Abstract
This paper presents the results of experimental investigation on concrete cylinders confined with two different types of fiber reinforced polymer (FRP) sheets, they are: synthetic high strength CFRP composites and composites using natural fiber like Jute. These two FRPs are very much distinct with respect to their strength and recycle properties. Conventional FRPs like CFRP possess superior mechanical strength than natural FRPs, but have got some serious drawbacks such as high density, high cost and poor recycling and non-biodegradable properties. On the other hand, the durability of the natural fibers can be enhanced by mummification of the fibers within the epoxy resin. An experimental study was conducted, where twenty six small scale cylindrical concrete specimens (100 × 200 mm) were subjected to uniaxial compression up o failure and the corresponding stress-strain behaviors were observed. The ultimate failure load and the deformation at peak load were the two important observations. The results demonstrate that a significant increase in the compressive strength can be achieved by confining the concrete with CFRP but both strength and ductility are compromised when concrete is wrapped with JUTE-FRP. However, JUTE-FRP shows reasonably good ductile behavior for the case of low strength concrete and can safely be used for brick masonry column. For low cost strengthening work, JUTE-FRP can be an alternative for low strength concrete and masonry works.
Highlights
IntroductionIt has been observed that buildings with relatively weak columns collapsed in a pancake fashion
In many recent earthquakes, it has been observed that buildings with relatively weak columns collapsed in a pancake fashion
T is hoop tension, σl is the lateral confining strength, ff tensile strength of fiber reinforced polymer (FRP), Ef is the modulus of FRP, εl is the lateral stain, fcc is the confining compressive strength of FRP t is the thickness of the FRP sheet and d is the diameter of the cylinder
Summary
It has been observed that buildings with relatively weak columns collapsed in a pancake fashion This is due to the presence of soft stories and due to the presence of strong beams but comparatively weaker columns (Figure 1). It is preferable to control inelasticity in columns, to the extent possible, while dissipating most of the energy through yielding of the beams as a measure against total collapse of the structure (Saatcioglu, 2010). To achieve this “weak beam strong column” objective, the columns of a building can be made more stiff against deformation by wrapping them with FRPs
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