Abstract
When operating in wet and corrosive conditions, composite reinforcement is in some cases an effective substitute for the suitable steel reinforcement. However, many questions related to its design, production and operation are insufficiently studied. The aim of the work is to create a methodology and carry out a comparative structural and mechanical analysis of strength indexes when working under load of coils and a bar of composite construction reinforcement. A method has been developed for analyzing the loading capacity of composite reinforcement according to the criteria of strength at rupture of a bar, as well as shear strength and bearing strength of its braid coils. Analytical and numerical modeling of conditions of equal strength of structural elements of composite construction reinforcement was carried out. Theoretically substantiated the assumption of a relatively low loading capacity of the braid coils in comparison with the loading capacity of the reinforcement bar. A predictive estimate of the conditions for ensuring the uniform strength of the bar for breaking and braid coils for shear and crushing by the method of lower estimation (for the minimum values of strength) has been carried out using the example of composite reinforcing bars produced by the industry of Republic of Belarus. In conclusion, results of work are formulated and it is noted that the results can be used by manufacturers and consumers of construction composite reinforcement, also in the educational process in the training of engineering personnel for the construction profile.
Highlights
Steel reinforcement traditionally used in the production of reinforced concrete has a number of disadvantages, the most important of which are low corrosion resistance, as well as the relatively high specific gravity and thermal conductivity of the metal
The widespread use of such materials is hindered by a number of factors, among which one can single out [8, 9] the lack of study of the work under load both a whole composite construction reinforcement, and its individual elements, as well as the lack of a regulatory framework for assigning mechanical characteristics, control and testing methods
Braid coils can act as an analogue of corrugations
Summary
Steel reinforcement traditionally used in the production of reinforced concrete has a number of disadvantages, the most important of which are low corrosion resistance, as well as the relatively high specific gravity and thermal conductivity of the metal. We get a rectangle with a base equal to the circumference (L = πd), on which inclined stripes are applied, characterizing the sweep of the spiral braid (Fig. 1) It can be seen from the surface sweep that the length Lc of a coil (spiral line) for a composite reinforcement bar with a core diameter d, on which the braid is wound at an angle α with a winding step H, can be determined by the following formula:. As a result of equating the coil lateral surface crushing force and the breaking force of the composite reinforcement bar we obtain the required number of bars ensuring for the condition of equal strength of the bar breaking and coils crushing: nb 4h b. Since the two-component composite volume Vk is equal to the sum of the fibers Vf and the polymer binder Vm volumes, and the volume of each component is equal to the ratio of its mass to density, to calculate the volumetric content of fibers we obtain the following formula
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