Abstract
A fabric, tapes, that are glued to the outer tensile surface, which are considered as the external composite reinforcement with tensile steel reinforcement, are currently used to strengthen reinforced concrete beams. The results of the experimental studies presented in this article have shown the possibilities of effective application of technical polyamide (nylon) fabric produced by «Khimvolokno Plant» JSC «Grodno Azot», and glass fabrics, produced by JSC «Polotsk-Steklovolokno» for strengthening the reinforced concrete beams. Experimental studies have shown that the external reinforcing of the tensile zone with technical polyamide (nylon) fabric and fiberglass changes the beam failure mode, increases the bearing capacity of reinforced concrete beams in comparison with beams without strengthening by 16% – 38%, depending on the material and the method of strengthening.
Highlights
Reinforced concrete structures occupy a leading place in the construction industry, and with the increase in the volume of construction, the volume of work associated with the repair, restoration and strengthening of structures increases
The analysis of strengthening of reinforced concrete structures has shown that the traditional methods of strengthening associated with an increase in the cross-section dimensions, the arrangement of external elements, changes in structural schemes, etc. have exhausted themselves, since their further development will bring insignificant savings in materials
The experimental studies of reinforced concrete beams reinforced from destruction by normal cross-section were carried out to determine the most effective method and material of strengthening reinforced concrete structures
Summary
Reinforced concrete structures occupy a leading place in the construction industry, and with the increase in the volume of construction, the volume of work associated with the repair, restoration and strengthening of structures increases. The analysis of strengthening of reinforced concrete structures has shown that the traditional methods of strengthening associated with an increase in the cross-section dimensions, the arrangement of external elements, changes in structural schemes, etc. The results of modern research have shown [1–13] that it is possible to achieve greater savings in materials, reduce costs in the production of reinforcement work by using composite materials. External reinforcement of beam structures is carried out by gluing reinforcing materials to the lower stretched surface with the direction of reinforcing fibers along the axis of the structure. The most common for the restoration of reinforced concrete structures is currently a system of external reinforcement with carbon tapes. The introduction of this material is limited by the high cost
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