以徐州为例初探城市社会因素地震易损性分析
PRELIMINARY ATTEMPT OF APPLICATION OF SEISMIC VULNERABILITY ANALYSIS TO URBAN SOCIAL FACTORS, WITH XUZHOU AS EXAMPLE
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摘要: 徐州是我国震害预测试点城市之一。影响城市震害的主要因素是城市所处的地质背景——地质因素和城市现状——社会因素。本文以现场调查资料为基础,以宏观震害经验为依据,考虑建筑物结构类型、建筑质量、建筑密度、人口、空旷场地、道路和危险工业等社会因素,运用多因素易损性(vulnerabiliy)分析法,完成了徐州市社会因素地震易损性分析,指出了该市抗震的薄弱环节和薄弱地区,为抗震防灾提供了依据。 地震易损性分析的结果是地震易损性分析图,总的易损性指数M是编制易损性分析图的依据。在总的易损性指数M中,建筑物易损性指数b占60—70%,其为建筑物易损性趋势矩阵A乘以建筑物组成矩阵B的转置阵矩阵BT所得矩阵C的迹。Abstract: Xuzhou is one of the cities chosen for urban earthquake hazards prediction in China. The main factors causing urban earthquake hazards are the urban geologic background and the present urban situation. In this paper we take spot coverage data and macroscopic earthquake hazards as bases, and take the social factors, such as structure type, building quality, building density, population, open space and road conditions, into accound. With the help of the method of vulnerability analysis for multiple factors we have completed the vulnerability analysis of the urban social factors for Xuzhou. From the results obtained in the present study we indicate the weak points and places in the urban earthquake preparedness work, try to provide a basis for improving earthquake preparedness so as to mitigate natural calamities.The result of the seismic vulnerability analysis is presented as a map of seismic vulnerability analysis. The total index M is the base for compiling a map of vulnerability analysis. Of the total vulnerability index M, the building (structure type, building quality) vulnerability index b makes up 60—70 per cent, it is the trace of matrix C which the building vulnerability tendency matrix A times the building composition matrix BT.
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