Comparison On One Dimension Numerical Methods Of Site Seismic Response Analysis

Site seismic response analysis is one of the important issues in engineering seismic research.At present,the analysis method actually used in engineering is still mainly one-dimensional nonlinear analysis method of site seismic response,but there are many different algorithms for this type of method;the applicability of the different methods and the reliability of the results are worthy of focus in this type of research.Based on this consideration,this paper takes the actual strong vibration observation array field as a sample and uses the actual recorded amplitude modulation as input to carry out a comparative analysis of four different analysis methods.The thesis mainly includes the following research work.1.The research status of site seismic response analysis method,especially the one-dimensional nonlinear analysis method of site seismic response is summarized and a brief review is made;four kinds of one-dimensional nonlinear analysis method of site seismic response are briefly introduced.2.In this paper,the actual data of No.3 logging in Xiangtang Array site effect array is selected,and the actual recorded amplitude is used as input.Four methods are used to analyze the surface seismic response under different earthquake action levels,and a variety of time domain and frequency domain parameters are used.A comparative analysis of the nonlinear seismic response of the site was carried out andcompared with the corresponding statistical values actually recorded.The results show that there are still some differences between the surface response obtained by different methods and the site amplification effect.3.Using the normalized spectral ratio method,the nonlinear effects of different algorithms are discussed.The results show that the nonlinear effects of different methods are different from the frequency domain.The differences in nonlinear effects of different analysis methods are mainly reflected below 1 Hz and above 10 Hz.In the frequency range of the frequency band,this difference is the reason for the difference between the surface calculation results and the site amplification effect.Based on the results of this paper,when the input seismic action is small,the calculation results of different analysis methods are relatively close;when the input seismic action is large,the strain of the soil has entered the nonlinear stage,it is recommended to use the time-domain nonlinear method to carry out the seismic response of the soil layer analysis.