Study On Fire Evacuation Time Of Underground Commercial Buildings

The background of the rapid growth in China's economic environment,the growing tension of land used for urban central area,the development of underground commercial building to become the important solution to solve the problem of urban land in recent years,the underground commercial types of building research under the background of the current era of considerable importance.While the underground commercial construction at the same time there are also special internal space environment,labor-intensive,high fire risk,rescue is difficult,and the imperfect existing related specification and shall not apply to the situation of modern society,the performance-based design method has the problem of insufficient basic research,under the condition of the underground commercial space to develop,to the personnel of underground commercial buildings under the circumstance of fire safety evacuation research has its necessity.Underground commercial building,the author of this paper under the condition of special construction environment,in emergencies such as fire in the building environment influence on evacuation movement time beforehand,and discuss the virtual scene based on VR technology experiment method,from the effects of the built environment factors on the pre action time,the influence of pre action time for the evacuation process,and the distribution of evacuation time three aspects are studied.Affect people through existing literature sums up the main influence factors in the process of the movement time,identified as three aspects: personal characteristics influence factors,environmental factor,factors affecting fire characteristics,and based on the construction of underground commercial building environment outside the characteristics of the information acquisition difficult,determine the characteristics of architectural space effect on the horizon.Through the chengdu-chongqing expressway in more than 20 field survey of the underground commercial building,and in the form of questionnaire survey analysis,data collection and analysis of the underground commercial construction personnel main influence factors in the process of the movement time,extract the main building horizon accessibility factors,type of alarm system as the main research,and using the research results as the basis to choose the evacuation VR experiment scene,the most unfavorable space design by controlling the construction sight accessibility and alarm type two kinds of main impact conditions,record the reality of virtual underground commercial building environment action time.Through data analysis software for underground commercial building fire simulation experiment personnel action time data analysis processing,construction were discussed by the horizon accessibility,alarm types and staff personal characteristics for the influence of the movement time,hydrophobic with the ground buildings and time distribution were analyzed to discuss the action time difference comes in,and on the basis of the analysis results,for thick calculate formula,design specification,software simulation under different conditions such as different precision and applicable environmental requirements,different types of underground commercial building types of pre action time value put forward the corresponding Suggestions.This article as a national natural science foundation of "based on the social force of underground commercial building fire evacuation design research" in the total project,underground commercial building fire evacuation model and visual simulation study,as part of the fire evacuation behavior research for underground commercial construction personnel to provide basic research support,and for establishing database of underground commercial building fire evacuation,underground commercial building fire evacuation environment effect and the individual factors affect the data support the basis of the experimental data.It provides guidance for the research on optimal design strategy of fire control evacuation of underground commercial buildings and the preparation of evacuation design guidelines.