Page 19 - Open-Access-June-2020

TECHNICAL PAPER

study concluded that the infill wall with opening were more likely Fukuyama proposed a new technique for structural control
[96]
subjected to collapse due to the weakening of the confinement of RC buildings with soft story using ECC devices. In this study,
effect. The stiffness and strength of an infilled frame significantly column of soft story installed with ECC device was investigated.
increased due to the incorporation of ECC and GFRP overlay The study concluded that employing ECC devices reduces the
system. drift of first story less than half. For the base shear coefficient of
0.5, the response was effectively reduced by setting the yield
9.5 Seismic Behavior of Various Special ECC strength ratio between the device and the frame to be 0.5 or
Elements above.
Some of the exceptional elements such as dampers, precast Onizuka et al. investigated the structural performance of
[97]
balcony, etc. that are made out of ECC are also investigated ECC in case of unreinforced precast balcony. The head of the
for their structural performance. The performance of such cantilever slab was manufactured as a precast member and
ECC elements also exhibited enhanced load carrying capacity, then floor slab and guardrail part of the balcony was cast in-situ.
deformation, ductility and energy dissipation compared to The study reported that the maximum load was affected by
concrete elements. Some of the studies from literature are the thickness of the groove part and multiple cracks occurred
discussed in the following section. in the groove part. For earthquake and wind design, the entire
specimen showed better load carrying capacity. Fig. 6 shows the
Nagai et al. investigated the structural performance of RECC schematic representation of precast concrete balcony with ECC
[95]
dampers, which is used for vibration control in structures. (shaded portion at the junction).
The dampers are designed inorderin order to fail in flexure.
The study concluded that over 1/25 radian high deformation Gencturk et al. investigated the behavior of concrete and ECC
[98]
capacity, which depicts high-energy dissipation, shaped structures under simulated earthquake motion. The small-scale
relationshipbetweenrelationship between the shear force and investigations were carried out to evaluate the material- and
rotational angle. section-level parameters on the structural level. Monotonic,

Figure 6: Schematic Representation of Precast Concrete Balcony with ECC .
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20 The IndIan ConCreTe Journal | June 2020