MECHANICAL BEHAVIOR OF REINFORCED CONCRETE BEAMS
WITH PVA SHORT FIBER SUBJECTED TO REPEATED IMPACT
32nd Our World in Concrete and Structures (OWICs) - 2007
Y. Shirane*, Maeda Corporation, Japan
M. Iwanami, Port and Airport Research Institute, Japan
H. Yokota, Port and Airport Research Institute, Japan
port structure, reinforced concrete beam, repeated impact load, falling-weight impact
loading test, PVA short fiber
It is reported that huge impulsive forces are acting repeatedly on such port
structures as breakwaters consisting of concrete caissons, resulting in ultimate
failure of concrete members. In the present design of such concrete structures,
impulsive forces are converted to equivalent simple distribution of static loads in
order to compare to the load carrying capacity of structures in static conditions.
Therefore, it is one of the problems that scatters of impulsive forces and dynamic
behavior of structures are not taken into account during the design stage.
In addition, it is necessary to examine countermeasures to improve resistance of
concrete members against repeated impact loads. In the previous study, it was
revealed that structural performance of reinforced concrete members can be
improved in static conditions by mixing PVA short fiber into concrete. Based on this,
it is expected that impact loading resistance of concrete members are improved by
PVA short fiber. Therefore, in this study, to investigate the applicability of PVA short
fiber to improve impact loading resistance of port structures, mechanical behavior of
reinforced concrete beams with PVA short fiber under repeated impact loading is
examined by conducting falling-weight impact loading tests.
As the results, it was found that the number of repetition of impact loading until
ultimate failure was greatly affected by impact velocity of 2.0 m/s and 2.5 m/s. Also, it
was made clear that the number of repetition of impact loading until ultimate failure
was increased in case of reinforced concrete beams with PVA short fiber.