Applicability of Total Stress Seismic Ground Response Analysis Under Large Earthquakes

Abstract eng:
Equivalent linear and truly nonlinear analyses, and total stress and effective stress analyses are compared at 268 sites under 11 earthquake motions in order to grasp general feature of the applicability of the equivalent linear method and total stress analysis. SHAKE and YUSAYUSA are used for equivalent linear and truly nonlinear methods, respectively. SHAKE shows larger peak acceleration and smaller peak displacement than YUSAYUSA (total stress analysis), but other indices such as instrumental seismic intensity, peak velocity, and spectral intensity are nearly same to each other. Therefore, it is applicable when truly nonlinear analysis is applicable. All earthquake motion indices are overestimated by the total stress analysis at the liquefiable sites. Therefore, it is recommended to use effective stress analysis at these sites. However, as indices are overestimated, use of the total stress can be said to result in conservative design. It is also noted that displacement or shear strain is underestimated in the total stress analysis.

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