Simplified Model for Composite Hollowcore Slabs
Composite Hollowcore Slab analysis uses any 2D structural analysis software. In this approach, the hollowcore slab and the topping concrete are modelled as frame elements connected by rigid arms. These rigid arms are essential to capture the interaction between the slab and the concrete topping. Horizontal (shear) springs and vertical (peel) springs between these rigid arms account for the shear and peel stiffness of the interface between the two materials.
The shear stiffness typically ranges between 2-8 (N/mm)/mm², while peel stiffness is 1.5 (N/mm)/mm². These values were derived from experimental data based on hollowcore slabs produced by two manufacturers. However, adjusting these stiffness values based on specific project conditions and material properties is crucial. Accurate adjustments ensure the most realistic analysis for your structure.
Serviceability vs. Ultimate Limit State
This approach is particularly suitable for serviceability checks, which assess stresses, cracking, and deflections under typical load conditions. However, a more advanced modelling approach is required for more critical evaluations, such as ultimate limit state (ULS). ULS analysis demands non-linear modelling that can account for construction stages, material nonlinearity, prestressing, and shear and peel springs to provide a more accurate representation of the structure’s failure conditions.
Application in Structural Engineering
The tools we provide for composite hollowcore slab analysis help structural engineers optimize designs for serviceability and ultimate load conditions. They are applicable across various sectors, including residential, commercial, and industrial projects. These tools allow engineers to predict long-term performance and ensure that structures comply with modern standards.
For more information on the methodology and its applications, refer to the following.
Adawi A, Youssef MA, Meshaly ME, 2016, “Finite Element Modeling of the Composite Action between Hollowcore Slabs and the Topping Concrete“, Engineering Structures, 124: 302-315.
DISCLAIMER
Simplex Engineering Inc. is not liable for any actual designs based on information from this site. Design engineers are responsible for complying with professional engineering regulations and adhering to applicable design standards, codes, and practices. We welcome the opportunity to collaborate on structural engineering projects. Don’t hesitate to contact us for more information about our services and fees.