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The paper presents an analysis of the dynamic interaction on reinforced concrete beams, caused by the outbreak of not-direct contact with the design. Depending on the distance of the source of the outbreak, the structure may be loaded with gas stream postexplosion or air shock wave. The impact of such influence on the reinforced concrete beam of a constant cross-section and small transverse dimensions compared with their length was assessed. For the beams located in the closer zone, there were evaluated the parameters of the destructive action of explosions limit case, in which the concrete chipping occurs at a length of at least the length of the buckling of steel rods. In case of loading of beams with air shock wave, using literature data, they determined the way of evaluating equivalent static load at which the boundary elastic deflection of beams occurs. The above analysis is shown by the example calculation, which sets the minimum length of the buckling of steel bars in the beam bending.[b]Keywords:[/b] civil engineering, the dynamics of the explosion, the noncontact loads, dynamic loads, reflectanc

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