Abstract
The steel-concrete constructions experience an increased development this last time. The main advantages are that they ensure the economy of materials, energy and labour. The steel-concrete elements allow a rational use of the concrete in the tensile zone, ensure a reduction of the weight of the building, its cost and also reduce the formwork. The calculations carried out by the authors make it possible to establish the dependence between the constraints and the deformations in the principal directions under a biaxial state of stresses, to obtain the expressions of the principal moments, determine the parameters of the deformations of the concrete Eb, Ebi, νb, νbi, obtained through the reduction of the tensile and compressive stresses of the concrete in an isotropic conventional homogeneous state. The expressions of the constraints in the plate are gotten and compared between the theoretical values and the experimental convergence of the results with a variation of less than 8%.
Highlights
It was seen that, there is significant development of external reinforcement of plates that is unification of concrete and openly-located steel plate which functions as reinforcement and jointly work together
Theoretical researches are based on the following prerequisites: simple simultaneous loading is considered; concrete is considered to be non-linearly deformed material, conventionally continuous; plate components in horizontal direction are connected by elasto-compliant bonds of shear, and in vertical direction-by absolutely rigid lateral bonds; plate height is assumed to be small in comparison with other dimensions
To check up if the calculations hold true, the results were compared with the data obtained in the test with steelconcrete plates of 50 mm thickness from the concrete of Rb = 40 MPa strength on the supporting outline of 980 × 980 mm
Summary
It was seen that, there is significant development of external reinforcement of plates that is unification of concrete and openly-located steel plate which functions as reinforcement and jointly work together. This resulted in better technical and economic characteristics of structures in terms of metal intensity used, their input in the resolution of cracks development in the tensile zone of concrete and labor input for their erection. The present article develops fundamental provisions of steel-concrete plates theory which takes into account compliance of the contact between concrete and steel plate
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