RFD Optimization: Mechanical Properties and Durability Analysis and Performance Evaluation of UHPC Bridge Structures

To investigate the mechanical properties and durability of UHPC bridge structures under varying environments, this study designed factorial experiments covering three curing temperatures, two sand types and mineral admixtures, then coupled accelerated durability tests (chloride penetration, sulfate attack, freeze–thaw) with on-site monitoring data. A DOA-RF model was developed by optimizing Random Forest parameters through the Dream Optimization Algorithm and validated against experimental results. Compressive strength reached 150–200 MPa, tensile strength 10–20 MPa; high-temperature curing increased flexural strength by ≈8 % yet reduced chloride permeability by 23 %, demonstrating superior marine durability. The DOA-RF algorithm achieved the lowest MSE and highest R² (0.75) among all benchmarked methods. Beyond engineering performance, the study proposes the first framework integrating UHPC with cultural-creative industries for accelerated marketization, branding and internationalization, offering a novel pathway for sustainable infrastructure innovation.