Construction Of Seismic Damage Scenarios For Urban Buildings Based On Ground Motion Parameters

The construction of earthquake disaster scenarios based on rapid assessment of seismic intensity and building damage simulation is one of the important technologies to carry out earthquake emergency command and decision after a destructive earthquake and reduce casualties and economic losses.At present,the results of rapid seismic intensity assessment differ greatly from the actual situation,and the higher the magnitude,the lower the accuracy.The construction of an integrated and automated emergency workflow.Therefore,it is of great scientific significance to study new methods for rapid assessment of earthquake intensities and building damage simulation techniques based on different intensities for the effective implementation of earthquake emergency work.To address the above limitations in seismic emergency response,this study combines the ground shaking attenuation model with the empirical relational equation for ground rupture and the inverse projection source inversion method,respectively,to obtain ground shaking parameters and seismic intensity quickly and accurately in regions lacking strong ground shaking stations.Based on the theoretically calculated ground shaking parameters,we simulate the damage of buildings under different ground shaking effects.Finally,we develop the earthquake disaster scenario construction software for the whole process of earthquake emergency response to quickly simulate the disaster scenarios after the earthquake and realize the functions of automatic software start-up,earthquake intensity assessment and simulated building damage results.The basic contents and main conclusions of this study are as follows:(1)The empirical method of surface rupture combined with the ground shaking parameter attenuation model,the inverse projection source inversion method combined with the ground shaking attenuation model,and the widely used elliptical attenuation model were used to evaluate the seismic intensity of four typical earthquake cases in recent years in mainland China.By comparing and analyzing the three assessment results with the actual survey intensity,strong vibration observation and other measured data,the following conclusions were obtained: the elliptical attenuation model has certain accuracy in assessing the seismic intensity of small and medium-sized earthquakes and earthquakes with relatively simple seismogenic structures,and the seismic intensity assessment method based on the ground vibration attenuation model is more suitable for rapid assessment of seismic intensity of large earthquakes(M?7.0),and the site corrected The combination of empirical surface rupture length and ground vibration attenuation model is suitable for simple earthquakes with bilateral ruptures.The inverse projection seismic source inversion combined with the groundvibration attenuation model can reflect the real surface rupture process,and the seismic intensity assessment results can be more consistent with the actual intensity.(2)Based on a variety of data sources such as Lanzhou City Gaofen-? images,field survey data and panoramic maps,high-precision building data including building area,number of floors,building structure and other attribute information were obtained for the urban area of Lanzhou City;by setting up simulated earthquakes,the damage of buildings in the urban area of Lanzhou City under different ground shaking effects was simulated and the results of earthquake damage were displayed in three dimensions.According to the simulation results,it is found that the buildings in the urban area of Lanzhou City can basically meet the building requirements of 8 degrees of protection,the building structures with good seismic performance are frame structures,and the building types with weak seismic protection are brick and concrete structures of 3-6stories and unprotected brick and concrete structures distributed in urban villages.(3)Based on the results of the first two studies,a component-based and WEB-side earthquake scenario simulation software was designed and developed to realize the workflow of triggering an earthquake-rapid assessment of earthquake intensity-building damage scenario construction.The software can automate the output of earthquake emergency information such as rapid assessment of earthquake intensity and building damage,and produce the results of earthquake intensity assessment and building damage list within 30 minutes after the earthquake,which improves the efficiency of building damage scenario construction after the earthquake.It is of great relevance to the seismic hazard investigation and the promotion of earthquake science knowledge.