Structural Behavior of Precast Hollow Core Slabs

Precast hollow core slabs represent a widely adopted floor and roof system in modern construction, combining high production efficiency with improved structural performance. Manufactured under controlled factory conditions, these units incorporate longitudinal voids that reduce self-weight while retaining flexural stiffness and load-bearing capacity. Prestressing strands or wires introduced prior to concreting impart beneficial compressive forces, enhancing crack control and deflection performance under service loads. Key aspects of their structural behaviour include flexural response governed by interaction between the prestressed tensile reinforcement and concrete section, shear transfer through thin webs adjacent to voids, and long-term effects such as creep and shrinkage. Connections between adjacent slabs—achieved via grout, bolted plates or shear keys—shape overall diaphragm action and influence redistribution of bending moments. Numerical analyses, often based on nonlinear finite element models, have refined our understanding of stress concentrations around voids and joint interfaces, leading to more accurate design predictions. Practical applications span residential, commercial and industrial buildings, where rapid erection, reduced formwork and lower embodied carbon contribute to sustainable construction. Advances in quality control, joint detailing and code provisions continue to broaden the performance envelope of hollow core technology.

Research from Nature Portfolio

Recent studies have explored innovative joint configurations in hollow core composite slabs to enhance bidirectional load-bearing performance. An experimental investigation on slabs with tightly connected panel sides demonstrated that eliminating protruding reinforcement at panel interfaces does not compromise flexural development under normal loads. Under ultimate conditions, failure modes shifted from ductile bending to brittle interface tearing, with a noted 17.1 % reduction in bending capacity as joint frequency increased. However, strategic joint placement away from peak moment regions yielded a 13.5 % gain in stiffness. Analytical comparisons confirmed that supplementary reinforcement at joints effectively facilitates lateral load transfer, validating novel joint-connected hollow slab designs for robust bidirectional action.

Structural Behavior of Precast Hollow Core Slabs publication trend

The graph below shows the total number of articles in structural behavior of precast hollow core slabs across all publications each year (not limited to Nature Index journals).

Technical terms

Hollow core slab: A precast concrete unit featuring continuous longitudinal voids to reduce self-weight while maintaining structural depth and stiffness.

Prestressing: A method of introducing initial compressive stress into concrete via tensioned steel tendons to counteract service loads and control crack formation.

Flexural stiffness: The resistance of a slab section to bending, determined by section geometry, material properties and reinforcement layout.

Web-shear capacity: The ability of the thin concrete webs between voids to resist diagonal shear forces without transverse reinforcement.

Nonlinear finite element model: A numerical simulation that accounts for material nonlinearity, cracking and large deformations to predict structural response accurately.

References

1. Experimental study on the flexural performance of concrete hollow composite slabs with tightly connected panel sides. Scientific Reports (2024).
2. Web-Shear Capacity of Thick Precast Prestressed Hollow-Core Slab Units Produced by Extrusion Method. International Journal of Concrete Structures and Materials (2019).
3. Experimental and Numerical Assessment of Flexural and Shear Behavior of Precast Prestressed Deep Hollow-Core Slabs. International Journal of Concrete Structures and Materials (2020).
4. Shear Performance for Prestressed Concrete Hollow Core Slabs. Applied Sciences (2020).