Abstract:
Concrete structures are often subjected to
long term static and short term dynamic loads. Due to
a relatively low tensile strength and energy
dissipating characteristics, the impact resistance of
concrete is poor. Research work carried out so far
towards the development of concrete that exhibits
improved impact resistance than conventional
concrete showed that the steel fibre reinforced
concrete has a good potential as a viable structural
material for such applications. The overall objective
of the study is to investigate the dynamic behaviour of
steel fibre reinforced concrete plates under impact
loading with respect to displacement, velocity and
acceleration. In the drop weight test, eighteen plate
specimens were tested with three different thicknesses
of 20,25 and 30mm and with three different steel fibre
contents of 0.5,0.75 and 1%.The edges of the plates
were fixed on all sides. Displacement versus time,
velocity versus time and acceleration versus time
behaviour for all the plates tested were studied. It was
found that when the aspect ratio of fibres is 50 and 75
there is a marginal increase in energy absorption for
change in fibre content from 0.5 to 0.75%. There is a
steep increase in energy absorption for a steel fibre
content of 1% when the aspect ratio of fibre is 100.
