PERKUATAN GESER BALOK BETON BERTULANG MENGGUNAKAN GLASS FIBER REINFORCED POLYMER (GFRP)

Abstract

In order to know the effect of GFRP plates on increasing capacity of
reinforced concrete beams, an experiment on reinforced concrete beams
strengthened by GFRP plates is made. This experiment is focused on finding the
effects of bounding GFRP plates to the side surfaces of the beams on increasing
capacity of the beams.
In this experiment the effect of adding GFRP plates having fiber directions of
00/900, ±450 and 00 to the increasing shear capacity of reinforced concrete section
was studied. The beams had section dimension of 100 cm by 150 cm and length
950 cm. The GFRP plates were added on the two side surfaces of the beams by
covering the surfaces with epoxy resin and then add glass fiber in the form of
woven roving in the direction needed and finally cover again with the epoxy. The
beams were simply supported and subjected to four points load. Data recorded
were the load-deflection at every step of loading until failure and modes of failure
of the beams. The result shows that the beams without GFRP fail in shear failure mode and the
beams with GFRP fail in flexural failure mode. More over, addition of GFRP to the
beams increases the load capacity of the beams by 12.48% averagely. The fiber
direction gives a slight difference to the increasing capacity and the amount of the
increasing capacity given by the fiber direction of 0o/90o, 0o, and ±45o are 13.744%,
11.374%, and 12.322% respectively. Theoretically the fiber direction of ±45o
should gives the highest value, but this is not happen because of de-bounding of the
GFRP plate from the surface of the beams.