THE BEHAVIOR OF REINFORCED CONCRETE SLABS ON BASES SUBJECTED TO SHRINKAGE AND CONSTRUCTED WITH COMPLEX HOLE GEOMETRIES
DOI:
https://doi.org/10.36773/1818-1112-2025-138-3-41-44Keywords:
concrete large slabs, complex holes, geometric parameters, shrinkage stress, interactionAbstract
This paper presents a comprehensive study on shrinkage cracking in large-scale concrete slabs with complex openings, a critical concern for industrial and civil structures like nuclear plant foundations and industrial floors. The research systematically quantifies the influence of key geometric parameters – hole shape (circular, elliptical, hexagonal) and spatial distribution (centrally symmetric, eccentric, random multi-hole patterns) – on the shrinkage interaction between the slab and its foundation. An integrated methodology combining full-scale experimental testing on 4 × 4 × 0,25 m slabs, theoretical modeling using an enhanced Pasternak – Vlasov foundation model, and detailed finite element analysis (FEA) in Abaqus was employed. Results demonstrate that elliptical holes induce the most severe stress concentration, increasing shrinkage stress by approximately 33 % compared to circular holes, while random multi-hole configurations raise corner stresses by 42 % due to global stiffness reduction. Eccentricity was found to linearly shift the zero-shear stress location (Δx = 0,75 e). A novel predictive model for the stress concentration factor (Kt), incorporating shape aspect ratio (λ), relative eccentricity (e/l), and number of holes (n), was developed with high accuracy (R² = 0,92). The study provides essential parameters and robust theoretical support, leading to practical design recommendations for reinforcement detailing and hole geometry optimization to enhance crack resistance in perforated slabs, thereby enabling more reliable and economical engineering solutions.
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