Abstract:The spatial distribution of ground motion parameters of two earthquakes was simulated by using the intensity attenuation model based on the shortest fault method, and the reliability of the model was verified through a comparison with the meizoseismal area of actual earthquakes. Then, based on the simulated spatial distribution of seismic intensity and the information of building structure type and story height in Chengguan District of Lanzhou City, a three\|dimensional seismic damage simulation of buildings was carried out with the elastoplastic time\|history method. The results showed that the proposed model could well simulated the spatial distribution of historical earthquake intensity. When the seismic intensity reaches Ⅷ degree, the overall seismic performance of buildings in Chengguan District of Lanzhou City is good; When the seismic intensity reaches Ⅸ degree, the buildings with 3-7 stories is seriously damaged by the earthquake. The seismic performance of buildings in the mountainous areas of southern Chengguan District and the urban villages is weak. The results of this paper can not only provide an important technical support for the survey of earthquake disaster risk and key hidden dangers, but also help government to investigate, repair, and reinforce hidden danger of urban buildings. It can also help to improve the accuracy of earthquake disaster risk assessment, which is of great significance for earthquake disaster emergency rescue in large and medium-sized cities.
