Keywords: material, deformation, model, strength, stress-strain, slip-resistance, cold-punched, transformed, diagrams.

Design calculations for floor slabs with profiled steel sheeting as external reinforcement are based on the classical theory of reinforced concrete elements in which the stress-strain state of sections is analyzed only at ultimate states [1]. This method does not take into account the concrete/profiled steel sheetings slip bond failure mode and the weakening effects of the cold-punched anchoring embossments on the mechanical properties of the reinforcing sheets, which are accommodated by the use of empirical coefficients [2].

Currently, the most appropriate way of optimizing reinforced concrete design methods is by incorporating stress-strain material diagrams. This allows a more efficient utilization of structural materials, provides means of assessing the stress-strain state of any section at all loading stages, a crucial aspect especially in building pathology [3].

This paper outlines research work carried out with the aim of obtaining data which will make it possible to take into account the concrete/profiled steel sheetings slip bond failure mode and the weakening effects of the cold-punched anchoring embossments on the mechanical properties of the reinforcing sheets in the form of transformed profiled steel sheeting deformation diagrams.

The experimental research work was carried out with the main aim of presenting the concrete/profiled steel sheetings slip bond failure mode and the cross-section weakening effects of the cold-punched anchoring embossment as transformed profiled steel sheeting deformation diagrams.

Experimentally, the effects of embossment inclination angle, embossment depth and embossment quantity (anchorage length) on the concrete/profiled steel sheeting shearing resistance have been established. It was established that embossments with a 45° inclination angle to the profiled steel sheeting's longitudinal axis and a h/t=0.2 relationship, as well as end-anchors in the form of cut-flanges provides appropriate shear resistance to the concrete/profiled steel contact seam.

Material diagrams for profiled steel sheeting were transformed by incorporating the effects of concrete/profiled steel slip and the cross-sectional weakening effects of embossment which are cold-punched on the walls of profiled steel sheetings, on the ultimate strength of the slabs using the 'load - slip' test results and the profiled steel sheeting tensile test results obtained from this experimental research work.

For the first time the effects of concrete/profiled steel slip and the cross-sectional weakening effects of embossment cold-punched on the walls of profiled steel sheeting on the strength of the slabs with profiled steel sheeting as external reinforcement have been taken into consideration in the form of transformed profiled steel sheeting deformation diagrams.

1

SNiP 2.03.01-84*. "Concrete and reinforced concrete structures", Moscow, Stroiozdat, 97, 1984.

2

Lazovsky D.N., "Strength of in situ cast floor slabs with combined reinforcements", PhD thesis, Reinforced Concrete Scientific Research Institute, Moscow, 1987.

3

E. Chaparanganda, "Strength of in-situ cast floor slabs with external reinforcement", PhD thesis, Belarusian Polytechnical Academy, Minsk, 179, 1999.

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