Fuzzy probabilistic evaluation of soil-structure interaction effects on the soft-first-story structures

Even though the soil-structure interaction (SSI) has been investigated for long, less attention has been paid to the probabilistic framework. The present study used a fuzzy probabilistic approach to evaluate the effect of SSI on the nonlinear behavior of a soft-first-story structure with uncertain soil types. Sensitivity analysis was carried out to identify the relative importance of uncertainty parameters on the structural responses of the model structure. The analysis results showed that consideration of SSI in structures with relatively weak soil conditions could enhance the probability of irreparable damages in the structures. It was also observed that the variations in the weight density and shear wave velocity of soil were the most influential parameters in the structural responses.