Study on the Contrast between Two Seismic Response Analysis Programs of Soil Layer

56 ground motions of the bedrock and surface are selected from 28 stiff sites ( site class I and site classⅡ) of the KiK-net station．The peak acceleration, response spectra and shear strain of actual hard sites are calculated by using SHAKE2000 and LSSRLI-1. The similarities and differences between SHAKE2000 and LSSRLI-1 and their differences from measured records are analyzed. It provides a basis for improving the seismic response analysis method of soil layers. The results show that when the soil is not obviously nonlinear, most of the difference in PGA results calculated by SHAKE2000 and LSSRLI-1 can be ignored, and the maximum error of the calculated soil shear strain is also less than 20%. When the soil is highly nonlinear, only a few differences in PGA results can be ignored. The maximum error of shear strain of the soil is greater than 20%. The results of peak acceleration and response spectra calculated by SHAKE2000 and LSSRLI-1 differ greatly from the measured results in most cases. Nevertheless, the probability of having big difference and significant difference between LSSRLI-1 and measured response spectra is greater than SHAKE2000.