Shear transfer mechanism of reinforced concrete push-off specimen using externally bonded fibre reinforced polymer (FRP) composites
The deterioration of existing reinforced concrete structures has motivate researchers all over the world to come up with a solution for an effective means of rehabilitating the structures. Nowadays, the use of composite materials for such needs has been an effective ways to overcome the problem and...
| Main Authors: | , |
|---|---|
| Format: | Thesis |
| Published: |
2009
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6883/ http://eprints.uthm.edu.my/6883/1/FRGS_0373.pdf |
| Summary: | The deterioration of existing reinforced concrete structures has motivate researchers all
over the world to come up with a solution for an effective means of rehabilitating the
structures. Nowadays, the use of composite materials for such needs has been an
effective ways to overcome the problem and the use of Fibre Reinforced Polymer (FRP)
as a strengthening and repair material is a well known method in civil engineering arena.
Extensive researches have been conducted on the shear strengthening of reinforced
concrete simply supported beams using FW composites. However, strengthening
continuous beams in shear have received very little attention among the researchers
whereas most of existing structures are in the form of continuous condition.
Furthermore, there are restraints to add shear reinforcement to an existing reinforced
concrete beams when beams are part of floor-beam system. Therefore, FRP sheets can
be seen as one suitable solution to overcome such condition. This study involves an
experimental work of five continuous beams with a size of 15Ox350x5800mm where
one beam was the control specimen, another two beams were strengthened with one
layer of CFRP strips and another two beams were strengthened with two layers of CFRP
strips. The variables were number of layer (one layer and two layers) and wrapping
scheme (four-sides wrap and three-sides wrap) of CFRP strips. Test results shows that
all beams fails in shear as expected and an increase of 24% to 55% of ultimate load for
beams strengthened with CFRP strips. The load increment of two layers of CFRP strips
were also significance which is around 20% compared with one layer of CFRP strips.
For full four-side wrap, the load increment is around 8% to 9% compared with threeside
wrap. These experimental resuIts shows that CFRP strips technique can be used to
enhance shear capacity of continuous beams. Simulation study and theoretical analysis
was also presented. |
|---|