Simulation research on natural gas leakage explosion accident in masonry residential building based on FLACS
Aiming at the structural characteristics of masonry resi-dential buildings,taking the gas flash explosion accident in resi-dential buildings in Wafangdian city as the research object,FLACS software was used to model explosive floor in 3D.Gas leakage and explosion were simulated considering injection direc-tion,doors,windows,partitions and other factors.Results showed that,horizontal and vertical leakage have almost no im-pact on the volume fraction distribution of natural gas,with kitchen volume fraction higher due to hall partition obstructing ef-fect;Room 504 explosion pressure increased sharply at the begin-ning of explosion,transmitted outward through doors and win-dows in arc form.Explosion pressure at 400 s was lower than 600 s,with pressure at 600 s explosion greater than brick wall failure pressure of 76 kPa causing structure damage.Research results provide theoretical guidance for accident inversion,stability evalu-ation of damaged structures and accident prevention.
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