THE SHEAR STRENGTH OF REINFORCED CONCRETE BEAMS WITHOUT SHEAR REINFORCEMENT

In this article the results of experimental investigations of reinforced concrete
(RC) beams on the shear strength are presented. Tests are performed by the improved
methodology with testing every beam twice. All experiments are conducted
considering different shear span to effective depth ratio. This makes for establishing
the impact of the force application position on the carrying capacity
of reinforced concrete beams without transverse reinforcement. The result showed
the increase of carrying capacity by 8-10% while reducing the shear span to effective
depth ratio from d/a=2 to d/a=1,5 and 18-20% while ratio was d/a=1. Calculations
by the current standards in different countries showed low compliance
with experiment, which is negative for economic design. Carrying capacity calculation
method for reinforced concrete beams without shear reinforcement considering
loading accommodations as proposed and tested. This factor is not taken
into account in Ukrainian current norms of reinforced concrete structures designing.
The deviation between theoretical calculation by the proposed empirical formula
and experimental data is 10% which provides sufficient reliability of the results
for future using.

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