Abstract
Traditional methods for designing of civil engineering structures and other engineering systems are frequently based on the concept of target probability of failure. However, this fundamental quantity is usually specified on the basis of comparative studies and past experience only. Moreover, probabilistic design methods suffer from several deficiencies, including lack of consideration for accidental and other hazard situations and their consequences. Both of these extreme conditions are more and more frequently becoming causes of serious failures and other adverse events. Available experience clearly indicates that probabilistic design procedures may be efficiently supplemented by a risk analysis and assessment, which can take into account various consequences of unfavourable events. It is therefore anticipated that in addition to traditional probabilistic concepts the methods of advanced engineering design will also commonly include criteria for acceptable risks.
Highlights
Present standards for design of civil structures [], 2, 3] are mostly based on the concept ofthe target probability of failure 10
Howeve4 it is well recognised that the reliability of srmctures and other engineering systems suffers from a number of uncertainties, thar can hardly be analysed 14, b,6l and well described [7] by probabilistic methods
With regard to probabilistic concepts, it should be noted that civil engineering structures and other engineering systems suffer fiom a number of uncertainties, which can hardly be entirely described by available theoretical tools
Summary
Probabiliry of failure F Target probability of failure Probability P(FlI12) ofstructural failure during fire Probability of fire start P(I12) Generic point of the vector of basic variables Vector ofbasic variables. Reliability index Probability density function of the vector of basic variables X
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