Mechanical properties of a semi-precast slab with a layered implementation

Building constructions, buildings and structures
Authors:
Mawlood, Dara AnwerKoyankin, Alexander Alexandrovich
Abstract:

The object of research is a precast reinforced concrete slab, for which an advanced layered finite element method is implemented to model and determine the stress-strain relationships of the constituent materials within the computational framework for semi-precast slabs. This work evaluates the flexural performance of semi-precast slabs through a numerical investigation based on a generalized computational algorithm implemented in MATLAB. The proposed method introduces a layered finite element method for analyzing precast reinforced concrete (RC) slabs, built on a refined global-local plate theory. The cross-section of a semi-precast RC slab is divided into several concrete and steel layers, with each layer treated as an independent plate structure that retains its own material properties. Results. From the input data, the code calculates both global and local stresses and strains. The MATLAB flowchart is provided. A major advantage is that it requires no shear correction coefficients. In addition, although the model is layer-based, the number of unknowns for the displacement and stress fields remains constant, regardless of the total number of layers. Benchmark comparisons and numerical tests show that the proposed method yields highly accurate results while remaining computationally feasible.

Key words:
Kinematic layerStrain and stress fieldsLayered formulationFinite element discretizationSemi-precast slab
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