Ultimate Strength and Ductility of UHPFRC Reinforced Concrete Cross-Sections

De Maria, Simone and Briccola, Deborah (2023) Ultimate Strength and Ductility of UHPFRC Reinforced Concrete Cross-Sections. In: Proceedings of the 12th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2024. Copenhagen, Denmark, 24-28 June 2024) UNSPECIFIED. (Submitted)

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Ultra-High-Performance Fiber Reinforced Cementitious Composite (UHPFRC) and reinforced UHPFRC (R-UHPFRC) are mainly used to improve the performance of aging bridge structures against increasing traffic, aggressive environmental scenarios, and demanding operational conditions. Despite the growing number of applications, limited studies deal with numerical modeling of these structures. Therefore, the application of an already well-codified and rigorous method could support practicing engineers in the design of composite UHPFRC-RC structures, breaking down the last barrier to the widespread use of such an innovative material. The present paper concerns the analysis of (R-)UHPFRC and composite (R-)UHPFRC-RC sections of arbitrary shape under axial load and bending moments. After an isoparametric subdomains discretization, the solution of sectional equilibrium and compatibility equations, solved by numerical integration, allows to evaluate the frontier of interaction domains and moment-curvature diagrams.

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