基于压力-状态-响应模型框架的城市地震综合易损性评价

Comprehensive evaluation of urban earthquake vulnerability under the framework of PSR

为了科学评价城市地震灾害状况,降低城市易损性,基于压力-状态-响应模型框架,构建城市地震综合易损性评价指标体系,其中压力类、状态类、响应类指标分别为7、13、8项。应用熵权法确定了各评价指标的权重,提出基于云模型的城市综合易损性评价模型,并运用雷达图分析法实现城市内各个区综合易损性的相对高低。应用上述方法,对兰州市中心城区进行了震害综合易损性评价,结果表明:兰州市综合易损性等级偏向Ⅲ级,易损性中等,其中红古、安宁区的易损性程度较高,城关、七里河易损性程度较低;经济因素对各区域的易损性影响较大,通过对易损区域加强管理建设,提高城市的防震减灾能力。

Assessment indicator system of comprehensive earthquake vulnerability in cities is established,which is aimed to reduce the vulnerability in cities,for the purpose to conduct scientific evaluation on earthquake vulnerability.The system is based on pressure-state-response(PSR)model framework,respectively the indicator is 7,13 and 8 items.The assessment model of comprehensive earthquake vulnerability in cities,based on cloud model,is brought up by determine the weights of each indicator through the method of entropy weight.At the same time,radar maps are applied to analyse the relativity of comprehensive vulnerability in different districts in cities.An evaluation on comprehensive vulnerability after earthquake damage in center districts in Lanzhou was conducted by application of above mentioned methods.The result shows that comprehensive vulnerability in Lanzhou deviates to levelⅢwith a medium vulnerability.Honggu and Anning Districts suffer from higher vulnerability while Chengguan and Qilihe Districts bear the lower.In addition,economic elements have a rather prominent impact on the vulnerability in the various districts.Reinforcing management and construction in more vulnerable districts can improve their capacity in the act of earthquake prevention and disaster reduction.