The IUP Journal of Structural Engineering
An Experimental Study on Flexural Ductility of High Strength Concrete Beams
Article Details
| Pub. Date | : Oct, 2020 |
|---|---|
| Product Name | : The IUP Journal of Structural Engineering |
| Product Type | : Article |
| Product Code | : IJSE31020 |
| Author Name | : Anusuya Senthilkumar, P N Raghunath, K Suguna |
| Availability | : YES |
| Subject/Domain | : Science and Technology |
| Download Format | : PDF Format |
| No. of Pages | : 16 |
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Abstract
The paper makes an attempt to highlight the benefits accrued through confining concrete internally and externally with the use of cellular stirrups and epoxy-bonded Glass Fiber Reinforced Polymer (GFRP) wraps. Full-scale beams of cross-section 150 250 and 3,000 mm in length were used as test specimens. The target parameters included loads and deflections at significant loading stages. The study variables comprised spacing of stirrups and the stiffness of GFRP wraps. All the beams were tested for failure under the action of two-point loading system. The deflections and cracking were observed throughout the loading spectrum. The results showed that the ductility performance improved appreciably with the inclusion of cellular stirrups and epoxy-bonded GFRP wraps.
Description
Deformation capacity of concrete members is a demand of higher order in the context of the present-day structural design. This assumes greater importance when structural members or systems are to be designed for seismic loading or any accidental impact. This requirement can be accomplished through several techniques. A promising technique is confinement. The desired degree of enhancement in ductility can be achieved by providing larger volume of transverse reinforcement or through provision of helical reinforcement or by providing externally bonded metallic or nonmetallic reinforcement. Ductility demand for normal strength concrete and High Strength Concrete (HSC) may be different. Hence, the ductility provisions for HSC members need special attention. The ductility of RC beams is largely influenced by the degree of reinforcement, concrete strength and confining pressure. It has been reported that the ductility decreases with increase in the degree of reinforcement and with increase in concrete strength. In this context, good confinement of core concrete may prove to be beneficial towards enhancing the flexural ductility. This is because the addition of confining pressure would subject the core concrete to a triaxial stress condition resulting in a more ductile behavior of the beam section. The above said practices need to be promoted on a prolific scale for a sustainable built environment.
Keywords
Ductility, Glass Fiber Reinforced Polymer (GFRP), High Strength Concrete (HSC), Internal confinement
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