An Analysis Of Fire Protection System Of Construction Safety In Large Commercial Construction

Large city commercial construction is characterized by large space, dense crowd and heavy fire loads which can give off amounts of poisonous smoke when burning. And crowds of people could be injured or killed simultaneously once fire happens in large commercial construction. Then large city commercial construction is taken as the research object.At first, fire cases from 1990 to 2003 of large and middle-scale city commercial construction are summarized. Fire son-fault trees are built up according to the fire development rule and the principle of fault tree analysis. Those are: the fault tree of reasons on fire, the fault tree of failure in extinguishment at the initial stage of fire, the fault tree of failure in controlling over fire extension, the fault tree of failure in fire extinguishments and the fault tree of failure in evacuation. On calculating the probability of basic events, the probability of top events and the importance of basic events are then induced. And the analysis of error propagation of fault tree is made. The key factors that make the son-systems fault will be found out according to the order of the importance of basic events.Secondly, the principle block diagram of fire protection system is set up. On the basis of the fact of fire development rule of city commercial construction, reliability block diagram of fire protection system and its son-systems are made up following the principles just as is:â‘  Preventing fire;â‘¡ Extinguishing fire at the initial stage of fire;â‘¢ Ensuring the safe of evacuation and reducing lose of properties.Through calculating the importance of every basic event of fire protection system andarranging them in order, the primary and secondary elements that influence the reliability of fire protection system are determined.Thirdly, Bayes statistical analysis method is used in the analysis of fire cases of large and middle-scale city commercial construction because it is built up on the basis of prior distribution and sample survey. According to Bayes statistical analysis model, the posterior distribution of every basic event is given. Then the fire protection system of city commercial construction will be appraised using Bayes system evaluation method. And the reliability distribution function of fire protection system is induced.At last, the strategic decision of the fire protection system is made. According to the order of the importance of basic events, the strategic decisions of system and its son-systems are given. The measures how to increase the reliability of fire protection system are made to arrive at the target of preventing fire, reducing lose of property and life from fires.