Abstract:
The strength and ductility of the concrete Abstract: can be enhanced by confinement.lt can be achieved in many ways. Using spirals is one of the ways to enhance the strength by confinement. The
confinement effect in concrete by spirals can be applicable to enhance the load carrying capacity of
columns and shear carrying capacity of beams and flat slabs. This effect prevents structures from
catastrophic failures during earthquakes. In this research study, experiments were conducted to
determine the anchorage depth of the spiral, the shear enhancement in beams due to confinement by
spirals and increment in failure load of flat slab panels a when spiral is used as a shear resistor. The
actual shear carrying capacity and theoretical shear carrying capacity of the beams were checked
using average integration method and discrete method.The experimental results indicated that the
shear carrying capacity of the beam was enhanced by 35.7% for 30mm pitch spiral, 26.8% for 45mm
pitch spiral and 16.1% for 60mm pitch spiral. The actual shear carrying capacity based on the
experimental results matched closer to the value obtained by the average integration method. The
failure load of the flat slab panel was increased by 12.3% when spiral was used as shear resistor.
Citation:
Kaneswaran, U., Reginthan, J., Perera, H.M.P., & Baskaran, K. (2011). Strength enhancement in concrete confined by spirals. In N. Ratnayake (Ed.), Proceedings of the Civil Engineering Research for Industry Symposium 2011 (pp. 43-49). Department of Civil Engineering, University of Moratuwa.
