D., Renke, P.A., Forney C.L. & Kostreva, M. M., Understanding sensitivity analysis for complex fire models....
  • Evaluating the Reliability of Predictions Mode using Environmental Transfer Models

There are more references available in the full text version of this article.

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