Multi-fire scenario reliability assessment of water supply for fire protection in historic cities
Given the current situation of frequent fire accidents in Yunnan Province,assessing the fire safety of ancient towns is a task of great practical significance for the safety of people's lives and property and the protection of cultural heritage.The fire failure indices is proposed to screen buildings and combinations with high fire failure risk.Firstly,the fire flow calculation method of the US Federal Insurance Office was used to assess the fire water demand of important individual buildings in the event of a fire.Secondly,a hydraulic model was then constructed to assess the water supply capacity of the fire network.Finally,the building fire failure indices is calculated to identify hazardous buildings and hazardous combinations.The proposed algorithm is applied to the fire pipe network of Dayan Old Town in Lijiang City,Yunnan Province.The results show that the failure index of a single fire scenario is not only related to the pipe diameter of the pipe,the number of fire hydrants near the building and the fire resistance class of the building,but also depends on the location of the building.With the increase of the number of fire scenarios,the failure index of each building shows a different degree of increase,and the maximum can be more than 30%.It is recommended to install additional fire hydrants near the fire pipe network in the area with fewer fire hydrants in order to increase the fire water supply capacity and optimise the fire fighting facilities in buildings far from water sources.
NETL
NSTL
万方数据
