Open AccessGround response analysis using non-recursive matrix implementation of hybrid frequency-time domain (HFTD) approach
Author(s) -
Amir Bazrafshan Moghaddam,
Mohammad Hossein Bagheripour
Publication year - 2011
Publication title -
scientia iranica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.299
H-Index - 51
eISSN - 2345-3605
pISSN - 1026-3098
DOI - 10.1016/j.scient.2011.11.019
Subject(s) - shake , nonlinear system , time domain , frequency domain , acceleration , response analysis , matrix (chemical analysis) , bedrock , transformation (genetics) , peak ground acceleration , field (mathematics) , process (computing) , mathematics , computer science , algorithm , geology , mathematical analysis , structural engineering , ground motion , engineering , physics , materials science , chemistry , composite material , operating system , biochemistry , classical mechanics , quantum mechanics , geomorphology , computer vision , mechanical engineering , pure mathematics , gene
This paper presents formulation of a Hybrid Frequency-Time Domain (HFTD) method for the solution of nonlinear ground response problem. Using non-recursive matrix approach, the displacements, caused by the bedrock acceleration, at the surface of layered soil are calculated while pseudo-forces due to nonlinear behavior of soil are obtained iteratively using an appropriate transformation scheme. The analysis process is continued until the pseudo-forces reach negligible values. Two different ground motions recorded at Gilroy 2 reference site during the Loma Prieta earthquake of 17 October 1989 and Coyote Lake earthquake of 6 August 1979 are analyzed using proposed method. The results are in good agreement compared to field observations. Furthermore, the two input motions are analyzed with SHAKE (Equivalent Linear Method) and NERA (Non-linear Method) programs and it is shown that the proposed method provides better predictions when compared with the field observations