ABSTRACT
Liquefaction potential is commonly evaluated by utilizing deterministic methods and by discounting the influence of soil-structure interaction (SSI). Though these simplify liquefaction assessment, lapses may occur in situations where they emerge as significant. In this paper, Constrained Differential Evolution (CDE) algorithm was applied in reliability-based evaluation of SSI-induced liquefaction potential. The developed CDE algorithm was validated using the dataset of a First Order Second Moment-based study on liquefaction potential. Validation results showed that the difference between results of CDE algorithm and FOSM-based approach was not statistically significant. The reliability-based CDE method was utilized in a case study in Baseco, Manila. Results showed that foundation increases the surrounding vertical stresses, thereby decreasing liquefaction probability. However, in deeper layers, SSI analysis was found to be more conservative than free-field analysis. Results also indicate that soil layers deemed supposedly safe by deterministic methods, i.e., FS>1, may still have considerable probabilities of liquefaction.
