Study On The Applicability Of Engineering Input To Strong Ground Motion Records Considering Regional Differences

With the development of strong-motion observation technology in recent years,more and more high-quality strong-motion records have been obtained worldwide,providing convenience for wave selection in China’s time-lapse analysis.However,considering that the source,path and site characteristics of earthquakes are not the same in different regions,there are regional differences in ground shaking characteristics,which brings uncertainty to the selection of ground shaking input and can directly affect the reliability of seismic protection in engineering.In order to make the process of wave selection more controllable,this paper selects the last ten years of shallow intracrustal earthquakes from five public databases around the world and combines them with the PEER NGA West 2 database strong-motion data to form a dataset.Efforts were made to take into account the application of this dataset,as follows:(1)A shallow intracrustal seismic dataset suitable for application in time-lapse analysis in China was constructed and composed into a Flatfile.a screening process for shallow intracrustal events with reference properties was collated according to the Slab2 model and the classification method of Zhao et al.(2015);a site category classification scheme with reference values was provided for all stations;site conditions,distances,magnitudes,response spectral values The information on site conditions,distances,magnitudes and response spectral values were compiled in Flatfile to establish an alternative data set for ground shaking input selection,which fills the shortage of natural strong shaking data for ground shaking input selection in China.(2)Regional differences in global ground shaking characteristics were analysed.The final dataset was divided into six regions:Taiwan,China,Mexico,Central Asia in the Middle East of Europe,Japan,the United States and New Zealand,and compared with the BSSA14 ground shaking attenuation model,the design spectrum of China’s resistance regulations and the holding time prediction model of Xu Peibin et al.(2018)based on three perspectives of amplitude,spectrum and holding time to explore the regional differences in ground shaking characteristics between these regions and China;based on the observed and predicted values of residual analysis,respectively,to summarize the regional differences in earthquake sources,paths,and sites in these regions.(3)The applicability of global ground shaking input to China’s engineering is analysed.Using strong shaking records from the last 10 years of Mw≥6.0 shallow intracrustal earthquakes in five earthquake-prone countries and regions as the study dataset.The normalized normative design spectra are used as the target spectra to compare and analyze the applicability of the records from different countries and regions as ground shaking input for structural time analysis in China from the perspective of matching the spectral shapes of full-period and sub-period segments,respectively.(4)A ground motion record selection system was designed and developed based on the collated Flatfile.In this study,a strong ground motion record selection system is designed and developed in Python,which can meet the requirements of the anti-regulation regulations,and contains rich strong motion information.The framework and usage of the system are described in detail.