The Fuzzy Fault Tree Analysis And Its Application To Construction Safety Management

Fault Tree Analysis ( FTA ) is a skilled events analysis technology in the safetysystem engineering , it is widely used in the system dependability ,but the traditionalFTA does not take the fuzzy issue of the probability of the events into account , whilein the real systems, to get the exact value of the probability of the events is a hardmission . It is maybe because that the conception of the events is vague, or the facorsthat affect the event is complicated and variable. While most researches of the fuzzyFTA use the triangle or trapezia fuzzy number to describe the probability of the basicevents , so their results seem to need to be further discussed.To solve the problems above , and to apply the fuzzy FTA to the industry of theconstruction engineering , this article uses normal distribution to describe theprobability of the basic events , and a series of formulas that can be popularly used tothe real systems are given , which describe the fuzzy probability of the topic eventsand the fuzzy probability importance degree of the basic events , thus , a nomaldistribution fuzzy FTA come into being . Finally , the mothod is explained by taking ahigh fall accident case for example .