Research on seismic motion in the frequency domain in three-dimensional site based on harmonic response
LIU Shuang
YAN Shaomin
PEI Wang
Abstract：To improve the computational efficiency of frequency-domain calculations for seismic response in three-dimensional(3D)sites,an equivalent nodal force formula is derived based on the engineering wave motion theory for vertical incidents of P-waves,SV-waves,and SH-waves.By utilizing frequency-domain analysis theory and fast Fourier transform algorithms,the time-domain equivalent nodal force formula is transformed into a frequency-domain calculation formula,to enhance the efficiency of 3D frequency-domain calculations.Additionally,a core calculation program for frequency-domain analysis of local site effects is developed using the ANSYS harmonic response analysis module.The frequency-domain calculation results for free-field sites,sedimentary basins,and subsided sites are separately validated.The research findings demonstrate that utilizing harmonic response analysis significantly improves the computational efficiency of seismic response frequency-domain results,while maintaining a high level of accuracy.
Keywords：seismic motion in the frequency domainfrequency domain analysislocal site effectharmonic response analysis
Publication Date：2023-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：11( 142-152 )