predicting strain demand histories imposed on box-shaped underground structures in seismic events

Conventional methods for seismic analysis of underground structures, namely, equivalent static analysis, close formed solutions, and investigation under statically imposed deformation cannot reflect the deference of seismic behaviors under various excitation frequencies. on the other hand, although the time history analysis provides more accurate results in the study of seismic response of soil-structure systems in the time domain, because of its significant required analysis time, its application is usually restricted to specific cases.