STRENGTH AND DUCTILITY OF REINFORCED CONCRETE T-BEAMS STRENGTHENED IN THE NEGATIVE MOMENT REGION WITH WIRE ROPE AND MORTAR COMPOSITE
Abstract: The loss due to
collapsing structure includes not only materials but also lives. In the case of
a change in structure function that may cause increasing loads, it is required
to put efforts in strengthening the structure elements in order to increase the
capacity and hence to avoid the possibility of collapsing. The objective of
this research is to find out the behavior of T-sectional reinforced concrete
beam strengthened in the negative moment region with wire rope and mortar
composite. The test was carried out on three T-sectional beams: without wire
rope reinforcement (BK), with 2 wire rope reinforcements (BP1), and with 4 wire
rope (BP2) reinforcements. The type of wire rope was Independent Wire rope Core
(IWRC) with a 10 mm diameter. The testing method used was two points static
loading with flens positions below (the flens part experienced tensile stress).
Results showed that the maximum load carrying capacity of BP1 and BP2 specimens
increased by ratios of 1.59 and 2.03 to the BK specimen, respectively. However,
the increase was achieved after the development and propagation of high
cracking. Ductility of BP1 and BP2 specimens decreased with a ratio of 0.62 to
0.36 to the BK specimen, respectively. The initial stiffness of BP1 and BP2
increased with a ratio of 1.09 to 1.08 to the BK specimen, respectively. The
effective stiffness of BP1 and BP2 specimens decreased with a ratio of 0.88 to
0.92 to the BK specimen, respectively. Stress occurred in the wire rope based
on the analysis results of Response-2000 and the layer method did not reach 50%
of the ultimate stress resulting from the preliminary test. In general, unless
improvement was made to the stiffness characteristics of the wire rope, its
contribution would not become optimum.
Author: Y. Haryanto, I.
Satyarno, D. Sulistyo
Journal Code: jptsipilgg120058
