Bending analysis of RC–UHPC panels in semi-precast slab using finite element method
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This paper presents a finite element (FE) analysis of the flexural behavior of a semi-precast RC-UHPC panel during the construction stage. The panel consists of a prefabricated assembly comprising a bottom ultra-high-performance concrete (UHPC) layer, an expanded polystyrene (EPS) lightweight concrete core, and a steel truss mesh. The FE model employs flat triangular shell elements for the concrete layers and 3D bar elements for the steel truss, implemented using the CALFEM-Python framework. The model is validated against experimental data from the literature. A parametric study investigates the effects of the UHPC and EPS thicknesses as well as steel reinforcement diameters on panel deflection under self-weight and construction load. Results show that the EPS thickness is the dominant parameter governing flexural stiffness, while reinforcement diameter has a comparatively minor influence. Specific configurations satisfying practical deflection limits are identified, providing design guidance for this emerging slab typology in the construction phase.
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