Visualization Of Building Collapse And Evacuation Under Earthquake Warning

Earthquake is a serious natural disaster,which will lead to the collapse of buildings and casualties.The collapse time of buildings will directly affect the available evacuation time,and the collapse mode of buildings will also affect the evacuation strategy and casualties.Therefore,it is necessary to study the collapse behavior of single building in detail.In view of the characteristics of the sudden earthquake,the research on earthquake early warning technology and the construction of early warning network have been carried out at home and abroad,which provides valuable escape time for earthquake prone areas.However,the current earthquake evacuation simulation rarely considers the impact of earthquake warning,so the study of evacuation considering earthquake warning has innovative significance.For the seismic performance evaluation of structures,the requirement of "three levels" is adopted at present,and the goal of "fourth level" under extremely rare earthquake is a hot topic in civil engineering.In order to solve the above problems,the second chapter divides the building structure into finite entity elements based on the basic principle of explicit dynamics finite element method.The modeling is completed on the ANSYS platform,the failure threshold is defined,and the DYNA-Solver is used to solve and calculate,and the results are verified and analyzed in the Pre-Post software,so as to realize the animation output of the building in the whole collapse process Stress change.In the third chapter,the evacuation behavior is simulated by setting different warning time.Considering panic and running,the movement model is adjusted,and the relationship between the necessary time and the number of people stranded with the warning time is obtained.The influence of the warning time on the evacuation is analyzed comprehensively.In the fourth chapter,the seismic performance of the building is analyzed,and the results of seismic "three levels" are obtained,and the vulnerability curve is drawn.Finally,combined with the collapse and evacuation results,the casualty assessment of the building is given,and the seismic target requirements of "the fourth level" are discussed.In the collapse simulation analysis of this paper,the visual process of building earthquake collapse is realized,and the collapse time of the structure is 7.68 seconds,the weak layer appears in the second floor,the roof and doors and windows are seriously damaged,and the upper part of the structure maintains a certain integrity,which provides the analysis results for the collapse resistance design and personnel evacuation of the structure.Evacuation under earthquake early warning,considering the impact of early warning time on evacuation activities,this paper analyzes the relationship between early warning time and the number of people stranded and the necessary evacuation time,realizes the simulation of evacuation under earthquake early warning,and finds that earthquake early warning has a positive impact on reducing evacuation time and the number of people stranded.Earthquake warning is not considered in the previous study of earthquake evacuation.The seismic vulnerability analysis based on IDA method fully reflects the seismic level of the structure,and the structure meets the seismic requirements of "three levels".Finally,combined with the results of collapse and evacuation,the casualty prediction is given.