OasisLMS

Abstract: This study focuses on the multiobjective optimization of drilled shafts for the Circunvalació n Norte viaduct project in Costa Rica, utilizing the Pareto-Front method. The viaduct is supported by 58 piles, consisting of 420 drilled shafts, and an efficient design must balance the minimization of shaft length or quantity with maximizing their resistance to ensure structural safety. Both Deterministic Design Optimization (DDO) and Reliability-Based Design Optimization (RBDO) are applied, with the resistance of each drilled shaft modeled using random variables (RVs) to account for the inherent variability in soil conditions and material properties. The Pareto-Front method addresses these conflicting objectives by identifying optimal solutions that offer a trade-off between the two criteria. The optimization process involves calculating the total drilled shaft length for each pile and its corresponding resistance, then applying the Pareto-Front technique to determine the best compromise. These configurations are considered Pareto-optimal, as no improvement can be made in one objective without worsening the other. A surrogate model is used to conduct both deterministic and probabilistic analyses, providing valuable insights into the optimal allocation of drilled shaft resources while ensuring structural safety and controlling construction costs. This approach not only enhances the design efficiency of the Circunvalació n Norte viaduct but also demonstrates the effectiveness of the Pareto-Front method in large-scale civil engineering projects. By integrating multiobjective optimization, the project effectively balances economic and safety goals, establishing a benchmark for future infrastructure developments.

Ing. BERNARDO JIMENEZ; Engr. Dr. Adrian Torrico Siacara

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