A STUDY ON THE SHEAR STRENGTH PROPERTY OF PLAIN CONCRETE

Abstract
Shear failures in concrete structures are very hazardous. These failures can rarely be
predicted and often happen suddenly. For years tests have been carried out on this
property.
This study involved testing plain concrete beams of variable cross-section size and three
concrete grades. Compressive strength tests were carried out as control for the shear
tests. For each grade 7 day and 28 day compressive tests were carried out. The beams
were tested for shear using a properly designed setup and these values recorded. Six
beams were tested for each grade and the results compared against the compressive test
values.
The study showed an increase in the shear strength with increase in compressive
strength and also showed an increase in shear strength with increase in effective depth.
Assuming a value of 1 for As in the formulae for design shear stress calculation in BS
8110-1:1997, design shear stress vc values were calculated and compared with the shear
strength values. A relationship was established whereby there was an increase in design
shear stress with increase in shear strength. Another parameter was the angle of shear
failure which was steeper than expected.

 

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