Сombined asymptotic method in calculation of the internal structural forces: linear spectral analysis

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Rubric:     Theoretical and experimental studies   
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The new options of SCAD soft enabling linear spectral analysis following the requirements of nuclear industry codes were tested against close form solutions, ABAQUS modal analysis and FFT analysis in the frequency domain. Single-mode responses to 1D excitation were checked including angular  excitations; then multi-mode responses to 1D excitation were compared including residual modes. Finally the responses to the six-component excitation set up at the rigid base mat were compared. This excitation was obtained using Combined Asymptotic Method to account for soil-structure interaction. The results demonstrate the unacceptable underestimation of vertical internal forces calculated using civil codes (unlike nuclear codes)