Influence Of The Surrounding Ground Buildings Of Strong Motion Observation Stations Under Different Site Conditions On The Strong Motion Recordings

In the early twenty-first Century,with the vigorous promotion and support of the "fifteen" project,the construction of the strong vibration observation network in China has also been greatly developed,and the national digital strong vibration network covering the mainland has been formed.Through the existing strong vibration observation system,a large number of ground motion records have been obtained.In particular,about 1400 main earthquakes and more than 20000 aftershock records were obtained during the Wenchuan earthquake.This large scale station record enriched the world strong seismic record database,filled the blank of the record of strong earthquake near fault strong vibration,and caused the world.The world is concerned.But no matter from density or breadth,it is still far from enough.The construction of strong motion network needs to be further strengthened.The observation of strong motion records is not only the site environment and engineering structure around the station,but also the observation room and instrument pier of the station itself.The influence of the observation room and the instrument pier on the observation of ground motion recorded by the station has been paid attention to.The related research is carried out and the research results of its influence characteristics and laws are given.The research on the influence of the site environment and the engineering structure around the station on the observation of the ground motion records is relatively lack,and the regularity is not obtained.And quantitative understanding.In this paper,the influence of ground building surrounding the strong vibration station on different site conditions on the observation results is discussed.The main research work and the results obtained are as follows:1.Based on the ABAQUS finite element analysis software and the viscoelastic boundary method,the structure of 3,6,10 and 14 layers on the soil layer is taken as the calculation model,and the influence of the height variation of the building on the strong vibration observation results is compared and analyzed.On the point of view.2.Through the comparison of the simulated data,the influence of the distance between the observation point and the building on the results of the strong vibration observation is analyzed,and the difference of the observed results in different directions is compared.3.The effect of strong motion observation is not only related to the height of building and the distance between observation points and buildings,but also the key factor of site conditions.In this paper,the change of shear wave velocity in the half space site is analyzed and the influence of the buildings near the station on the observation is discussed.