Acta Scientiarum Polonorum

Abstract: For reinforcement of prestressed concrete structures using reinforced thermohardened steel rebar standard length 12 m class A400, A500, A600, A800 with periodic profile. However, thermo-hardened steel rebar is essential for the production flaw – bad soldered, welded connection to that she did not meet the performance requirements for fittings in this class. Since adhesion to concrete reinforcement studied mainly experimental method because the results depend on many factors. This paper presents the design of prototypes, methods of testing and analysis of the strength of concrete beams reinforced with connected valves. Experimental research program provides four series test reinforced concrete beams crossing 120 × 220 mm length 2000 mm bend with two concentrated forces. Experimental beams were reinforced with welded frame constructions of armature 4 ∅ 8 A400 and working pre-stressed armature ∅ 12 A500C. Steel bars in reinforced concrete beams connected by crimp sleeves. To determine the characteristics of strength, deformation and crack-resisting of experimental beams they were tested for bending to destruction.